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Measuring method of internal flow velocity and impact force spatial distribution of viscous debris flow

A technology of spatial distribution and measurement method, which is applied in the field of impact force spatial distribution measurement and the average velocity of viscous debris flow, which can solve the problems of inability to solve the spatial distribution of velocity and the inability to measure velocity.

Active Publication Date: 2019-06-28
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method can only measure the average flow velocity of the debris flow section, and cannot measure the flow velocity at any point on any section, so it cannot solve the specific technical problems of the spatial distribution of flow velocity

Method used

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  • Measuring method of internal flow velocity and impact force spatial distribution of viscous debris flow
  • Measuring method of internal flow velocity and impact force spatial distribution of viscous debris flow
  • Measuring method of internal flow velocity and impact force spatial distribution of viscous debris flow

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Experimental program
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Effect test

Embodiment 1

[0058] Such as Figure 1 ~ Figure 3 As shown, the method of the present invention is used to measure the spatial distribution of debris flow velocity.

[0059] A debris flow ditch is a medium-sized debris flow ditch with an altitude of 1820m to 3500m and a drainage area of ​​12.2km 2 . Viscous mudslides have erupted in the ditch many times, seriously threatening the lives and property of local people. In order to reduce debris flow disasters, it is planned to build a permeable sand control dam project in the debris flow flow area, and it is necessary to calculate and measure the spatial distribution of the average velocity of debris flow.

[0060] Step S1, preliminary preparation

[0061] figure 1 It is the top view of the calculated section position (the arrow shows the movement direction of the debris flow). Set any section Ⅰ-Ⅰ on the debris flow channel, and measure the average vertical gradient of the debris flow channel at the position of section Ⅰ-Ⅰ based on topogr...

Embodiment 2

[0085] On the basis of Example 1, the spatial distribution of impact force of viscous debris flow is further measured.

[0086] Step S5, determine the debris flow impact force F at any point S δ :

[0087] Substituting each parameter into Equation 5 to calculate the impact pressure F at any point S(x, y) of debris flow in section I-I δ ,Have:

[0088]

[0089] In this embodiment, the section I-I takes a rectangular section analysis, and λ takes a value of 1.33.

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Abstract

Aiming at solving the problems that flow velocity and impact of any point in any section of mud-flow cannot be measured in the prior art, the invention first provides a method for measuring viscous mud-flow internal flow velocity and impact force spatial distributions. The method for measuring flow velocity is based on the viscous mud-flow body Bingham model and the scour-and-fill balance principle; first, setting any section I-I, determining values such as h0, h(x), xa, xd, xb, xc of the section through the trial method; then calculating the flow depth of a mud-flow calculation infinitesimal surface at any point on the section according to formula 1; and finally substituting h into the Bingham-model-based viscous mud-flow flow velocity distribution formula to obtain flow velocity of the point. By means of the method for measuring flow velocity at any position in any section of mud-flow, the method for measuring spatial distribution of viscous mud-flow impact force is further obtained. The calculation result of the method has high accuracy, which can be applied in real design for viscous mud-flow prevention and control engineering. The measurement method is clear in thinking and simple in calculating, which is an improvement of the present prevention and control engineering design method which is based on uniform distribution.

Description

technical field [0001] The invention relates to a measurement method, in particular to a method for measuring the spatial distribution of viscous debris flow average flow velocity and impact force, and belongs to the field of debris flow engineering prevention and control and the field of measurement technology. Background technique [0002] Sand control dams and other prevention and control projects are the fastest, most common and effective measures to control debris flow disasters. In this kind of engineering design, it is necessary to measure the spatial distribution of debris flow impact load as one of the most important basis for dam design parameters. [0003] The current domestic codes temporarily suggest that the load should be considered as uniform distribution in the design of debris flow control dams and other prevention and control projects, which is very different from the actual load distribution. On the one hand, the value of the uniformly distributed load i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G01P5/00G01L11/00
CPCG01L11/00G01P5/00G06F30/13G06F30/20Y02A50/00
Inventor 游勇赵海鑫柳金峰杨东旭孙昊张莉
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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