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不均匀地层中超静孔压的扩散、重分布过程会导致孔隙水集中渗流累积至局部区域,导致该区域土体强制吸水,从而引发剪胀性砂土边坡地震后侧向流动变形甚至失稳。通过分析边坡流动变形过程中砂土的应力路径特征及强制吸水条件下的体变平衡条件,指出预测剪胀性砂土边坡流动变形的关键是描述砂土保持常剪应力和当前峰值应力比时的剪胀特性和震后再固结体变特性。通过常偏应力下的三轴剪切吸水试验,观察了砂土在流动变形过程中的吸水量与剪应变发展的关系,给出了基于强制吸水体变预测流动剪应变的状态剪胀模型。基于剪切后再固结试验,得出了再固结体变的变化规律和数学描述。基于所提出的机制和数学描述,给出了基于有限差分法的边坡流动变形发展过程直至失稳破坏的模拟方法。
Uneven stratospheric pressure in the super-pore diffusion and redistribution process will lead to the accumulation of porous water seepage to the local area, resulting in forced absorption of soil in this region, which led to dilapidation of sand and sand lateral flow after the earthquake deformation or even destabilization . Through analyzing the stress path characteristics of sand and soil under the condition of forced water absorption, the key to predict the flow deformation of dilapidated sand slope is to describe the effect of sand holding normal shear stress and current peak stress Dilatancy characteristics over time and post-earthquake consolidation behavior. Through the triaxial shear water absorption test under normal deviatoric stress, the relation between the amount of water absorption and the development of shear strain of sand during flow deformation was observed, and the state dilatancy model based on predicting the flow shear strain was derived. Based on the shear consolidation test, the changing regularity and mathematical description of the re-consolidated body are obtained. Based on the proposed mechanism and mathematical description, a simulation method of slope deformation and failure until failure is given based on the finite difference method.