A method for judging the activity of loose source of debris flow

Abstract

A method for judging the activity of loose source of debris flow. First, investigate the source of loose material, determine the geological background conditions of the source of debris flow, and take samples for testing; secondly, calculate the particle characteristic parameters of the source of loose material, and obtain the effective particle size and non-uniformity coefficient respectively. and curvature coefficient to calculate the particle characteristic function value; obtain the topographic parameters of the loose provenance again, and calculate the slope characteristic function of the slope of the loose provenance accumulation by measuring the central section of the loose provenance accumulation body; finally calculate the occurrence state of the provenance and determine its mode of action. The method of the present invention has mature testing means and simple calculation mode, and can quickly judge the activity of debris flow sources in the debris flow ditch for evaluation and investigation of debris flow disasters, thereby providing support for more accurate assessment of the activity of debris flow disasters and effectively improving disaster prevention workers. The evaluation accuracy of the disaster body.

Description

technical field [0001] The invention belongs to the field of mud-rock flow disaster prevention and control, and in particular relates to a method for judging the activity of loose source of mud-rock flow. Background technique [0002] Debris flow is a typical geological disaster in mountainous areas of my country. Dynamic risk assessment and evolution trend prediction are important issues in the prevention and mitigation of debris flow disasters. Previous studies have shown that the coupling effect of provenance and water body is an important catastrophic process in the formation of debris flow disasters. There are two models for the transformation of loose matter sources into debris flow disasters. One is that loose matter sources enter the ditch and transform into ditch bed matter, which starts to form debris flow under the erosion of channel runoff. The other is that loose matter sources directly recharge Channel fluid forms debris flow. In both models, the initiation o...

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Problems solved by technology

[0003] In the current debris flow disaster evaluation and exploration methods, the source evaluation of debris flow mainly considers topographic parameters, and judges whether the source is active and whether dynamic reserves can be generated according to the deformation signs of the accumulation body. By comparing the slope of the accumulation body and the self-stabilizing slope The difference between them is used to calculate the total dynamic reserves, and the characteristic state of the geological body of the provenance is not coupled and analyzed, so that the calculation method cannot accurately divide the magnitude of its activity, and it is difficult to judge the evolution process of a single provenance

When investigating debris flow disasters and predicting the evolution trend of debris flow disasters, it is difficult to clearly describe the relationship between the characteristics of the provenance and the scale and frequency of disasters, resulting in a discrepancy between the analysis conclusions and the actual characteristics of disaster activities

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