基于结构性黄土抗拉和抗剪特性的双线性强度及其应用

A bilinear strength formula for structured loess based on tensile strength and shear strength and its application

通过试验研究了结构性黄土的抗拉强度,然后结合抗拉强度和抗剪强度的试验结果建立了适用于结构性黄土的双线性强度公式,通过研究结构性土体在拉剪应力区域的破坏应力修正算法,并将其纳入到边坡稳定性分析计算中。研究结果表明:在结构性黄土边坡稳定性计算中直接采用Mohr-Coulomb强度公式计算会高估土体抗拉强度的影响,使得计算结果偏大,而忽略结构性黄土的抗拉强度时又会使得计算结果过于保守,采用基于抗拉和抗剪特性的结构性黄土双线性强度公式可以较为合理地评价结构性土体抗拉强度的作用。

The shear strength and tensile strength are two aspects of the mechanics characteristics of structured soils. The tensile strength of structured loess is studied through experiments, then a bilinear strength formula for structured loess is obtained by combining the tensile strength with the shear strength according to the test results, which is applied into the stability analysis of structured loess slope by studying the failure stress modification algorithm of the tensile coupling with shear state. The research results show that the traditional Mohr-Coulomb strength formula will exaggerate the effect of tensile strength of structured soils, which leads to the exaggerated results in computation, while the computational results are too conservative regardless of the tensile strength of structured soils, thus the bilinear strength formula based on the tensile strength and shear strength can reasonably estimate the effect of the tensile strength of structured soils in fact.