基于颗粒流离散元的粘性土三轴剪切试验数值模拟
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河海大学,河海大学,河海大学,河海大学,河海大学,河海大学

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TU411

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国家自然科学基金项目(NO. 51508159)、江苏省自然科学基金(BK20151495)、河海大学中央高校基本科研业务费专项资金(NO. 2016B20214,2016B06114)


Numerical simulation of cohesive soil triaxial shear test based on particle flow discrete element
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Hohai University,,,,,

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    摘要:

    为了研究粘性土体的工程力学性质,本文通过对粘性试样进行室内三轴固结排水试验,得到了试样土体的应力—应变关系曲线以及强度指标,基于颗粒流离散元法的原理,利用PFC3D软件建立三轴试样模型,并设定颗粒间的接触为接触黏结模型,通过颗粒流数值试验对细观参数进行标定,从细观角度对粘性土的工程力学特性做了一定的研究。对比了不同围压下数值试验与室内试验的应力应变关系曲线,得到了较好的模拟效果。分析细观参数的变化对粘性土的应力—应变关系曲线的影响,得出边界条件、孔隙率、粘结强度、摩擦系数、接触刚度等细观参数的取值对粘性土的宏观力学性质有着显著的影响并对影响规律做了探讨,为今后的三轴试验颗粒流数值模拟提供了有价值的参考。

    Abstract:

    In order to study the engineering mechanics properties of cohesive soil, the stress—strain curves and the strength indexes of the sample soil is acquired through conducting the laboratory consolidated drained triaxial test with the cohesive soil. In this paper,. The numerical model is built by using PFC3D code based on the principle of particle flow discrete element. The contact between balls is set as contact-bond model. After conducting the particle flow numerical test and calibrating the mesoscopic parameters, we have do some research on the engineering mechanics properties of cohesive soil fromSthe perspective of mesoscopic. The stress-strain curveSunder different confining pressure of laboratory test and numerical test is compared, the simulation effect is remarkable. The conclusion is that the value of some mesoscopic parameters have a significant influence to the macroscopic mechanical properties of cohesive soil by analyzing the stress—strain curves. This mesoscopic parameters include boundary conditions, porosity ,bonding strength, friction coefficient ,contact stiffness and so on. The law of the influence had been discussed and it provides a valuable reference to the particles flow numerical simulation of triaxial test for the future.

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邢炜杰,余湘娟,高 磊,等. 基于颗粒流离散元的粘性土三轴剪切试验数值模拟[J]. 科学技术与工程, 2017, 17(35): .
Xing Wei-jie, Yu Xiang-juan,,et al. Numerical simulation of cohesive soil triaxial shear test based on particle flow discrete element[J]. Science Technology and Engineering,2017,17(35).

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历史
  • 收稿日期:2017-05-03
  • 最后修改日期:2017-06-22
  • 录用日期:2017-07-21
  • 在线发布日期: 2017-12-27
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