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地震液化导致地基土体强度丧失往往对土工建筑物安全造成严重威胁。为借助动力离心模型试验研究地震液化对边坡稳定性的影响,该文采用粘度50cs的硅油作为孔隙流体,通过二步抽真空法制作具有饱和地基的边坡模型,利用不规则任意波作为地震输入进行动力离心模型试验,研究了饱和地基边坡的动力响应、动孔压变化以及坡底液化和滑坡等规律。试验表明:地震中超静孔压有明显增长,地震结束后超静孔压逐渐消散;边坡不同位置超静孔压比明显不同;饱和地基部分液化导致边坡刚度减小和土体阻尼增大从而使边坡土体的加速度明显减小。
The loss of strength of the foundation soil due to earthquake liquefaction often poses a serious threat to the safety of geotechnical structures. In order to study the influence of seismic liquefaction on slope stability by means of dynamic centrifugal model test, a 50 cs viscosity silicone oil was used as pore fluid. A two-step vacuum method was used to produce a slope model with saturated foundation. Using irregular arbitrary wave as an earthquake The dynamic centrifuge model test is input to study the dynamic responses of saturated soil slopes, the dynamic pore pressure changes and the law of slope bottom liquefaction and landslide. The tests show that the excess pore pressure increases obviously during the earthquake, and the excess pore water pressure gradually dissipates after the earthquake. The excess pore water pressure ratio at different positions of the slope is obviously different. The partial liquefaction of the saturated foundation decreases the slope stiffness and the soil damping increases So that the slope soil acceleration significantly reduced.