Physical model for simulating soil slope instability induced by groundwater

Abstract

The invention discloses a physical model for simulating soil slope instability induced by groundwater and belongs to the field of physical model tests. The physical model comprises a model case and ischaracterized by further comprising an external water tank and a lifter, wherein a base is fixedly arranged on the inner bottom wall of the model case; an impervious layer is fixedly arranged on thebase; a soil layer is arranged on the impervious layer; a pore-water pressure sensor, a soil pressure sensor and a differential displacement sensor are arranged in the soil layer; an internal water tank is arranged on one side of the base; water level scales are etched on one side wall of the internal water tank; a plurality of water seeping holes are formed in the other side wall of the internalwater tank; porous stones and geotechnical cloth are sequentially arranged between the water seeping holes and the soil layer; a stainless steel hose is connected to the internal water tank; a water flow sensor is fixedly arranged on the stainless steel flexible hose. According to the physical model disclosed by the invention, underground water level height can be accurately adjusted in real time;in addition, the infiltration capacity of a slope body at certain water level height can be maintained, scouring to a soil model can be effectively avoided, and a good test effect is realized.

Description

technical field [0001] The invention relates to the field of physical model tests, in particular to a physical model 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. 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. Therefore, realizing the control of the groundwater level is the most critical prerequisite for studying groundwater-induced soil slope stability through model tests. [0003] The centrifuge model test is currently the best model test method. The gravity is simulated by the centrifugal forc...

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Problems solved by technology

[0005] The geotechnical centrifugal model test equipment disclosed in this patent document cannot realize accurate and continuous water level control, and cannot obtain the amount of infiltration to the slope when a certain water level is maintained, 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, which will cause serious damage to the model, can not achieve the ideal control of groundwater level, and can not achieve the expected test results

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