Adjustable debris flow starting simulation experiment system under combined action of rainfall and confluence

Abstract

The invention relates to an adjustable debris flow starting simulation experiment system under combined action of rainfall and confluence. The bottom of a material tank of the experiment system can bereplaced, so that not only can the matching degree of the roughness of the bottom of the tank with an original experiment soil body be ensured, but also the water permeability of the bottom of the tank can be fully considered; the width of the material tank of the experiment system can be adjusted according to the characteristics of debris flow in an area, so that the universal applicability is realized; an artificial rainfall system of the experiment system expands the continuously-varying rainfall intensity range, can fully consider the similarity between an artificial rainfall type and a rainfall process and can achieve the purpose of characterizing the corresponding encounter process by adopting rainfall, rain intensity and rainfall type; water for simulating rear confluence scour inthe debris flow starting test can be proportioned into a certain concentration, so that the similarity of experimental flow concentration is ensured; the experiment simulation device can achieve integrated control, avoid tedious steps during the experiment operation and classify experiment wastes at the end of an experiment.

Description

technical field [0001] The invention relates to a simulation experiment system about mud-rock flow, in particular to an adjustable mud-rock flow start-up simulation experiment system which integrates rainfall and confluence. Background technique [0002] Referring to the statistical data in recent years, it can be seen that the area of ​​debris flow activity in China is 4.3 million km 2 , Debris flow has become a major disaster that cannot be ignored in the economic construction of mountainous areas. Due to the sudden and rapid characteristics of debris flow outbreaks, its initiation and movement processes are seldom directly observed. Therefore, the development of debris flow initiation experiments has become an important means to study the mechanism of debris flow initiation. [0003] Most debris flows in China are induced by rainfall, and the physical simulation of debris flow initiation triggered by rainfall and its confluence scour has attracted much attention. Howev...

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Problems solved by technology

From the point of view of the experimental methods and materials commonly used at present, there are the following problems: (1) Most of the indoor physical simulation tests continue to use the straight inclined small debris flow trough to simulate the ditch bed. However, the matching degree between the roughness of the tank bottom and the original experimental soil cannot be guaranteed; (2) most of the current indoor simulation experiments on the bottom of the debris flow tank only consider the increase of friction and ignore the problem of water permeability; (3) the present stage Debris flow model troughs are designed for a specific area and do not have universal applicability; (4) The rainfall formed by the current artificial rainfall devices is continuous and uniform, failing to take into account the similarity between artificial rainfall types and rainfall processes , the overall and actual natural rainfall are quite different; (5) the current debris flow start-up test models can effectively guarantee the geometric similarity between the test and the prototype, and the similarity of water flow concentration is not involved; (6) the current simulation experiment devices are all There is a problem of inconvenience in actual operation, and it is impossible to achieve integrated control

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