单剪试验的细观模拟研究

采用离散单元法的颗粒流理论,模拟了松砂和密砂的单剪固结排水试验,研究了单剪试验中砂土细观力学行为和细观组构的演化规律。本文采用PFC2D实现了单剪试验的模拟,记录了实验中颗粒的分布图,接触力分布图,位移图等,同时也测得应力-应变关系,以及配位数等,并用origin软件将其绘制成图表。分析了砂土变形过程中细观组构的变化,并对比分析了松砂、密砂在剪切过程中变形机制的区别。最后阐述了剪切过程中应力主轴的旋转问题。

The microscopic simulation study of simple shear

We use the particles flow theory by discrete element method to simulate the single shear consolidated drained test with loose sand and dense sand. Then we discussed the sand micromechanics and the evolution of microfabric in the simple shear test.In this essay,we use PFC2Dto achieve a single shear test simulation,and record the distribution of particles,the contact force distribution and displacement in the experiment.Also we measured the stress-strain relations and the coordination number,etc.and draw them with origin software.Then we analyze the change of microfabric during the deformation of sand and the difference between the loose sand and dense sand comparatively.At last,we describe the rotation of stress axes during the shear.