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有效应力及其参数的确定是非饱和土有效应力理论中一个重要的问题,该文借鉴了Blight方法和邢义川方法的思想,提出了一种新的求解方法。通过构建非饱和土的总应力、孔隙气压力和基质吸力与大主应变的关系,采用极限的思想,遵照有效应力原理,推导出有效应力及其参数的计算公式。并在饱和度分别为0和1的两种极限条件下,对该文推导的有效应力参数的计算公式进行检验。检验的结果表明:该文推导的计算公式在饱和度分布为0和1时,有效应力参数能够分别蜕化到0和1。
The determination of effective stress and its parameters is an important issue in the theory of effective stress in unsaturated soils. This paper draws on the ideas of Blight method and Xing Yichuan method, and proposes a new solution method. By constructing the relationship between total stress, pore pressure and matrix suction of unsaturated soils and the principal strain, the formula of effective stress and its parameters are deduced by adopting the limit idea and following the principle of effective stress. Under the two kinds of limit conditions with saturations of 0 and 1 respectively, the calculation formulas of the effective stress parameters derived from this paper are tested. The test results show that the effective stress parameters can degenerate to 0 and 1 respectively when the saturation distribution is 0 and 1.