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Comprehensive Judgment Method for Blocking Criticality of Viscous Debris Flow Retained by Lattice Dam

A comprehensive judgment and debris flow technology, applied in construction, water conservancy engineering equipment, water conservancy engineering, etc., can solve the problems of not considering the influence of dam body occlusion, the inapplicability of grid dam occlusion, and less research on viscous debris flow occlusion, etc.

Active Publication Date: 2020-05-05
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

This method is only for the window dam type, and its criterion only considers the influence of the opening parameters of the dam body on the occlusion, and does not consider the influence of the nature of the debris flow and the vertical slope of the channel on the dam body occlusion; the public number is CN 106096216A, and the public date is The Chinese invention patent on November 9, 2016 discloses a method for judging the occlusion performance of a beam-type grid dam and its application
This method is only for the beam-grid dam type, and its criterion does not consider the influence of channel longitudinal slope on occlusion
In the existing technologies represented by these two patents, the criterion formula is mainly used to judge the occlusion type of the window dam and the beam-type grille dam, which is not applicable to the occlusion of the lattice dam; while foreign countries mainly study the blockage of the lattice dam. flow, there are few studies on the occlusion of viscous debris flow in my country

Method used

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  • Comprehensive Judgment Method for Blocking Criticality of Viscous Debris Flow Retained by Lattice Dam
  • Comprehensive Judgment Method for Blocking Criticality of Viscous Debris Flow Retained by Lattice Dam
  • Comprehensive Judgment Method for Blocking Criticality of Viscous Debris Flow Retained by Lattice Dam

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Effect test

Embodiment 1

[0024] A debris flow ditch is located in the north of Nianjia Village, Jiaogong Town, Wudu District, Longnan, Bailong River Basin, with a drainage area of ​​2.54km 2 , the length of the main ditch is 1.71km, the relative height difference is 1451m, and the longitudinal slope gradient of the ditch bed is 22%. Landslides and collapses are developed in the watershed, and there are abundant slope deposits and debris flow accumulations. The sills in the gullies are developed and the rocks are distributed. Debris flows are prone to eruption, which seriously threatens the villagers, houses and farmland living in the debris flow accumulation fan, and directly threatens the population up to 1,180 people, property of about 80 million yuan, the degree of harm is great.

[0025] Through field investigation, it is determined that the bulk density of the debris flow is 19.3kN / m 3 ; On-site sampling, analysis of debris flow full particle size grading curve (such as figure 2 Shown), get th...

Embodiment 2

[0028] A debris flow ditch is located on the north side of Houba Village, Liangshui Town, Wudu District, Longnan, Bailong River Basin, with a drainage area of ​​11.56km 2 , the length of the main ditch is 5.97km, the relative height difference is 998m, and the longitudinal slope gradient of the ditch bed is 17%. The rock joints in the watershed are well developed, the soil is loose and broken, and slumps and collapses are very developed. The branch ditches on both sides are strongly cut, which is very conducive to the rapid collection of rainfall, and it is very easy to break out of debris flow, which seriously threatens the life, property and 212 of the residents at the mouth of the valley. National Highway Traffic Safety.

[0029] Through field investigation, it is determined that the bulk density of the debris flow is 20.5kN / m 3 ; On-site sampling, analysis of debris flow full particle size grading curve (such as figure 2 Shown), get the characteristic particle size d 9...

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Abstract

The invention provides a critical comprehensive judging method for occlusion of a viscous debris flow intercepted by a lattice dam. The critical comprehensive judging method includes the steps that volume weight gamma c of a debris flow is determined through a field research and the unit is kN / m3, and a full grain size glass distribution curve of the debris flow is determined to obtain a value ofcharacteristic particle size d95 and the unit is m; a longitudinal slope tan theta of a raceway groove is measured on site, an actually measured or designed opening spacing b of the lattice dam is selected, and the unit is m; critical comprehensive criteria F for the lattice dam occlusion is radically calculated; if F is less than or equal to 0.99, the lattice dam is determined to be a fully-occlusion type; if F is more than 0.99 and less than or equal to 2.92, the lattice dam is determined to be a semi-occlusion type; and if F is more than 2.92, the lattice dam is determined to be a non-occlusion type. According to the critical comprehensive judging method for the occlusion of the viscous debris flow intercepted by the lattice dam, the influence of multiple factors is taken into consideration, dimensionless parameters such as volume concentration, relative openness, and the longitudinal slope of the raceway groove are selected to eliminate the size effect, and a critical comprehensivecriterion formula for lattice dam occlusion is provided combined with experimental data of indoor water trough models, so that a basis for the rational determination of the lattice dam occlusion andthe lattice dam opening spacing design can be provided, and the basis for the practical engineering application can be further provided.

Description

technical field [0001] The invention relates to the technical field of debris flow prevention and control engineering, in particular to a method for comprehensively judging the occlusion criticality of a lattice dam blocking viscous debris flow. Background technique [0002] Debris flow engineering measures are the most effective means of prevention and control of debris flow, which include valley squares, sand dams, drainage channels, aqueducts, open tunnels, etc., among which sand dams are the most commonly used engineering measures. According to the structural form, sand check dams can be divided into two categories: solid sand check dams and permeable sand check dams. The permeable sand check dam has excellent drainage performance and can separate debris fluid from soil and water in a short period of time. In addition, during non-debris flow outbreaks, part of the mud and sand inside the sand check dam can be carried by the water flow through the gaps in the dam body, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B1/00
CPCE02B1/00
Inventor 柳金峰袁东游勇周文兵焦亮
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI