压实黄土应力-应变-时间特性

Stress-strain-time behavior of compacted loess

为研究压实黄土应力-应变-时间的关系,对比分析了Singh-Mitchell、Mesri、Lin-Wang等经验模型,在甘肃省陇西Q3压实黄土的室内一维固结试验基础上,利用参数变异法推导出适用于压实黄土的Singh-Mitchell修正模型。其中应力-应变关系与应变-时间关系都用幂次关系模拟。模型中3个参数物理意义明确,均可由室内一维固结试验得出,并分析了干密度与含水质量分数对参数的影响规律。研究结果表明,模型计算结果与实测结果一致,为研究压实黄土应力-应变-时间特性提供了一种新方法。

In order to study the stress-strain-time behavior of compacted loess, the empirical models proposed by Singh-Mitchell, Mesri and Lin-Wang are analyzed. An alternative stress-strain-time function for compacted loess is deduced in terms of one-dimensional consolidation tests based on the specimens of Q3 loess. The relationships of stress-strain and strain-time are simulated with power functions. The model contains 3 parameters with explicit physical meanings and they can be gotten from one-dimensional consolidation tests easily. The impact of dry density and moisture content on the parameters are also analyzed. It is shown from examples that the results calculated with the model agree with that one by measurements. It provides a new method to examine stress-strain-time behavior of compacted loess. 5 figs, 10 refs.