基于SMP的粒状材料各向异性强度准则

SMP-based anisotropic strength criteria of granular materials

基于SMP准则,假定不同平面上的摩擦角随该平面与沉积面之间的夹角变化,提出了一般应力条件下各向异性粒状材料的强度准则,称为ASMP准则,给出了该强度准则在横观各向同性条件下的表达式。对两种典型条件下各向异性砂土强度特性的模拟结果表明,ASMP准则能够较好的反映粒状材料在一般应力条件下的强度变化规律,尤其是材料主轴与应力主轴成任意角度时的强度变化。在此基础上,进一步提出了该各向异性强度准则在典型条件下的实用表达式。

Assuming that the friction angle on different slip planes varied with the angle between the slip plane and bedding plane, an anisotropic strength criterion was established based on the concept of SMP. The formulation for cross-anisotropic granular materials was then derived. The capability of the newly developed strength criterion, named as ASMP, was examined by comparison between the results of simulation with ASMP and the available experimental data under two typical conditions. It was shown that the anisotropic strength criterion could capture the variation of the shear strength under general stress conditions, especially when the direction of deposition varied arbitrarily. The practical formulations under the above two conditions were also presented.