Method for calculating back-silting gradient behind debris flow silt arrester and applications

A calculation method and debris flow technology, applied in calculation, data processing applications, special data processing applications, etc., can solve the problems of inapplicability, low accuracy of silting shape measurement, poor debris flow prevention effect, etc., to achieve high accuracy and improve preventive effect, effect of avoiding failure

Active Publication Date: 2016-12-07
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The method for calculating the silting form of debris flow after the sand check dam disclosed in this patent document does not take into account the influence of the yield stress and bulk density of the debris flow on the silting slope, resulting in low accuracy in the calculation of the entire silting form, which is not suitable for large-scale field applications. calculation, it cannot provide important data reference for the sand control dam, which leads to poor effect of debris flow prevention and control

Method used

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Embodiment 1

[0036] A method for calculating the back-silting slope behind a debris flow sand retaining dam, comprising the following steps:

[0037] a. Determining the yield stress of debris flow through on-site investigation τ , unit pa, debris flow density p, unit kg / m 3 , the cumulative percentage of the debris flow smaller than the particle size is the corresponding particle size of 90% D 90 , unit m;

[0038] b. Take the yield stress τ of the debris flow, the bulk density of the debris flow ρ, and the particle size corresponding to 90% of the cumulative percentage of debris flow smaller than the particle size D 90 Substitute into Equation 1 to determine the dimensionless yield stress * ;

[0039] (Formula 1)

[0040] In formula 1, g is the acceleration of gravity, g=9.8m / s 2 ;

[0041] c. Establish a calculation model for the back-silting slope, and use the dimensionless yield stress obtained in step b * Substituting into the calculation model formula 2 of the back-sil...

Embodiment 2

[0047] A method for calculating the back-silting slope behind a debris flow sand retaining dam, comprising the following steps:

[0048] a. Determining the yield stress of debris flow through on-site investigation τ , unit pa, debris flow density p, unit kg / m 3 , the cumulative percentage of the debris flow smaller than the particle size is the corresponding particle size of 90% D 90 , unit m;

[0049] b. Take the yield stress τ of the debris flow, the bulk density of the debris flow ρ, and the particle size corresponding to 90% of the cumulative percentage of debris flow smaller than the particle size D 90 Substitute into Equation 1 to determine the dimensionless yield stress * ;

[0050] (Formula 1)

[0051] In formula 1, g is the acceleration of gravity, g=9.8m / s 2 ;

[0052] c. Establish a calculation model for the back-silting slope, and use the dimensionless yield stress obtained in step b * Substituting into the calculation model formula 2 of the back-s...

Embodiment 3

[0059] A method for calculating the back-silting slope behind a debris flow sand retaining dam, comprising the following steps:

[0060] a. Determining the yield stress of debris flow through on-site investigation τ , unit pa, debris flow density p, unit kg / m 3 , the cumulative percentage of the debris flow smaller than the particle size is the corresponding particle size of 90% D 90 , unit m;

[0061] b. Take the yield stress τ of the debris flow, the bulk density of the debris flow ρ, and the particle size corresponding to 90% of the cumulative percentage of debris flow smaller than the particle size D 90 Substitute into Equation 1 to determine the dimensionless yield stress * ;

[0062] (Formula 1)

[0063] In formula 1, g is the acceleration of gravity, g=9.8m / s 2 ;

[0064] c. Establish a calculation model for the back-silting slope, and use the dimensionless yield stress obtained in step b * Substituting into the calculation model formula 2 of the back-s...

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Abstract

The invention discloses a method for calculating back-silting gradient behind debris flow silt arrester and applications and belongs to the technical field of debris flow prevention engineering. The method comprises following steps: determining yield stress [tau] of debris flow, volume weight [rho] of debris flow, and a particle size D90 corresponding to particle sizes less than 90% of accumulative percentage composition of the debris flow; determining non-dimensional yield stress [tau]* by means of the yield stress [tau] of debris flow, the volume weight [rho] of debris flow, and the particle size D90 corresponding to particle sizes less than 90% of accumulative percentage composition of the debris flow; establishing a back-silting gradient calculating model and substituting the non-dimensional yield stress [tau]* in a back-silting gradient calculating model form 2; determining a gradient factor S and substituting the gradient factor S into a formula 3 to determine the back-silting gradient [alpha] of the back-silting gradient behind a debris flow silt arrester. The method determines the important influencing factors of the back-silting gradient by dimensional analysis, and obtains an accurate calculation model of the back-silting gradient, which can provide important data reference for the silt arrester to improve the control effect of the debris flow.

Description

technical field [0001] The invention relates to the technical field of mud-rock flow prevention and control engineering, in particular to a calculation method and application of a back-silting slope behind a mud-rock flow sand retaining dam. Background technique [0002] Debris flow refers to the landslides caused by heavy rain, snowstorm or other natural disasters in mountainous areas or other areas with deep valleys and steep terrain, carrying a large amount of sand and stones. Its area, volume, and flow are large, while landslides are small areas of diluted soil mountains. Typical debris flows are composed of viscous mud with coarse solid debris suspended and rich in silt and clay. 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 geol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/08
CPCG06F30/13G06Q50/08
Inventor 余斌胡伟
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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