Starting test system for simulating ditch bed deposits under disturbance of upstream debris flow

Abstract

The invention provides a starting test system for simulating ditch bed deposits under disturbance of upstream debris flow. The starting test system comprises a source tank, an artificial rainfall simulating device, an upstream debris flow migration simulating device, a cross plate head shear rheometer, a multi-physical-parameter monitoring system and a measurement and control system. The artificial rainfall simulating device is arranged above the source tank, the upstream debris flow migration simulating device is arranged on the upper portion of the source tank, the cross plate head shear rheometer is connected into the source tank, the multi-physical-parameter monitoring system is arranged in the source tank, and the measurement and control system is connected with the artificial rainfall simulating device, the upstream debris flow migration simulating device, the cross plate head shear rheometer and the multi-physical-parameter monitoring system. The starting test system for simulating the ditch bed deposits under the disturbance of the upstream debris flow has the advantages that starting effects and mechanisms of the ditch bed deposits under the disturbance of the upstream debris flow can be accurately simulated, and accordingly on-way erosion phenomena in debris flow disaster formation procedures can be revealed.

Description

technical field [0001] The invention relates to the technical field of mud-rock flow disturbance research, in particular to a start-up test system for simulating trench bed accumulations under upstream mud-rock flow disturbance. Background technique [0002] Debris flow disaster is one of the frequent natural disasters in mountainous areas of our country, causing a large number of casualties and property losses every year due to debris flow. According to Cui Peng's (2005) research, in 2004, the mudslide disaster reported in my country caused 284 deaths, 216 missing, 266,000 people were affected, and the direct economic loss amounted to more than 4 billion. In recent years, especially after the Wenchuan Earthquake, a large amount of loose solid matter formed on the bank slope or entered the gully bed, which provided a large number of sources for the outbreak of debris flows. The formation of debris flow disasters is the result of flow generation, confluence, and erosion alon...

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Problems solved by technology

[0003] 1. It is difficult to quantify the effect of upstream debris flow, for example, it is difficult to accurately obtain basic variables such as flow depth and flow velocity at different parts of a debris flow in field or model tests

[0004] 2. When the debris flow flows through the deposit, material exchange will occur, that is, on the one hand, it will cause the deposit to start, and on the other hand, it will deposit in the ditch bed, which makes it more difficult to distinguish the start-up depth of the ditch bed deposit

[0005] 3. Due to the start-up of the ditch bed deposits, it is difficult to arrange the sensors in the field or in the model test. On the one hand, if the depth of the sensor deployment is too deep, the evolution law of the physical quantities inside the start-up part of the deposits cannot be obtained. On the other hand, if the sensor Arranged within the starting depth range, the starting sensor will be driven along with the accumulation of ditch bed and easily damaged, which will affect the further collection of test data

[0007] The aforementioned research methods provide a large amount of theoretical basis for the elaboration of the mechanism of ditch bed deposits. The research methods have their own advantages and disadvantages. Indoor experiments can measure parameters, and it is easy to obtain quantitative laws of multiple physical quantities, but they cannot provide an open experimental environment because it is difficult to Simulate the on-site conditions of debris flow initiation; model experiments can simulate the on-site conditions of debris flow trench beds, provide an open environment, and can apply artificial rainfall, but this method is powerless for the quantification of some parameters, and cannot accurately determine the flow depth of the upstream debris flow as a disturbance and velocity distribution parameters

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