Method for measuring maximum scour depth of viscous debris flow gully bed and application thereof

A technology of debris flow ditch and scour depth, which is applied in water conservancy projects, water conservancy engineering equipment, buildings, etc., can solve the problem of poor calculation accuracy, does not consider the movement resistance of debris flow and ditches that can scour solid materials, and cannot meet the engineering foundation of viscous debris flow prevention and control The needs of buried depth design and other issues, to achieve the effect of perfect calculation theory and accurate calculation results

Active Publication Date: 2013-02-27
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the resistance of the debris flow in this calculation method only considers the shear strength of the channel accumulation body, and does not consider the movement resistance of the debris flow and the scouring solid material in the channel, so the calculation accuracy is not good; and this method is only applicable to channel accumulation The calculation of scour depth of debris flow channel under the state of material saturation is difficult to apply to the situation where the accumulated soil mass of the original debris flow channel is not saturated
These two defects make this method unable to meet the needs of foundation depth design for viscous debris flow prevention and control engineering

Method used

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  • Method for measuring maximum scour depth of viscous debris flow gully bed and application thereof
  • Method for measuring maximum scour depth of viscous debris flow gully bed and application thereof
  • Method for measuring maximum scour depth of viscous debris flow gully bed and application thereof

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Embodiment 1

[0034] Jiangjiagou is located in the north of Dongchuan City, Yunnan Province, and the water flows into the small river from east to west. Jiangjiagou drainage area is 48.6km 2, the main ditch is 13.9km long, the highest altitude is 3269m, and the lowest altitude is 1042m. It is a famous viscous debris flow ditch. From June 12 to October 3, 1983, 21 mudslides broke out in the main ditch of Jiangjiagou. The debris flow gully bed was scoured violently, resulting in the general exposure of the 1404m diversion embankment block stone armor foundation and the collapse of 694m. At present, there are few debris flow prevention and control projects in the lower reaches of Jiangjiagou, and large areas of farmland and its supporting water conservancy facilities lack effective protection, which is greatly threatened by debris flow disasters.

[0035] In order to reduce the threat of mudslide hazards and protect the farmland in the lower reaches of Jiangjiagou, it is planned to build a p...

Embodiment 2

[0043] Hongchun Ditch is located in the northeast of Yingxiu Town, Wenchuan County, on the left bank of the Minjiang River. It is a viscous debris flow ditch. Coordinates of the mouth of the ditch: N31°04′01″, E103°29′33″; Area of ​​the ditch: 5.35km 2 ; The length of the main ditch: 3.6km; the elevation of the highest point: 2168.4m; the elevation of the confluence: 880m; the relative height difference: 1288.4m; Before the Wenchuan Earthquake, two smaller debris flows occurred in Hongchungou. After the Wenchuan Earthquake, a large number of collapses and landslides were induced by the earthquake, which provided important loose materials for the formation of debris flows, and the Hongchungou debris flows tended to be active. On August 14, 2010, heavy rainfall caused a debris flow in Hongchungou, with a scale of 805,000 m 3 , of which more than 400,000 m 3 directly into the Minjiang River. The accumulation of mudslides in the Minjiang River blocked the main channel of the M...

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Abstract

The invention discloses a method for measuring the maximum scour depth of a viscous debris flow gully bed and the application thereof. The method comprises the following steps: weight Gamma1, depth h and a dynamic friction angle Beta of a viscous debris flow body, weight Gamma2, an internal frictional angle Phi and a viscosity coefficient C of cumulus deposits of an original gully bed, and vertical gradient J of the gully channel are determined by means of survey, measurement and sampling of the debris flow gully, testing of debris flow characteristic parameters and the like; and the obtained parameters are substituted into a calculation formula to obtain the maximum scour depth of the viscous debris flow gully bed. The method is applicable to the design of foundation embedded depth in a viscous debris flow prevention project, and the obtained maximum scour depth of the viscous debris flow gully bed serves as the minimum foundation embedded depth in the prevention project. Compared with the prior art, as the method is based on rigorous theory derivation, the maximum scour depth of the viscous debris flow gully bed can be reasonably determined, and references on the design of the foundation embedded depth in the prevention project are provided; and the method is high in result accuracy and can meet the requirements of the practical project.

Description

technical field [0001] The invention relates to a method for measuring and calculating the maximum scouring depth of a viscous debris flow ditch bed, and its application in the design of buried depth of prevention and control engineering foundations. Background technique [0002] Debris flow is a common geological disaster in mountainous areas of China. It has the characteristics of sudden occurrence, short duration, ferocious onset, large erosion and silting, and strong destructive power. With the further extension of human economic activities to mountainous areas and the deterioration of the natural environment, the scope and frequency of debris flow outbreaks are increasing year by year, and the harm they bring is becoming more serious. In order to ensure the sustainable development of the mountain economy, it is very important to prevent and control debris flows necessary. [0003] The viscous debris flow scours the ditch bed, causing the foundation instability of build...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/00
Inventor 游勇柳金峰赵彦波林雪平
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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