Centrifuge model test system for stress deformation characteristics of high and steep slope under rainfall conditions

Abstract

The invention discloses a centrifuge model test system for stress deformation characteristics of a high and steep slope under rainfall conditions. The centrifuge model test system comprises a centrifugal layered seepage model box, a rainfall simulation control system, a slope moisture content monitoring system, a slope stress deformation monitoring system and a high-speed camera system, a high andsteep slope model is arranged in the centrifugal layered seepage model box, the rainfall simulation control system is arranged at the upper end of the centrifugal layered seepage model box and downwards right faces the high and steep slope model, detection sensors of the slope moisture content monitoring system and the slope stress deformation monitoring system are arranged in the high and steepslope model, and the high-speed camera system is arranged in the centrifugal layered seepage model box and right faces the high and steep slope model. The test system is high in universality and can be widely applied to slope models under various working conditions; and slope models with various gradients and excavation and reinforcement forms can be subjected to test.

Description

Technical field [0001] The invention belongs to the technical field of geotechnical engineering, and specifically relates to a centrifuge model testing system for the stress and deformation characteristics of a high and steep slope under rainfall conditions. Background technique [0002] A railway project in southeastern Tibet runs in a high-altitude and cold area. The area is fractured, extremely complex in structure, high in seismic intensity and frequent, with very complex topography and poor geological conditions, such as landslides, collapses, mudslides, karsts and earthquakes The frequency of other geological disasters in this area is extremely high. The tunnel openings along the route are mostly located on high and steep slopes, and the slope above the openings can reach up to 800m. The slope rock mass is broken, weathered strongly, and stability is poor. This poses a severe challenge to the smooth construction and safe operation of a railway project in southeastern Tibet....

AI Technical Summary

Problems solved by technology

[0005] 1) Most of the rainfall model tests are simulated under constant gravity conditions, which cannot restore the true stress field of the prototype slope;

[0006] 2) It is difficult to simulate the rainfall conditions in the centrifuge, and other approximate seepage conditions are often used instead of the simulation, which loses the authenticity of restoring the rainfall seepage of the slope;

[0007] 3) The existing few centrifuge rainfall systems cannot accurately control the rainfall intensity and duration, and accurately restore the prototype slope rainfall conditions;

[0008] 4) The existing model test equipment cannot be used to simulate the boundary conditions of rainfall infiltration on high and steep slopes, and it is easy to generate large seepage boundary interference, which affects the authenticity of the experimental simulation;

[0009] 5) There is a lack of systematic research on the slope runoff and slope infiltration process of high and steep slopes under rainfall conditions. Deformation instability criterion;

[0010] 6) Most of the internal parameters of the rainfall slope monitored by existing experiments are only records of simple parameters such as water content, and the systematic monitoring and recording of the moisture field, stress field inside the slope, and the external apparent deformation of the slope have not been obtained;

[0011] 7) The image recording of the existing centrifugal model test system is relatively rough, and there is a lack of an image recording system that can quantify the development of cracks on the slope surface and the entire process of slope deformation and failure.

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