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Design method for width of slit of single-slit dam for preventing and treating debris flow with driftwood

A design method and technology of debris flow, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the blockage of the incision, without considering the impact of driftwood on the debris flow flow of the single-incision dam, and the single-incision dam loses the effect of debris flow prevention and control. and other problems, to achieve the effects of easy access, simple and effective design methods, and prevention of secondary disasters

Inactive Publication Date: 2017-09-05
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when using a single notch dam to prevent and control drift wood debris flow, the design of the notch width is very important; if the notch width is too large, the function of the single notch dam cannot be effectively played; if the design is too small, the single notch cannot be effectively used The function of the dam row may easily lead to the blockage of the driftwood on the incision, and then the single-notch dam will lose its prevention and control effect on debris flow
However, at present, when designing the incision width of single-notch dams, it is mostly based on design experience, without considering the blocking effect of driftwood on single-notch dams and the impact of blockage on debris flow flow

Method used

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  • Design method for width of slit of single-slit dam for preventing and treating debris flow with driftwood
  • Design method for width of slit of single-slit dam for preventing and treating debris flow with driftwood
  • Design method for width of slit of single-slit dam for preventing and treating debris flow with driftwood

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Embodiment 1

[0027] Such as figure 1 shown. A debris flow ditch in Luding has experienced frequent activities in recent years. The downstream is the Dadu River Basin, and the vegetation coverage in the upper reaches of the ditch is relatively high. Basin area 3.9km 2 , the length of the main ditch is 2.13km, and the average vertical gradient is 190‰. During the investigation of the debris flow ditch, it was found that the upstream of the ditch and the debris flow flow area contained a large number of driftwood, and the driftwood size was large, which may cause serious blockage effects on the prevention and control works , resulting in an instantaneous increase in the flow of debris flow, blocking the Dadu River.

[0028] In order to effectively control the mud-rock flow, make the sources in the mud-rock flow ditch flow smoothly into the Dadu River without blocking the river, reduce the hazards of the mud-rock flow, and protect the infrastructure and the safety of residents' lives and pro...

Embodiment 2

[0035] Such as figure 1 shown. A debris flow ditch in Tibet is a relatively large-scale debris flow ditch with frequent activities. The vegetation coverage rate in the upstream of the ditch is as high as 90%, and the drainage area of ​​the ditch is about 4.50km 2 , the length of the main ditch is 2.70km, and the average vertical gradient is 270‰. The debris flow survey of the ditch found that due to human deforestation and natural factors, there were a large number of trees scattered in the middle and upper reaches of the ditch, and the driftwood was large in size. Considering that a large number of driftwood may block the downstream prevention and control works and affect the safety of the downstream infrastructure of the trench.

[0036] In order to effectively control the driftwood debris flow in the ditch and prevent the potential threat of loss of downstream facilities due to the increase in debris flow caused by driftwood blockage, a single-cut dam is proposed to be b...

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Abstract

The invention discloses a design method for the width of a slit of a single-slit dam for preventing and treating a debris flow with driftwood. The single-slit dam comprises a dam body foundation and a dam boy main body, wherein the dam body main body is provided with the slit which is along the flow direction of the debris flow and halves the dam body main body. The design method for the width of the slit comprises the following steps of firstly determining the average length of the driftwood, the average diameter of the driftwood, the volume ratio which is accounted for by a solid matter in a debris flow body, the total amount of the debris flow and the total amount of the driftwood, and afterwards, calculating to obtain the width of the slit of the single-slit dam through a calculation formula for the width of the slit. According to the method, the blockage burst effect of the driftwood on the single-slit dam is sufficiently considered; a relation among the seven of the driftwood on the blockage burst of the slit, the width of the slit, the average length of the driftwood, the average diameter of the driftwood, the total amount of the driftwood, the total amount of the debris flow and the volume ratio which the solid matter accounts in the debris flow body is comprehensively considered; a blockage burst discrimination index is combined on the basis; the width of the slit of the single-slit dam in different conditions of the debris flow with the driftwood can be reasonably determined; further, the design method is simple, convenient and effective.

Description

technical field [0001] The invention relates to a mud-rock flow prevention technology, in particular to a method for designing the incision width of a single-cut dam for preventing and controlling drift wood mud-rock flow. Background technique [0002] In the middle and high altitude mountainous areas of our country, the vegetation coverage is high. Due to factors such as fires, earthquakes, and landslides in recent years, a large number of tree branches are scattered in the debris flow formation area or the vast forest area. When a debris flow occurs, these trees enter the debris flow and form driftwood. , slanting out with the debris flow, forming driftwood debris flow, these driftwood has a strong impact and destructive force, and is likely to cause more serious disasters and losses. [0003] In the prevention and control of debris flow, the single-cut dam is a new type of dam body. There is a cut in the middle of the dam body and the dam body is divided into two parts. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 王道正陈晓清赵万玉陈剑刚胡凯王飞
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI