软土震陷特性的试验研究

基于饱和软粘性土与福建标准砂的静力孔压软化试验和动三轴震陷试验的分析研究，揭示了饱和松砂的软化应变具有突变性，当其孔压比小于某一限值时基本无软化现象，而饱和软粘性土则呈现随孔压增长而渐软化的特点。按文中建议的软化试验与动三轴震陷试验结果的对比，可区分震陷中的软化应变和惯性应变，为进一步综合分析计算土体由这两种应变形成的震陷奠定了基础。

Experimental investigation of soil seismic deformation property

Based on a large number of static pore-pressure softening tests and dynamic tests,the analysis for seismic deformation and softening property of saturated soft soils are studied. It is shown by the tests that the saturated sand has a catastroph property which shows almost no softening phnomenon before reaching a certain pore pressure ratio, while the saturated soft clayey soils present a gradually increasing residual seismic deformation and apparent softening phnomenon. It is possible to differentiate the softening effect and effect of inertia forces induced by earthquake shaking based on the contrast between the static tests and dynamic tests.Consequently, these two kinds of effects can be taken into consideration to calculate the soil seismic deformation, and therefore this calculation is more reasonable. With regard to the corresponding calculation it will be presented in another paper.