37results about How to "High suitability for disaster prevention" patented technology

The invention discloses a debris flow pre-warning method. In view of the shortcoming that the channel-started debris flow critical rainfall threshold calculation method in the prior art needs to be based on long-term debris flow observation data, the invention provides a debris flow pre-warning method. The core of the method is a debris flow start critical value Cr calculation method expressed by debris flow channel topography, geology, and a hydrological factor. According to the method, the Cr value of a pre-warning monitored area is used as a monitored value, and debris flow pre-warning levels are set according to the magnitudes of monitored values; when Cr is less than 0.35, the condition is green and safe; when Cr is larger than or equal to 0.35 and less than or equal to 0.47, a debris flow orange pre-warning is issued; and when Cr is larger than or equal to 0.47, a debris flow red pre-warning is issued. In optimized condition, the rainfall amount of 1h is used as a common monitored value at the same time. The invention also provides a debris flow pre-warning method with an equivalent rainfall R* value as a main monitored value. The method has a reliable principle, the threshold calculation more conforms to debris flow forming mechanism; the threshold calculation is not based on long-term observation data, and has better disaster preventing applicability.

The invention relates to a calculation method of debris flow impact force, and belongs to the field of the debris flow prevention and treatment project and the water conservancy project. The calculation method is as follows: F=0.225([Tau] / rgd1<-0.1>(d / d0)<0.05>(Em<2>V<4>)<1 / 3>sin<0.5[Theta]>). The method considers a basic theory of dimensional homogeneity for impact force calculation, is suitable for the large-scale practical calculation of the field, and exhibits higher disaster prevention applicability for the disaster prevention and reduction of the debris flow. For all impact force problems, the impact force can be obtained by calculation through parameters including the obtained mass, kinematic velocity, kinematic direction, a plane included angle with an impacted object and elasticity modulus of an impact object, the elasticity modulus of an impacted object and the like without the limitation of materials, so that the calculation method also has an application value for other impact force problems. Accuracy is verified through experiments, and the impact force which may be caused by the impact object can be accurately calculated so as to design a defensive measure according to the impact force.

The invention discloses a shallow soil landslide early-warning method in the red-bed area and belongs to the technical field of landslide prevention and control engineering. The method comprises the steps of adopting a landslide mass and a non-landslide mass in the red-bed area as a respondent, measuring a gradients alpha of the landslide mass and the non-landslide mass, an area A of the landslide mass, an upper gradient beta, an upper area Au, a transverse left gradient theta 1, a transverse right gradient theta 2, a transverse left area AL, a transverse right area AR and a terrace area A' on the landslide mass; calculating a gradient factor S, an upper-side factor U, a two-side factor C, a terrain factor T, and a rainfall factor R; calculating a critical value Cr for inducing the shallow soil landslide in the red-bed area and conducting the condition judgment; determining the landslide level, and sending an early-warning signal. According to the technical scheme of the invention, the combined effects of two factors, namely the terrain factor and the rainfall factor, are fully considered to obtain the critical value Cr for inducing the shallow soil landslide mechanism. Therefore, not only the landslide early-warning is high in accuracy, but also the early-warning reaction time is greatly shortened. Therefore, the disaster prevention applicability is improved.

The invention discloses a debris flow outbreak scale calculation method. In view of the shortcoming that the channel-started debris flow outbreak scale calculation method in the prior art needs to be based on long-term debris flow observation data, the invention provides a debris flow outbreak scale calculation method. The core of the method is a debris flow start critical value Cr calculation method expressed by debris flow channel topography, geology, and a hydrological factor, and a debris flow scale calculation method expressed by the critical value Cr. According to the method, the Cr value of a monitored area is firstly used as a monitored value, and when Cr is larger than or equal to 0.35, risk of debris flow occurrence is determined and outbreak scale is further calculated. In optimized condition, the method also uses the rainfall amount of 1h as a common monitored value to determine the risk of debris flow occurrence. The method has a reliable principle, and the threshold calculation more conforms to debris flow forming mechanism; the threshold calculation is not based on long-term observation data, and has better disaster preventing applicability.

The invention discloses a rolling stone impact force calculation method suitable for a rotation function and belongs to the field of collapse and rockfall prevention engineering technology. The method comprises the steps that a, elasticity modulus E1 and unit Pa of rolling stone and elasticity modulus E2 and unit Pa of an impacted object are obtained, and integrated elasticity modulus E and unit Pa are calculated according to the formula 1; and b, kinetic energy EK of the rolling stone, unit J, an plane included angle between the motion direction of the rolling stone and the impacted object and a unit degree are estimated, and the impact force F of the rolling stone and unit N are calculated according to the formula 2. Through the method, all impact force can be obtained through calculation according to obtained impact matter amount, motion speed, the plane included angle between the motion direction and the impacted object, the elasticity modulus, the elasticity modulus of the impacted object and other parameters without limitations of materials and the kinetic energy type of the rolling stone, and the calculation method is suitable for field large-scale actual calculation and has higher disaster prevention applicability for prevention and reduction of collapse and rockfall.

The invention discloses a method for predicting slope debris flows of a red bed area and application thereof. The method comprises the steps of (a) investigating and measuring to determine a gradientalpha of a debris flow body and a slope with no generation of debris flows and a debris flow body area A, an upper gradient beta and an upper area Au, a horizontal left side slope Theta 1, a horizontal right slope Theta2, a horizontal left side area AL, a horizontal right side area AR and the existence of a free surface, and determining an annual average rainfall R0 and a 1h rainfall variation coefficient CV of an investigation object, and measuring previous rainfall amount B in real time and stimulating a hourly rainfall I, (b) calculating and determining a prediction factor P through a formula 1 with the prediction factor P as a monitoring value, and (c) dividing a slope debris flow probability level of the red bed area according to the monitoring value. According to the method and the application, the effects and mutual influences of two factors of topography and rainfall causing the slope debris flows are fully considered, fastest warning response can be made without a large amountof historical observation data, and the disaster prevention applicability of the method and the application are improved greatly.

The invention discloses a method for calculating the maximum motion distance of ice collapse and application thereof. The method comprises the following steps: b, surveying and mapping to determine basic data of a potential ice collapse body; c, determining a main parameter elevation difference H of the maximum motion distance of ice collapse; d, starting from the foremost end of the ice collapsebody, determining the motion track of the ice collapse body during ice collapse; e, determining a plurality of measuring and calculating points along the ice collapse motion track line, and measuringthe H / L value of each measuring and calculating point; and when the motion track reaches the ice lake, the river and the reverse hillside, a measurement point is still set according to the motion track; and f, comparing the H / L values of all the calculation points, when the value of the calculation point is equal to the minimum H / L value calculated by the formula 4, determining the position of thecalculation point as the foremost edge position of ice collapse accumulation, determining the movement level distance L as the maximum movement distance of ice collapse, and determining the maximum danger range of ice collapse according to the position. According to the method, the maximum movement distance of ice collapse is accurately calculated in a quantitative mode, and the disaster prevention applicability is greatly improved.

The invention discloses a debris flow average speed calculating method and application thereof and belongs to the field of debris flow control engineering. The debris flow average speed calculating method is characterized by comprising the following steps of a, determining debris flow yield stress of tau 0 through field investigation; b, field-measuring debris flow volume weight of rho; C, field-measuring debris flow depth of h; d, calculating non-dimensionalized yield stress of tau through a formula 1; e, field-measuring debris flow surface speed of Vs; f, field-measuring bed roughness of n of debris flow movement; g, calculating debris flow average speed of Vm through a formula 2. The debris flow average speed calculating method takes into full consideration the bed roughness of debris flow movement, the depth and the properties of debris flow, eliminates size effects through non-dimensionalization, facilitates deduction to practical debris flow and has the advantages of being convenient in calculate and high in calculating accuracy. The debris flow average speed calculating method is applicable to large-dimension field practical calculation and can provide crucial reference for assessment and control of debris flow.

The invention discloses a ramp turn superelevation calculation method for a viscose debris flow, and belongs to the technical field of prevention and control engineering for viscose debris flows. The ramp turn superelevation calculation method is characterized by comprising the following steps: a. obtaining an average flow speed V0 of debris flows in a place where the debris flows occur in former years, a ramp turn width B0 of the debris flows in the place where the debris flows occur in former years, and a ramp turn superelevation value Delta H0 of the debris flows in the place where the debris flows occur in former years, calculating a determination coefficient c according to a formula 1, obtaining an average flow speed V of the debris flow, and a ramp turn width B of the debris flow through field measurement, wherein the unit of the average flow speed is m / s, and the unit of the ramp turn width is m; and substituting the coefficient c obtained in the step d into a formula 2 to determine a ramp turn superelevation value Delta H of the debris flow, wherein the unit of the ramp turn superelevation value is m. The ramp turn superelevation value of the debris flow, which is obtained by the ramp turn superelevation calculation method disclosed by the invention, is more accurate, thus a better theoretic data reference can be provided for defense measures for the debris flow, higher disaster prevention applicability is achieved for disaster reduction for the debris flow, and a prevention and control effect for the debris flow is greatly improved.

The invention discloses an early recognition method of a loess shallow landslide and belongs to the technical field of landslide prevention and control engineering. The method comprises the following steps that a, a basic terrain data including the slope of a landslide body alpha, the landslide area A, the upper trailing edge slope of the landslide body beta, the upper trailing edge area of the landslide body A<Lu> and the lower side slope of a free face gamma of the landslide body is determined according to field investigation survey; b, the upper slow factor U is calculated according to U=tan(alpha-beta)*(A<Lu> / A) ,wherein beta<alpha; c, when gamma>alpha, the landslide body has the free face, the terrain synthetic discrimination factor of the landslide body T is calculated through the formula T=tan(alpha)+1.25U; d, the risk grade of the loess shallow landslide is divided into low, medium and high three grades according to terrain synthetic discrimination factor of the landslide body T. The early recognition method of loess shallow landslide and the application can accurately classify the landslide risk in a quantitative way, and identify the early loess shallow landslide without a large amount of historical observation data of the landslide, the early warning reaction time is shortened and the disaster prevention suitability is greatly improved.

The invention discloses a shallow soil landslide early warning method based on a digital topographic map, which belongs to the field of landslide prevention and control engineering, and is characterized by comprising the following steps of: a, connecting a straight line with middle points protruding upwards along a contour line of the topographic map to serve as a middle line; b, determining an intermediate point; c, forming three point groups of plane curvature; d, taking the arithmetic mean value of the gradient as the gradient alpha of the landslide mass; e, according to a terrain DEM data distribution principle, assignments of all points in each grid are the same; f, taking an arithmetic mean value; g, calculating a topographic factor T of the potential landslide mass; h, calculating a rainfall factor R; i, calculating a shallow soil landslide early warning judgment value P; and j, performing early warning according to the shallow soil landslide early warning judgment value P. According to the method, the shallow soil landslide can be pre-warned without a large amount of historical observation data of the landslide, the dangerous landslide body is determined in advance, and the disaster prevention applicability and the pre-warning efficiency are greatly improved.

The invention discloses a debris flow pre-warning method. In view of the shortcoming that the channel-started debris flow critical rainfall threshold calculation method in the prior art needs to be based on long-term debris flow observation data, the invention provides a debris flow pre-warning method. The core of the method is a debris flow start critical value Cr calculation method expressed by debris flow channel topography, geology, and a hydrological factor. According to the method, the Cr value of a pre-warning monitored area is used as a monitored value, and debris flow pre-warning levels are set according to the magnitudes of monitored values; when Cr is less than 0.35, the condition is green and safe; when Cr is larger than or equal to 0.35 and less than or equal to 0.47, a debris flow orange pre-warning is issued; and when Cr is larger than or equal to 0.47, a debris flow red pre-warning is issued. In optimized condition, the rainfall amount of 1h is used as a common monitored value at the same time. The invention also provides a debris flow pre-warning method with an equivalent rainfall R* value as a main monitored value. The method has a reliable principle, the threshold calculation more conforms to debris flow forming mechanism; the threshold calculation is not based on long-term observation data, and has better disaster preventing applicability.

The invention discloses a method for calculating elasticity modulus of a buffer layer through uniformity of the buffer layer. The method is characterized by comprising the following steps: a, calculating to obtain soil and stone buffer layer particle diameter and particle characteristic parameters comprising soil and stone mid-value particle diameter D, soil and stone particle nonuniform coefficient Cu and soil and stone buffer layer compactness S, wherein the soil and stone mid-value particle diameter D relates to particle diameter with the weight percentage of 50 percent in soil and stone particles and the unit is mm, the stone particle nonuniform coefficient Cu is calculated through a formula 1, and the soil and stone buffer layer compactness S comprises three levels, namely a loose level, a dense level and a compact level; and b, determining the soil and stone type according to the soil and stone mid-value particle diameter D and calculating the elasticity modulus M of the soil andstone. The influence on the elasticity modulus by the uniformity of the soil and stone is taken into full consideration; and the calculation method is suitable for actual calculation of a field large-size rough stone buffer layer, is accurate and reliable in calculation result, and has higher disaster-preventing applicability on disaster prevention and reduction of collapse and rockfall.

The invention discloses a calculation method for the surge height formed by ice avalanches considering the characteristics of ice lakes, which belongs to the field of disaster prevention and control engineering in alpine mountainous areas, and is characterized in that: identifying the attributes of glaciers, calculating the thickness D of potential ice avalanche bodies; determining the ice avalanche The elevation difference H between the body and the surface of the glacial lake 0 , the distance J between the ice avalanche body and the end of the ice lake, the width b of the end of the ice lake, the slope P of the surface before the end of the ice lake, the area Ag of the ice lake, and the average water depth h of the ice lake; the average water depth h of the ice lake is calculated by formula 3; Equation 4 calculates the surge height H formed by the ice avalanche in the ice lake. The present invention establishes a more accurate ice avalanche by considering the terrain characteristics of the trailing edge of the ice lake, the morphological characteristics of the ice lake, the volume of the ice avalanche body, the height difference between the ice avalanche body and the ice lake, and the positional relationship between the ice avalanche body and the ice lake. The swell calculation formula formed in the glacial lake provides a scientific and reasonable basis for judging whether the glacial lake has collapsed.

The invention discloses a method for calculating elasticity modulus of a buffer layer according to the density of the buffer layer. The method is characterized by comprising the following steps that a, earth and stone buffer layer granule characteristic parameters including earth and stone median size D, an earth and stone granule nonuniform coefficient Cu and earth and stone compactness S are measured and calculated, wherein the earth and stone granule nonuniform coefficient Cu is calculated through a formula 1 and includes three levels including uniform level, basic uniform level and nonuniform level, and the levels of the earth and stone granule nonuniform coefficient Cu are calculated through the formula 1; b, the earth and stone compactness S is calculated through a formula 2; c, theearth and stone elasticity modulus M is calculated according to the earth and stone compactness S. The calculating method fully gives consideration to the influence of specific density on the elasticity modulus, is suitable for actual calculation of wild large-sized coarse and large stone block buffer layers, make calculation results accurate and reliable and has better disaster prevention applicability for prevention and decrease of collapse and falling stones.

The invention discloses a shallow soil landslide early-warning method in the red-bed area and belongs to the technical field of landslide prevention and control engineering. The method comprises the steps of adopting a landslide mass and a non-landslide mass in the red-bed area as a respondent, measuring a gradients alpha of the landslide mass and the non-landslide mass, an area A of the landslide mass, an upper gradient beta, an upper area Au, a transverse left gradient theta 1, a transverse right gradient theta 2, a transverse left area AL, a transverse right area AR and a terrace area A' on the landslide mass; calculating a gradient factor S, an upper-side factor U, a two-side factor C, a terrain factor T, and a rainfall factor R; calculating a critical value Cr for inducing the shallow soil landslide in the red-bed area and conducting the condition judgment; determining the landslide level, and sending an early-warning signal. According to the technical scheme of the invention, the combined effects of two factors, namely the terrain factor and the rainfall factor, are fully considered to obtain the critical value Cr for inducing the shallow soil landslide mechanism. Therefore, not only the landslide early-warning is high in accuracy, but also the early-warning reaction time is greatly shortened. Therefore, the disaster prevention applicability is improved.

The invention relates to a debris flow maximum curve ultrahigh position calculating method and application and belongs to the technical field of debris flow prevention and control engineering. The method comprises the steps that a, the average debris flow velocity V of a debris flow locality is obtained, and the debris flow channel width B of the debris flow locality is measured on site; b, the debris flow curve center curvature radius R of the debris flow locality is measured on site; c, the debris flow yield stress tau is measured on site; d, the debris flow density rho is measured; the debris flow curve maximum ultrahigh position theta is calculated according to the formula 1. The method and application follow the theory of dimensional homogeneity, can provide a model which can accurately calculate the maximum curve ultrahigh position of the debris flow in different curves and at different speeds, can provide better theoretical data reference for debris flow defensive measures, accordingly can effectively prevent personal casualty and property loss, has higher disaster prevention applicability for disaster reduction of the debris flow and greatly improves the prevention and control effect of the debris flow.

The invention relates to a calculation method of debris flow impact force, and belongs to the field of the debris flow prevention and treatment project and the water conservancy project. The calculation method is as follows: F=0.225([Tau] / rgd1<-0.1>(d / d0)<0.05>(Em<2>V<4>)<1 / 3>sin<0.5[Theta]>). The method considers a basic theory of dimensional homogeneity for impact force calculation, is suitable for the large-scale practical calculation of the field, and exhibits higher disaster prevention applicability for the disaster prevention and reduction of the debris flow. For all impact force problems, the impact force can be obtained by calculation through parameters including the obtained mass, kinematic velocity, kinematic direction, a plane included angle with an impacted object and elasticity modulus of an impact object, the elasticity modulus of an impacted object and the like without the limitation of materials, so that the calculation method also has an application value for other impact force problems. Accuracy is verified through experiments, and the impact force which may be caused by the impact object can be accurately calculated so as to design a defensive measure according to the impact force.

The invention discloses a debris flow equilibrium slope calculation method and an application thereof, belonging to the technical field of debris flow control works. The method comprises the following steps: measuring the yield stress tau with unit pa through field investigation; determining the debris flow volume weight p with unit kg / m<3> through an outdoor volume weight test, and measuring the debris flow depth h with unit m through field investigation; substituting the yield stress tau, the debris flow volume weight p and the debris flow depth h in the step (a) into a formula tau<*>=tau / pgh to determine the yield stress tau<*> of nondimensionalization; substituting the yield stress tau<*> of nondimensionalization obtained in the step (b) into a formula S=3.0887tau<*1.3724> to determine the slope S of nondimensionalization; and finally, substituting the slope S of nondimensionalization obtained in the step (c) into a formula S=tana to obtain the equilibrium slope. In the invention, the size effect is eliminated through nondimensionalization, the deduction into actual debris flow is facilitated, a theoretical basis is provided for the design of debris flow disaster control works, and the disaster prevention applicability is improved.

The invention discloses a red-bed region rock landslide prewarning method and application thereof, and belongs to the technical field of landslide prevention engineering. The prewarning method comprises the following steps: (a) a slope alpha of a landslide mass, an area A of the landslide mass, an upper side area Au of the landslide mass and an upper side surface slope beta of the landslide mass are determined through field surveying and mapping; (b) the rainfall is monitored to obtain the rainfall time and the average rainfall intensity; (c) landslide prewarning judging factors P are calculated according to a formula 1 by terrain factors and rainfall factors; and (d) the rock landslide prewarning grades are divided by the landslide prewarning judging factors P; when P is not lower than 1.85, the possibility is high; when P is not lower than 1.45 and lower than 1.85, the possibility is medium; and when P is lower than 1.45, the possibility is low. The prewarning method deeply researches the terrain conditions and the rainfall conditions formed by the rock landslide, builds precise prewarning calculation models of the rock landslide, determines the prewarning grade of the rock landslide, and greatly improves the prewarning accuracy and applicability.

The invention discloses a method for calculating minimum buffer layer thickness, which is characterized by comprising the following steps: a, measuring and calculating to obtain an earth-stone mediumdiameter D, an earth-stone particle non-uniformity coefficient Cu and earth-stone buffer layer compactness S; b, calculating the earth-stone buffer layer compactness S; c, calculating the elastic modulus M of the earth-stone buffer layer according to the characteristic parameters of the earth and stone; d, measuring and calculating to obtain an elastic modulus M1 of an impact object, and calculating a comprehensive elastic modulus E; e, estimating the kinetic energy Ek and an impact clamp theta of the impact object and calculating the impact force F acting on the earth-stone buffer layer; andf, calculating the minimum thickness H of the earth-stone buffer layer according to the impact force F and the elastic modulus M of the earth-stone buffer layer. The method for calculating minimum buffer layer thickness in the invention fully considers the limit value of the minimum thickness of the earth-stone buffer layer, which can not only effectively avoid a protection failure caused by beingsmaller than the limit value, but also reduces the waste of engineering and cost caused by being greater than the limit value, thereby greatly improving the applicability of disaster prevention and mitigation.

A Calculation method of maximum horizontal movement distance of debris flow in rock landslide relates to the technical field of geological disaster prevention and early war. The maximum horizontal motion distance of rock landslide debris flow is calculated and applied to rock landslide debris flow. The method Comprises the steps of obtaining parameters and calculating, and obtaining the landslideby surveying the parameters of the potential rock landslide body. The volume V of the detrital flow, The falling height H of the clastic mass predicts the disintegration degree of the rock mass afterits instability, predicts the maximum block diameter d, predicts the movement track after its instability, predicts the width B of the sliding section and the slope alfa, substitutes the obtained parameters into the formula for calculating the maximum horizontal movement distance, and thus measures and calculates the maximum movement distance of the clastic flow of the landslide. Establish a moreprecise slope. The calculation method of maximum movement distance of debris flow can be used to predict the dangerous range of landslide debris flow, which greatly improves the applicability of disaster prevention.

The invention discloses a ramp turn superelevation calculation method for a viscose debris flow, and belongs to the technical field of prevention and control engineering for viscose debris flows. The ramp turn superelevation calculation method is characterized by comprising the following steps: a. obtaining an average flow speed V0 of debris flows in a place where the debris flows occur in former years, a ramp turn width B0 of the debris flows in the place where the debris flows occur in former years, and a ramp turn superelevation value Delta H0 of the debris flows in the place where the debris flows occur in former years, calculating a determination coefficient c according to a formula 1, obtaining an average flow speed V of the debris flow, and a ramp turn width B of the debris flow through field measurement, wherein the unit of the average flow speed is m / s, and the unit of the ramp turn width is m; and substituting the coefficient c obtained in the step d into a formula 2 to determine a ramp turn superelevation value Delta H of the debris flow, wherein the unit of the ramp turn superelevation value is m. The ramp turn superelevation value of the debris flow, which is obtained by the ramp turn superelevation calculation method disclosed by the invention, is more accurate, thus a better theoretic data reference can be provided for defense measures for the debris flow, higher disaster prevention applicability is achieved for disaster reduction for the debris flow, and a prevention and control effect for the debris flow is greatly improved.

The invention discloses a debris flow average speed calculating method and application thereof and belongs to the field of debris flow control engineering. The debris flow average speed calculating method is characterized by comprising the following steps of a, determining debris flow yield stress of tau 0 through field investigation; b, field-measuring debris flow volume weight of rho; C, field-measuring debris flow depth of h; d, calculating non-dimensionalized yield stress of tau through a formula 1; e, field-measuring debris flow surface speed of Vs; f, field-measuring bed roughness of n of debris flow movement; g, calculating debris flow average speed of Vm through a formula 2. The debris flow average speed calculating method takes into full consideration the bed roughness of debris flow movement, the depth and the properties of debris flow, eliminates size effects through non-dimensionalization, facilitates deduction to practical debris flow and has the advantages of being convenient in calculate and high in calculating accuracy. The debris flow average speed calculating method is applicable to large-dimension field practical calculation and can provide crucial reference for assessment and control of debris flow.

The invention relates to a method for calculating the impact force of rolling stones, belonging to the fields of collapse, rockfall prevention and control engineering and water conservancy engineering. The impact calculation method of rolling stone of the present invention, comprises the following steps: (1) obtain rolling stone elastic modulus E1, the elastic modulus E2 of impacted object, calculate comprehensive elastic modulus E; (2) estimate rolling stone quality m, rolling stone The moving speed V, the angle θ between the moving direction of the rolling stone and the plane of the impacted object, calculate the impact force F of the rolling stone according to the formula F=0.261(Em2V4)1 / 3sin0.5θ. The present invention considers the basic principle of dimension harmony for the calculation of impact force, so the calculation method is suitable for large-scale actual calculation in the field, and has higher applicability for disaster prevention and mitigation of landslides and falling rocks.

The invention discloses a calculation method for elastic modulus of a buffer layer. The calculation method is characterized by comprising the following steps: a, earth-rock buffer layer particle characteristic parameters, including earth-rock median diameter D, earth-rock particle nonuniform coefficient Cu and earth-rock buffer layer compactness S, are obtained by calculation, wherein the earth-rock median diameter D refers to particle diameter with weight percentage of 50% in the earth-rock particles, and the unit is mm; the earth-rock particle nonuniform coefficient Cu is calculated by Formula 1; b, the earth-rock type is determined according to the earth-rock median diameter D, and the earth-rock elastic modulus M is calculated. The influence of the specific particle size value of earth-rock on the elastic modulus is fully considered, the calculation method is suitable for actual large-scale calculation of large thick stone buffer layers in the field, the calculation result is accurate and reliable, and the method has higher disaster prevention applicability for preventing and reducing disaster such as collapse and rockfall.

The invention discloses a method for calculating the elastic modulus of a buffer layer, which is characterized in that it comprises the following steps: a. Measure and obtain the characteristic parameters of the soil-rock buffer layer particles, including the soil-rock median particle diameter D, the soil-rock particle unevenness coefficient Cu, and the soil-rock buffer Layer compactness S, soil-rock median particle size D refers to the particle size of 50% of the weight percentage of soil-rock particles, unit mm; soil-rock particle unevenness coefficient Cu is calculated by formula 1; b. Determine soil-rock according to soil-rock median particle size D Type, calculate the elastic modulus M of soil and rock. The invention fully considers the influence of the specific particle size of soil and rock on the elastic modulus, and the calculation method is suitable for the actual calculation of the large-scale buffer layer of coarse rocks in the field. High suitability for disaster prevention.

The invention discloses an early recognition method for shallow soil landslide, which belongs to the technical field of landslide prevention and control engineering, and is characterized by comprising the following steps of S1, determining a slope with a sunken cross section according to contour lines of a topographic map through topographic DEM data, S2, taking the arithmetic mean value of the gradients of all the middle points as the gradient alpha of the landslide mass, wherein according to a topographic DEM data distribution principle, assignments of all points in each grid are the same, S3, calculating the plane curvature of the middle point of each potential landslide mass through a three-point method, and taking an arithmetic mean value to obtain the plane curvature Q of the potential landslide mass, S4, calculating a topographic factor T of the potential landslide mass, and S5, conducting early recognition of the shallow soil landslide according to the slope alpha of the landslide mass, the plane curvature Q of the potential landslide mass and the topographic factor T. According to the method, the shallow soil landslide is accurately determined and identified in a quantitative manner, the early recognition efficiency of the landslide is improved, and the disaster prevention effect is improved.