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本文研究了土液化的物理意义和它的作用机理,重点论述了饱和无粘性土液化时的应力状态及其演化规律,并通过若干代表性例子加以说明。文章还探讨了其它有关问题,得出下列结论:饱和无粘性土在走向液化过程中的应力状态始终受制于极限平衡条件,并趋近于“静水压力”;应变量不宜作为土液化定义中有效的参考量;饱和无粘性土在往返荷载或振动作用下的孔隙水压力变化机理与颗粒排列结构的变化特性、排水条件和边界条件等有关.
In this paper, the physical meaning of soil liquefaction and its mechanism of action are studied. The stress state and evolution law of liquefied saturated cohesive soil are discussed in detail, and illustrated by several representative examples. The article also explores other related issues and draws the following conclusion: The stress state of saturated cohesiveless soil in the process of liquefaction is always subject to the limit equilibrium condition and approaches the “hydrostatic pressure”; the strain amount should not be considered effective in the definition of soil liquefaction. The reference volume; the mechanism of pore water pressure change of saturated cohesive-free soil under cyclic loading or vibration is related to the variation characteristics of particle arrangement structure, drainage conditions, and boundary conditions.