互层状岩体的粘弹性流变模型及数值分析

Viscoelastic Rheological Model for Interlayered Rock Mass and Its Numerical Analysis

摘要:

以绿片岩和大理岩互层的层状岩体为研究对象，分别建立单轴轴向压缩荷载垂直和平行于层理时的两种互层状岩体粘弹性流变模型，采用有限差分程序FLAC3D对互层状岩体进行了单轴压缩蠕变试验的数值分析，将轴向应变的数值解与理论解进行对比,验证这两种模型的正确性.在数值分析中考虑大理岩夹层的体积分数、深度、条数和间距等对数值计算结果的影响.研究结果表明，轴向应变的数值解与理论解比较接近，说明提出的两种互层状岩体粘弹性流变模型是正确的.当进行单轴压缩蠕变试验的数值分析时，轴向应变理论解与数值解的误差随着大理岩夹层的深度、条数和间距等的改变呈规律性的增加或者减小.

Abstract:

A study was made of the interlayered rock mass composed of greenschist and marble;two viscoelastic rheological models were built with axial uniaxial loading orientation perpendicular or parallel to bedding plane.The numerical analysis of uniaxial compression creep test for interlayered rock mass was done by using finite difference program FLAC3D, and these two viscoealstic rheological models were verified by the comparison between theoretical value and numerical value of axial strain.Lots of influencing factors such as the volumetric content,depth,amount and interval of marble interlayer were taken into account in the numerical analysis.The research results show that the numerical value matches the theoretical value well,therefore,these two viscoelastic rheological models are available and reasonable.The error between the numerical value and theoretical value will increase or drecrease regularly with the change of the depth,amount and interval of marble interlayer.