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目前在分析砂土地基地震液化可能性问题时离不开室内振动试验、地震反应分析和有限单元法,但是无论模型实验还是数值分析,其理论可靠性都依赖于基础方程的正确程度。最新的物理模型是建立在地震时砂粒振动错位产生的所谓“过剩孔隙水压力”与渗透产生的“孔隙水压力消散”二者的平衡过程基础上的,也就是在Terzaghi的单向固结方程的右侧增加“过剩孔隙水压力”一项。孔隙水在多孔介质中是一种具有一定静水压力的自由水,在地震波传播中形成某种形式的动水压力作用于作为多孔骨架的
At present, when analyzing the possibility of seismic liquefaction of sand foundation, it is inseparable from the laboratory vibration test, seismic response analysis and finite element method. However, regardless of the model experiment or the numerical analysis, the theoretical reliability depends on the correctness of the foundation equation. The latest physical model is based on the equilibrium process between the so-called “excess pore water pressure” and the infiltration-generated “pore water pressure dissipation” resulting from the misalignment of the sand particles during an earthquake, that is, at Terzaghi’s single To the right of the consolidation equation, add “excess pore water pressure”. Porous water is a type of free water with a certain hydrostatic pressure in porous media. It forms some kind of hydrodynamic pressure in the propagation of seismic waves acting on the porous skeleton