Method for simulating soil slope instability induced by groundwater

Abstract

The invention discloses a method for simulating soil slope instability induced by groundwater. The method is characterized by comprising the following steps: a, putting a physical model on a centrifugal machine; b, raising the height of an external water tank, opening a water outlet valve and a water inlet valve, carrying out water seepage into a soil layer according to the thickness of a saturated soil layer and completing the saturation process of a soil mass; c, closing the water inlet valve, reducing the height of the external water tank, improving the centrifugal acceleration to solidifyand disperse the internal pore water pressure of the physical model; d, after the solidification is finished, opening the water inlet valve, raising the height of the external water tank to the corresponding height according to the preset water level height of an internal water tank; obtaining different infiltration capacity of the water to the slope when the water in the internal water tank seepsinto the soil layer and stays at different heights, and observing the wetting front change and the slope deformation condition of the physical model. The method disclosed by the invention has the advantages that the height of the groundwater level can be accurately adjusted in real time and washing of water current to the slope body is prevented; in the whole test process, high operability, highreliability and good test effect are realized.

Description

technical field [0001] The invention relates to the field of physical model tests, in particular to a method for simulating groundwater-induced soil slope instability on a centrifuge. Background technique [0002] In soil slopes, human disturbance, rainfall, irrigation and groundwater are the main factors affecting slope stability. [0003] At present, the influence of man-made disturbances such as excavation, stacking, and rainfall on the stability of soil slopes has been systematically studied through laboratory tests, numerical simulations, and model tests. Due to the limitations of control technology, most of the researches on it focus on indoor experiments and numerical simulations. [0004] Therefore, realizing the control of the groundwater level is the most critical prerequisite for studying groundwater-induced soil slope stability through model tests. The centrifuge model test is currently the best model test method. The gravity is simulated by the centrifugal for...

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Problems solved by technology

[0006] The geotechnical centrifugal model test equipment disclosed in this patent document cannot achieve accurate and continuous water level control, and cannot obtain the amount of infiltration to the slope body when maintaining a certain water level, and under centrifugal force, water will pass through the seepage holes to the model box. The model produced a scour effect, the greater the centrifugal force, the more obvious the scour effect, it will cause serious damage to the model, can not achieve the ideal control of groundwater level, can not achieve the expected test results

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