Method for calculating debris flow channel erosion amount

A calculation method and technology of debris flow, applied in the direction of calculation, special data processing applications, instruments, etc., can solve problems such as unpredictability, lack of mechanical mechanism analysis, and difficulty in quantitatively describing the erosion process, and achieve high reliability.

Inactive Publication Date: 2017-07-21
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technologies represented by this patent document all have the defect of lack of mechanical mechanism analysis, and it is difficult to quantitatively describe the development of the erosion process such a

Method used

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  • Method for calculating debris flow channel erosion amount
  • Method for calculating debris flow channel erosion amount
  • Method for calculating debris flow channel erosion amount

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A calculation method for the amount of erosion in a debris flow channel, comprising the following steps:

[0032] a. Collect and obtain the debris flow flow Q, measure the debris flow channel width B and the average velocity V of the debris flow m , and then according to the formula Get the flow depth h of the debris flow D ;

[0033] b. Obtain the average water infiltration velocity v according to the field water injection test i and soil seepage coefficient K * , and then according to the calculation formula of the wetting front The calculated wetting front Z of the trench bed f , where v i >K * ;

[0034] c. According to the Voellmy model, consider the joint action of particle friction, collision and slurry, collect the required parameters, according to the formula Calculate the flow shear stress τ on the surface of the trench bed by the debris flow d ;

[0035] In the formula, ξ is the debris flow turbulence coefficient, unit m / s 2 , V m is the avera...

Embodiment 2

[0043] A calculation method for the amount of erosion in a debris flow channel, comprising the following steps:

[0044] a. Collect and obtain the debris flow flow Q, measure the debris flow channel width B and the average velocity V of the debris flow m , and then according to the formula Get the flow depth h of the debris flow D ;

[0045] b. Obtain the average water infiltration velocity v according to the field water injection test i and soil seepage coefficient K * , and then according to the calculation formula of the wetting front The calculated wetting front Z of the trench bed f , where v i >K * ;

[0046] c. According to the Voellmy model, consider the joint action of particle friction, collision and slurry, collect the required parameters, according to the formula Calculate the flow shear stress τ on the surface of the trench bed by the debris flow d ;

[0047] In the formula, ξ is the debris flow turbulence coefficient, unit m / s 2 , V m is the avera...

Embodiment 3

[0055] A calculation method for the amount of erosion in a debris flow channel, comprising the following steps:

[0056] a. Collect and obtain the debris flow flow Q, measure the debris flow channel width B and the average velocity V of the debris flow m , and then according to the formula Get the flow depth h of the debris flow D ;

[0057] b. Obtain the average water infiltration velocity v according to the field water injection test i and soil seepage coefficient K * , and then according to the calculation formula of the wetting front The calculated wetting front Z of the trench bed f , where v i >K * ;

[0058] c. According to the Voellmy model, consider the joint action of particle friction, collision and slurry, collect the required parameters, according to the formula Calculate the flow shear stress τ on the surface of the trench bed by the debris flow d ;

[0059] In the formula, ξ is the debris flow turbulence coefficient, unit m / s 2 , V m is the average...

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Abstract

The invention discloses a method for calculating the debris flow channel erosion amount. The method includes the following steps that a, the flow depth hD of debris flow is obtained; b, the wetting front Zf of a ditch bed is obtained through calculation; c, the flow shear stress td of the debris flow on the surface of the ditch bed is obtained through calculation; d, the normal stress delta sigma, the tangential shear stress delta t, the normal stress sigma bot of a ditch bed matrix of the dsc position below the surface of the ditch bed and the tangential shear stress t bot are calculated; e, driving force generated after the ditch bed matrix suffers from flow of the debris flow and the dead weight static pressure and shear strength generated due to lateral horizontal stress of rock and earth mass on the two sides are calculated; f, shear strength generated by the comprehensive effect of normal stress and pore water pressure of the soil mass is calculated; g, the debris flow ditch bed is divided into multiple sections according to the gradient and the valley width, and ditch bed erosion depth is integrated along the length of the ditch bed. Physical process features such as the erosion depth can be predicted, reference is provided for design of the prevention and treatment engineering foundation embedded depth, and the method meets actual engineering requirements.

Description

technical field [0001] The invention relates to the technical field of geological disaster prevention and control engineering, in particular to a calculation method for the erosion amount of a debris flow channel. Background technique [0002] Debris flow, as a two-phase fluid between water flow and debris flow, acts quickly and strongly on mountainous areas due to its fast velocity, strong impact, and sudden outbreak. The main manifestations will seriously endanger the safety of residents, towns, transportation, water conservancy, and electric facilities in the disaster area for a long period of time in the future, and it is one of the important restrictive factors affecting post-disaster recovery and reconstruction. All pose a great threat. [0003] Debris flow channel erosion, as a main erosion mechanism, is due to the loose material in the channel under the action of fluid at a certain depth. Once the driving force of the fluid on the solid particles is greater than its...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 唐川黄勋李宁周伟朱静常鸣李为乐
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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