应力主轴旋转平面方位对粒状介质变形的影响

doi:10.13722/j.cnki.jrme.2017.1488

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摘要利用离散元法，通过力线柔性边界的方式，实现了主应力在横观各向同性粒状介质试样任意平面内的旋转。在不同应力主轴旋转面与试样沉积面夹角θ下，试样均产生累积性体缩，且θ影响着试样在不同中主应力系数下体应变的相对大小。θ = 0°时，试样在应力主轴旋转面内各向同性，其体应变、应变增量方向与应力方向非共轴角、颗粒平均配位数均不随主应力旋转而周期性波动。试样在应力主轴旋转面内正应变的累积方向随θ的变化而调整。颗粒主接触方向与主应力方向是否同步可能是诸多宏观量是否波动的细观原因之一，且该同步性受θ影响较大。

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	薛龙1
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	王睿1
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	张建民1
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关键词 ：土力学, 应力主轴旋转平面, 离散元, 各向异性, 中主应力系数

Abstract：Using 3D discrete element method with force-line flexible boundary，principal stress axes rotation (PSAR) loading is achieved in arbitrary plane of cross-anisotropic granular matter. Volume strain is always contractive for various θ，the angle between the specimen?s bedding plane and the PSAR plane，and its relative magnitude varies under different intermediate principal stress coefficients. When θ = 0°， the fluctuation of the volume strain，the non-coaxial angle between the strain increment direction and the principal stress direction，and the coordination number of the specimen disappears，as the specimen is “inherently isotropic” in the PSAR plane. The direction of the normal strain in the PSAR plane changes for various θ. The relationship between the principal contact normal fabric orientation and the principal stress orientation is a likely explanation of the fluctuation of the macroscopic quantities，which is strongly influenced by θ.

Key words： soil mechanics principal stress axes rotation plane discrete element method(DEM) anisotropy intermediate principal stress coefficient

引用本文:

薛龙1，2，王睿1，2，张建民1，2. 应力主轴旋转平面方位对粒状介质变形的影响[J]. 岩石力学与工程学报, 2019, 38(S1): 3114-3123.
XUE Long1，2，WANG Rui1，2，ZHANG Jianmin1，2. Influence of the orientation of the principal stress axes rotation plane on deformation of granular matter. , 2019, 38(S1): 3114-3123.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1488 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/3114

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