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A Calculation Method of Debris Flow Bend Superelevation and Its Application

A calculation method and mud-rock flow technology, applied in water conservancy projects, water conservancy engineering equipment, buildings, etc., can solve problems affecting the prevention and control effect of mud-rock flow prevention projects, inaccurate ultra-high value of curves, etc., to prevent casualties and property losses, high The applicability of disaster prevention and the effect of good theoretical data reference

Active Publication Date: 2018-08-21
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The optimization method for the design of debris flow retaining dams disclosed in this patent document under the action of eccentric loads calculates the flow velocity lateral distribution on the cross section through the equal angular velocity ω of the debris flow passing through the bend and the peak flow Qc of the fortified debris flow. The flow velocity is used to replace the longitudinal flow velocity, which is not consistent with the actual situation. The curve superelevation value obtained for debris flow is inaccurate, and cannot effectively provide scientific data reference for the design of debris flow retaining dams, which affects the prevention and control effect of debris flow prevention and control projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for calculating the superelevation of a debris flow curve, comprising the following steps:

[0033] a. Obtain the average flow velocity V of the debris flow in previous years in the place where the debris flow occurred 0 , unit m / s, the width B of the debris flow bend in the place where the debris flow occurred in previous years 0 , unit m, super high value ΔH of the debris flow curve in the place where the debris flow occurred in previous years 0 , unit m;

[0034] b. Obtain the radius of curvature R of the debris flow where the debris flow occurred in previous years 0 , unit m;

[0035] c. Calculate and determine the dimensionless coefficient c according to formula 1;

[0036] c=ΔH 0 / B 0 (V 0 2 / R 0 g) 0.8 (Formula 1);

[0037] In formula 1, g is the acceleration of gravity, g=9.8m / s 2 ;

[0038] d. On-site measurement to obtain the average surface velocity V of debris flow, in m / s; the radius of curvature of the debris flow curve R, in m; the ...

Embodiment 2

[0044] A method for calculating the superelevation of a debris flow curve, comprising the following steps:

[0045] a. Obtain the average flow velocity V of the debris flow in previous years in the place where the debris flow occurred 0 , unit m / s, the width B of the debris flow bend in the place where the debris flow occurred in previous years 0 , unit m, super high value ΔH of the debris flow curve in the place where the debris flow occurred in previous years 0 , unit m;

[0046] b. Obtain the radius of curvature R of the debris flow where the debris flow occurred in previous years 0 , unit m;

[0047] c. Calculate and determine the dimensionless coefficient c according to formula 1;

[0048] c=ΔH 0 / B 0 (V 0 2 / R 0 g) 0.8 (Formula 1);

[0049] In formula 1, g is the acceleration of gravity, g=9.8m / s 2 ;

[0050] d. On-site measurement to obtain the average surface velocity V of debris flow, in m / s; the radius of curvature of the debris flow curve R, in m; the ...

Embodiment 3

[0057] A method for calculating the superelevation of a debris flow curve, comprising the following steps:

[0058] a. Obtain the average flow velocity V of the debris flow in previous years in the place where the debris flow occurred 0 , unit m / s, the width B of the debris flow bend in the place where the debris flow occurred in previous years 0 , unit m, super high value ΔH of the debris flow curve in the place where the debris flow occurred in previous years 0 , unit m;

[0059] b. Obtain the radius of curvature R of the debris flow where the debris flow occurred in previous years 0 , unit m;

[0060] c. Calculate and determine the dimensionless coefficient c according to formula 1;

[0061] c=ΔH 0 / B 0 (V 0 2 / R 0 g) 0.8 (Formula 1);

[0062] In formula 1, g is the acceleration of gravity, g=9.8m / s 2 ;

[0063] d. On-site measurement to obtain the average surface velocity V of debris flow, in m / s; the radius of curvature of the debris flow curve R, in m; the ...

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Abstract

The invention discloses a calculation method for debris flow bend super-elevation, and belongs to the technical field of debris flow prevention and treatment engineering. The calculation method comprises the following steps that a, the average debris flow velocity V0, the debris flow bend widths B0 and the debris flow bend super-elevation value deltaH0 for the former years in the locality where debris flow occurred are obtained; b, the debris flow bend curvature radiuses R0 for the former years in the locality where the debris flow occurred are obtained; c, the non-dimensional coefficient c is calculated according to a formula 1; d, the average debris flow surface flow velocity V, the debris flow bend curvature radius R and the debris flow bend width B are measured on site; and e, the debris flow bend super-elevation value delta H is calculated according to a formula 2. According to the calculation method for the debris flow bend super-elevation, the theory of dimensional homogeneity is followed, the obtained debris flow bend super-elevation value is more accurate, better theoretical data can be provided for debris flow preventive measures, further casualties and property loss can be effectively prevented, the calculation method for the debris flow bend super-elevation has higher disaster prevention applicability to debris flow disaster reduction, and the control effect of the debris flow is improved.

Description

technical field [0001] The invention relates to the technical field of mud-rock flow prevention engineering, in particular to a method for calculating the superelevation of a mud-rock flow curve and its application. Background technique [0002] Debris flow is a torrent formed by heavy rain and floods after saturation and dilution of soft soil mountains containing sand and rocks. Its area, volume and flow are large, while landslides are areas of small areas of diluted soil mountains. Typical debris flows are caused by suspended It is composed of viscous mud rich in silt and clay with coarse solid clastics. Under appropriate terrain conditions, a large amount of water soaks the solid accumulations in the flowing water hillside or ditch bed, reducing its stability, and the solid accumulations saturated with water move under their own gravity, forming a debris flow. Debris flow is a disastrous geological phenomenon. Mudslides usually erupt suddenly and violently, and can carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B1/00
CPCE02B1/00
Inventor 余斌李龙
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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