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一、前言 用试验手段模拟地震作用是十分复杂的,目前在实验室进行砂土液化试验多采用动三轴仪、动单剪仪和扭剪仪,由于这些试验中采用的试样尺寸小,其边界条件、受力状态不能满意地模拟地震时现场沉积砂土的性状。一般认为,地震时饱和砂土液化,主要是由于动基岩向上传播的剪切波在土体内产生的循环剪应力而引起土内超孔隙水压力作
I. INTRODUCTION The use of experimental means to simulate earthquakes is very complicated. At present, sand triaxial liquefaction tests are often performed in laboratories using dynamic triaxial instruments, dynamic single shear instruments, and torsional shear instruments. Since the size of specimens used in these tests is small, The boundary conditions and stress conditions cannot satisfactorily simulate the behavior of sedimentary sand on site. It is generally believed that the liquefaction of saturated sand during earthquakes is mainly caused by the cyclic shear stress generated in the soil by shear waves propagating upwards from the moving bedrock and causing excess pore water pressure in the soil.