研究地基液化的新方法

A New Research Method for Foundation Liquefaction

介绍一种研究地基液化的新方法［１］。利用地震时可能液化的土层的地面加速度、地下钻孔加速度及孔隙水压力方面的连续资料（使用仪器测定），通过计算处理，先后获得土层的水平位移反应、平均剪应变和有效应力。在此基础上，对平均剪应力—应变和有效应力路径历史作出评价。

The method is new and effective.The instruments,measuring space acceleration and pore water pressure,are placed in the liquefiable soil horizon to record accelerations of surface and downhole as well as porewater pressure in situ during earthquakes.Because the acceleration and porewater pressure vary with time,the shear stress,shear strain and effective stress,are continuative function of time,changed with time.Through the double numerical integral to the acceleration,the horizontal displacement of soil horizons can be obtained,according to the recorded seismic acceleration.The average shear strain can be calculated in accordance with the horizontal displacement response.On the principle of effective stress,the equation of effective stress=general stress pore water pressure can be obtained.Finally,the accelerations of surface and downhole and pore water pressure recorded during earthquakes could be used to evaluate the average shear stress strain and path history of effective stress,which is a valuable and direct data for the research on the fourdation liquefaction when seismic vibration.