空心圆柱扭转仪定向剪切试验离散元模拟

发布时间：2018-05-04 20:15

本文选题：离散元 + 空心圆柱扭剪仪　；参考：《岩土力学》2016年04期

【摘要】：为分析砂土在复杂应力条件下的剪切力学特性,采用商业离散元软件PFC3D对单粒组中密砂的空心扭剪试验进行了仿真模拟,分析了数值试样的应力-应变关系,研究了不同剪切方向下离散介质的强度、体积应变特性以及中主应力比对它们的影响,再现了力链在加载过程中的演化,并对剪切带的倾角做了深入分析。同时,从细观上看,以颗粒接触数和纯转动率变量为中心,观察了试样内部颗粒的运动状态,对比了不同剪切方向下剪切带内外颗粒接触数与纯转动位移的变化。最后,将数值试验结果与已有的室内试验结果进行了对比。此研究实现了复杂应力条件下空心扭剪试样的三维离散元模拟,加深了对空心扭剪试验过程和结果的理解和解释。
[Abstract]:In order to analyze the shear mechanical properties of sand under complex stress conditions, a commercial discrete element software PFC3D was used to simulate the hollow torsional shear test of dense sand in a single grain group. The stress-strain relationship of numerical specimens was analyzed. The effects of strength, volumetric strain characteristics and the ratio of intermediate principal stress on the discrete medium in different shear directions are studied. The evolution of the force chain during loading is reappeared, and the dip angle of the shear band is deeply analyzed. At the same time, from a meso point of view, the movement of particles in the sample was observed by taking the contact number of particles and the variable of pure rotation rate as the center, and the changes of the contact number of particles and the pure rotational displacement in the shear band were compared under different shear directions. Finally, the numerical test results are compared with the existing indoor test results. In this study, three-dimensional discrete element simulation of hollow torsional shear specimens under complex stress conditions is realized, and the understanding and interpretation of the process and results of hollow torsional shear tests are deepened.
【作者单位】：同济大学地下建筑与工程系;温州大学防灾减灾研究所;
【基金】：中国博士后科学基金(No.2015M571602) 国家自然科学基金(No.41202186,No.11372228)~~
【分类号】：TU441

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