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Design method and use of transversal dentated sill embedded depth of foundation based on debris flow soft foundation energy dissipating

A design method, the technology of horizontal sills, applied in the field of debris flow anti-scouring, can solve problems such as calculation methods without theoretical basis

Inactive Publication Date: 2009-06-24
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

The foundation depth of the existing transverse sills is designed based on experience, and there is no relatively perfect calculation method with theoretical basis

Method used

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  • Design method and use of transversal dentated sill embedded depth of foundation based on debris flow soft foundation energy dissipating
  • Design method and use of transversal dentated sill embedded depth of foundation based on debris flow soft foundation energy dissipating
  • Design method and use of transversal dentated sill embedded depth of foundation based on debris flow soft foundation energy dissipating

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Experimental program
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Effect test

Embodiment 1

[0059] According to a large number of data statistics, for dilute-transitional debris flow, its bulk density is generally 15.0-18.0kN / m 3 , the proportion of slurry and water in the corresponding debris flow r c is 1.3-1.4; the slope rate reduction coefficient n of debris flow is generally taken as 0.50, and the design velocity of debris flow V 2 Take 3.0-6.0m / s, and the foundation safety super-depth h of the transverse tooth sill shall not be less than 1.0m.

[0060] Such as figure 1 , figure 2 shown. The debris flow in the Xiaojiang River Basin, Dongchuan District, Kunming City, Yunnan Province is a dilute-transitional debris flow. In order to reduce and eliminate the debris flow disaster, it is proposed to set up a number of laterally arranged and certain buried horizontal sills on the accumulation fan at the mouth of the valley. The cascade anti-scouring tooth sill system is formed at a certain distance, and at the same time, it forms a row of guide grooves with the d...

Embodiment 2

[0066] According to a large number of data statistics, for water-rock flow-mud flow, its bulk density is generally 13.0-15.0kN / m 3 , the proportion of slurry and water in the corresponding debris flow r c is 1.1-1.3; the slope rate reduction coefficient n of debris flow is generally taken as 0.55, and the design velocity of debris flow V 2 Take 3.0-6.0m / s, and the foundation safety super-depth h of the transverse sill shall not be less than 0.8m.

[0067] Such as figure 1 , figure 2 shown. The debris flow in the Dali area of ​​Yunnan Province is water-rock flow-mud flow. In order to reduce and eliminate the debris flow disaster, it is proposed to set up a number of transversely arranged and certain buried horizontal tooth sills on the accumulation fan of the gully mouth of the river basin. Scrub the tooth sill system, and form a row of guide grooves with the diversion side wall at the same time, which is used for the prevention and control of debris flow. According to th...

Embodiment 3

[0072] According to the statistics of a large number of debris flow valley data, the vertical slope gradient of the natural ditch bed in the middle part of the debris flow valley where the sand control dam is built is i c At 14.05%-28.67% (i.e. 8°-16°), the slope rate reduction coefficient n of the debris flow is generally taken as 0.40, and the design velocity of the debris flow V 2 Take 3.0-6.0m / s, and the foundation safety super-depth h of the transverse tooth sill shall not be less than 1.0m.

[0073] Such as image 3 shown. In order to reduce debris flow disasters in the back mountain debris flow ditch of Ningnan County, Liangshan Prefecture, Sichuan Province, it is planned to build a sand retaining dam 2 in the middle of the debris flow basin, and set up a number of horizontally arranged horizontal sills 1 with a certain buried depth to form steps at a certain interval to prevent erosion The tooth sill system cooperates with the sand retaining dam 2 at the same time as...

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Abstract

The invention discloses a method for designing the embedded depth of foundation of the transverse dentated sill based on the mud-rock flow soft ground energy dissipation and the application thereof. In the method, firstly, the energy consumption hi during the fall of mud-rock flow through the transverse dentated sill is calculated; subsequently, the critical longitudinal slope gradient of the initiation and deposit of the mud-rock flow i0 is calculated; subsequently, the energy consumption coefficient Phi when the mud-rock flow passes the transverse dentated sill and the scour depth below the sill Delta when the mud-rock flow passes the transverse dentated sill are calculated; and finally, the embedded depth of foundation H of the transverse dentated sill is calculated. The invention is applicable to the prevention and treatment of mud-rock flow with hyperconcentrated bi-phase two-dimensional flow, can form a drainage canal with a guide side wall or coordinate with a dam for sand collection to be used for prevention and treatment of the mud-rock flow. Compared with the prior art, on the basis of fully guaranteeing the secure operation of the transverse dentated sill, the method can reasonably confirm the embedded depth of foundation of the transverse dentated sill and save the project cost at utmost, thus being beneficial to the later operation management of the project, furthermore, the calculation method is effective, fast, easy and convenient, and meets the actual project requirement.

Description

technical field [0001] The invention relates to a mud-rock flow anti-scouring technology, in particular to a method for designing the buried depth of a transverse sill foundation based on the energy dissipation of the mud-rock flow soft foundation and its application. Background technique [0002] Debris flow has a much higher bulk density than water flow, and its fluid binary structure containing clastic soil has special characteristics, such as high inertia, strong transport force, and huge impact force. The strong erosion produced by the debris flow movement leads to drastic changes in the ditch bed, causing the bottom of the ditch bed and the collapse of the ditch bank, which increases the source of solid materials to replenish the debris flow and increases the damage of the debris flow. , water canals, electricity, communication lines and other infrastructure, as well as farmland, forests and other serious damage. Therefore, the development of technologies and methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/04
CPCY02A10/11
Inventor 陈晓清李德基游勇
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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