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Method for calculating destabilization of rockfill of small-watershed ditch

A calculation method and rockfill technology are applied in the field of calculation of the instability of rockfill in a small watershed channel, which can solve problems such as difficulty in adapting to engineering needs, and achieve the effects of improving applicability, high accuracy of calculation results, and accurate calculation results.

Inactive Publication Date: 2017-07-14
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] This patent document, by controlling different rainfall intensities and rainfall processes, observes the hydrodynamic characteristics of water flow in different landforms, and then realizes the simulation of watershed soil erosion process under different site conditions and different rainfall conditions. However, the experimental process has not been carried out in detail. The physical mechanism discussion and strict theoretical derivation are only observation and summary of experimental phenomena, which are difficult to meet the needs of actual engineering.

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  • Method for calculating destabilization of rockfill of small-watershed ditch
  • Method for calculating destabilization of rockfill of small-watershed ditch
  • Method for calculating destabilization of rockfill of small-watershed ditch

Examples

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Effect test

Embodiment 1

[0037] A calculation method for rockfill instability in small watershed trenches, comprising the following steps:

[0038] a. Select a single-width rockfill body in a small watershed channel for force analysis, draw a force diagram of the critical state of the rockfill body, and analyze the gravity of the rockfill body in the channel and the impact it receives in the event of a debris flow in the channel Power and resistance; set the single-width rockfill body in the channel of a small watershed to P as the impact force of the upstream fluid in the direction parallel to the channel, and Wsinθ as the gravity component in the direction parallel to the channel; set the small The grain friction force of the single-width rockfill body in the channel parallel to the channel is f, the support force of the channel bed in the direction perpendicular to the channel is N, and the gravity component in the direction perpendicular to the channel is Wcosθ;

[0039] b. Calculate the debris fl...

Embodiment 2

[0056] A calculation method for rockfill instability in small watershed trenches, comprising the following steps:

[0057] a. Select a single-width rockfill body in a small watershed channel for force analysis, draw a force diagram of the critical state of the rockfill body, and analyze the gravity of the rockfill body in the channel and the impact it receives in the event of a debris flow in the channel Power and resistance; set the single-width rockfill body in the channel of a small watershed to P as the impact force of the upstream fluid in the direction parallel to the channel, and Wsinθ as the gravity component in the direction parallel to the channel; set the small The grain friction force of the single-width rockfill body in the channel parallel to the channel is f, the support force of the channel bed in the direction perpendicular to the channel is N, and the gravity component in the direction perpendicular to the channel is Wcosθ;

[0058] b. Calculate the debris fl...

Embodiment 3

[0075] A calculation method for rockfill instability in small watershed trenches, comprising the following steps:

[0076] a. Select a single-width rockfill body in a small watershed channel for force analysis, draw a force diagram of the critical state of the rockfill body, and analyze the gravity of the rockfill body in the channel and the impact it receives in the event of a debris flow in the channel Power and resistance; set the single-width rockfill body in the channel of a small watershed to P as the impact force of the upstream fluid in the direction parallel to the channel, and Wsinθ as the gravity component in the direction parallel to the channel; set the small The grain friction force of the single-width rockfill body in the channel parallel to the channel is f, the support force of the channel bed in the direction perpendicular to the channel is N, and the gravity component in the direction perpendicular to the channel is Wcosθ;

[0077] b. Calculate the debris flow...

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Abstract

The invention discloses a method for calculating destabilization of rockfill of a small-watershed ditch and belongs to the technical field of geological hazard control engineering. The method is characterized by comprising the following steps: a. carrying out force analysis on unit-width rockfill of the small-watershed ditch; b. calculating flow velocity VC of debris flow, inferring a distinguishing calculation expression for the rockfill of the small-watershed ditch according to theory of mechanics; c. destabilizing the rockfill according to a mechanical equilibrium condition when a motive force stressed by the rockfill is greater than a resisting force stressed by the rockfill, so as to obtain a distinguishing calculation expression for destabilization of the rockfill in the ditch. According to the method, a destabilization value of the rockfill of the small-watershed ditch can be reasonably determined on the basis of strict theoretical derivation, and thus, a basis is provided for controlling and warning debris-flow disasters of small watersheds; the calculated result is high in accuracy, so that the method meets actual engineering demands.

Description

technical field [0001] The invention relates to the technical field of geological disaster prevention and control engineering, in particular to a calculation method for the instability of small watershed channel rockfill bodies. Background technique [0002] After the earthquake, the collapses and landslides developed in the watershed provided a rich source of loose solid matter for the activities of the debris flow, making the debris flow the most active disaster after the earthquake. Among these debris flows, small watershed debris flows are often ignored or not paid enough attention due to the small area of ​​the watershed, but they cause relatively large disaster losses. [0003] The dynamic process of debris flow in small watersheds is a very complicated process of energy dissipation, which is mainly manifested in the presence of blockages in the channels of such debris flows, which play a role of "sand retention and water storage" similar to dams, so that the materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 唐川乐茂华卜祥航周伟朱静李为乐常鸣
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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