Calculation method of impact force of debris flow

A calculation method and technology of debris flow, applied in the field of water conservancy projects and debris flow prevention and control engineering, can solve the problems of dimension disharmony, calculation complexity, etc., and achieve the effect of high disaster prevention applicability

Inactive Publication Date: 2019-01-29
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of complex calculation, disharmonious dimensions and large errors in the existing calculation method for the impact force of debris flow boulders, the present invention provides a calculation method for the impact force of debris flow with harmonious dimensions and more accurate calculation results

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] On July 9, 1982, the huge rocks in the debris flow cut off the bridge pier in the middle of the Lizi Yidagou Bridge on Chengdu-Kunming Railway. The plane angle of the impacting object is 90°, and the modulus of elasticity is 49×10 9 Pa, the modulus of elasticity of the impacted object 26×10 9 Pa.

[0025] Through data query, it is found that the debris flow in Liziyidagou is a viscous debris flow, and its bulk density is 2350kg / m 3 , the yield stress is 8000Pa, and the suspended particle size is 0.5m. According to the formula (1), the impact force of the debris flow is 2909 tons, and the data shows that the breaking force of the bridge pier is 1200 tons, so such a large impact force destroys the The bridge piers are no surprise either.

Embodiment 2

[0027] In June 1983, in Dadegou, Dongchuan City, Yunnan Province, two steel pipes welded together by rocks in a debris flow were bent but not broken. The breaking strength of the steel pipe was 2860 tons. According to the site survey, it was estimated separately. The relevant parameters are: the mass of the impacting object is 23060kg, the moving speed is 12m / s, the angle between the moving direction and the plane of the impacted object is 90°, and the elastic modulus is 42×10 9 Pa, the modulus of elasticity of the impacted object 21×10 9 Pa.

[0028] According to the data, it is found that the debris flow in Dade Valley is a viscous debris flow, and its bulk density is 2000kg / m 3 , the yield stress is 8000Pa, and the suspended particle size is 0.3m. According to the formula (3), the impact force of the debris flow is 2647 tons, which is less than the breaking strength of the steel pipe, so it is only bent and not broken.

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Abstract

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.

Description

technical field [0001] The invention relates to a calculation method for the impact force of mud-rock flow, belonging to the fields of mud-rock flow prevention and control engineering and water conservancy engineering. Background technique [0002] my country is one of the most serious countries in the world suffering from debris flow, especially in western regions such as Tibet, Sichuan, Gansu, Xinjiang, Yunnan, Chongqing and other places. The impact of debris flow will release a large amount of material and huge energy accumulated in the early stage in an instant, which has great impact and destructive power. Where the debris flow goes, roads, bridges, railways and other transportation facilities are often washed away and buried, and fertile land is destroyed. Washed away, rivers are blocked, so it is a common and extremely destructive disaster type in mountainous areas, which seriously threatens the structural safety of roadbeds, bridges, and culverts in mountainous areas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG16Z99/00
Inventor 余斌易伟
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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