岩土力学Issue(10)：2971-2978,8.
基于数字图像相关法的砂土细观直剪试验及其颗粒流数值模拟
Meso-direct-shear test of sand based on digital image correlation method and its PFC numerical simulation
摘要
Abstract
Sand, as a kind of typical natural granular material, its special mechanical behaviors, such as compressive hardening, dilatancy, anisotropy, etc., are controlled by the internal meso-fabric and its evolution. How to quantify the meso-fabric by experiment and numerical simulation is essential to further study the deformation mechanism of sand. The optical measurement technique based on relevant digital image methods is combined with soil test;and then a measuring system named“meso instantaneous optical system for sands deformation”, which can preliminarily achieve the macro-and meso-mechanical behaviors of soil, is developed by visually upgrading the shear box. The laboratory meso-diret-shear tests for Fujian standard sand are carried out by using this system. And then, numerical direct shear tests based on the software of particle flow code in two dimensions (PFC2D)are performed; and some meso-information which are difficultly obtained from laboratory test are extracted as its supplement. The test results of macro-and meso-mechanical behaviors including displacement field, strain field, particle orientation, velocity field, coordination number and force chain are compared and analyzed;and then the meso-mechanism of sand mechanical behavior is further studied.关键词
砂土/数字图像相关方法/直剪试验/颗粒流程序/宏观力学特性/细观机制Key words
sands/digital image correlation method/direct shear test/particle flow code/macromechanical properties/meso-mechanism分类
数理科学引用本文复制引用
孔亮,陈凡秀,李杰..基于数字图像相关法的砂土细观直剪试验及其颗粒流数值模拟[J].岩土力学,2013,(10):2971-2978,8.基金项目
山东省自然科学杰出青年基金资助项目（No. JQ201017）；国家自然科学基金资助项目（No.50979037，No.51008166）。 （）
