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首页> 外文期刊>Granular matter >Triaxial compression tests of QH-E lunar soil simulant under constant mean principal stress path using discrete element method simulations
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Triaxial compression tests of QH-E lunar soil simulant under constant mean principal stress path using discrete element method simulations

机译：恒平均主应力路径下QH-E月球土壤模拟物三轴压缩试验的离散元模拟

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摘要

In this paper, discrete element method (DEM) simulations are applied to investigate the triaxial compression tests of QH-E lunar soil simulant (developed by Tsinghua University, China) under constant mean principal (P) stress path. The P stress path is achieved by controlling the loading speed and direction of the axial stress and confining stress in the DEM simulations, the strain softening and dilatancy characteristics of QH-E lunar soil simulant both at low and conventional P stress levels are discussed. The results show that the deviatoric stress-strain curve is divided into hardening, softening descending, and residual strain stages, and the shear strength and residual strength increase with the increase of P stress, which are similar to the conventional triaxial compression tests. The volumetric strain versus shear strain curve shows a good linear relationship both at the linear shear dilatancy and residual shear dilatancy stages, but the slope of the linear dilatancy stage is larger than that of the residual dilatancy stage. Furthermore, it is found that the variations of shear dilatancy characteristic parameters with regard to P stress also show a good linear relationship, and the values of these parameters increase with the increase of P stress.
机译：本文采用离散元方法（DEM）模拟研究了QH-E月球土壤模拟物（由清华大学开发）在恒定平均主应力（P）应力路径下的三轴压缩试验。通过在DEM模拟中控制加载速度，轴向应力和约束应力的方向来实现P应力路径，并讨论了低和常规P应力水平下QH-E月球土壤模拟物的应变软化和剪胀特性。结果表明，偏应力-应变曲线分为硬化，软化下降和残余应变阶段，剪切强度和残余强度随着P应力的增加而增加，与传统的三轴压缩试验相似。体积应变-剪切应变曲线在线性剪胀和残余剪胀阶段均表现出良好的线性关系，但线性剪胀阶段的斜率大于残余剪胀阶段的斜率。此外，发现剪胀系数特性参数相对于P应力的变化也显示出良好的线性关系，并且这些参数的值随着P应力的增加而增加。

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