Test device and method for simulating the influence of earthquake and rainfall effects on side slope stability

Abstract

The invention provides a test device and method for simulating the influence of earthquake and rainfall effects on side slope stability. The device comprises an artificial rainfall device, a model box, a vibration table, a test monitoring system and a computer terminal. A flow meter is connected with a water supply main tube; the water supply main tube is connected with a water supply branch tube; the lower part of the water supply branch tube is connected with a rainfall sprayer; a water storage tank is connected with an electronic control valve through a water returning pipe; the model box is located below the rainfall sprayer; the model box is fixedly connected with the vibration table. The method comprises the steps that in the test, a high-definition digital image processing technique is used to track and observe the displacement change of side slope soil body; at the same time of camera shooting in the whole process, after the earthquake and rainfall effects, positions having abnormal situations of the side slope side and the side slope surface are observed and recorded; classification and integration and analysis are conducted on the collected data to obtain a side instability mechanism under the coupling effects of earthquake and rainfall. The test device and method have the advantages of carrying out related experiments of single earthquake, single rainfall, and the coupling effects of earthquake and rainfall; being simple in structure and low in test cost.

Description

technical field [0001] The invention relates to a test device and method for simulating the influence of earthquake and rainfall on slope stability. Background technique [0002] Landslide is a common natural disaster, which has the characteristics of wide distribution, high frequency of outbreaks, and great harm. my country's mountainous area is quite vast, accounting for 2 / 3 of the total land area, and natural slopes are widespread, and with the rapid development of infrastructure, there will be more and more large-scale slope projects. In recent years, with global warming, more and more disasters such as landslides and debris flows induced by heavy rainfall and abnormal extreme weather have attracted widespread attention from scholars of geological disasters in various countries. The "China Geological Hazard Database" records the landslide disasters that occurred in my country. Among the disasters recorded, most of the landslides are induced by rainfall. At the same tim...

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Problems solved by technology

However, the formation and occurrence of landslides is a very complex natural phenomenon due to the action of multiple factors, so it is impossible to study the failure mode and instability mechanism of the slope only by indoor conventional geotechnical experiments and in-situ experiments.

[0003] At present, there are experiments similar to the model box, but the three side walls of the model box are made of wood. When the water content of the slope model is high, the wooden side wall is easy to corrode and not durable. The two side walls of the vertical seismic wave are made of wood, which has a reflection effect on the seismic wave. , it is easy to form reflected waves, resulting in test errors, and the test device can only simulate the earthquake, and cannot realize the slope stability research under the coupled action of earthquake and rainfall

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