层状岩体单轴和双轴压缩蠕变特性的数值试验

以绿片岩和大理岩组成的层状岩体为研究对象，采用FLAC3D对互层状岩体进行了单轴和双轴压缩蠕变试验的数值分析，在数值分析中考虑荷载方向与层理之间的几何关系、大理岩夹层的体积分数、应力水平等的影响。研究结果表明:单轴和双轴压缩条件下，随着夹层倾角由0°增加至90°，轴向和夹层倾斜方向的应变绝对值均呈先增大后减小的变化规律；随着大理岩夹层体积分数的增加，轴向压缩变形和2个侧向方向的膨胀变形量均有所减小。单轴压缩条件下，当轴向荷载方向垂直于层理时，轴向压缩变形均大于轴向荷载方向平行于层理时的轴向压缩变形；双轴压缩条件下，当轴向荷载方向垂直于层理、侧向荷载方向平行于层理时，轴向压缩变形最大，当轴向荷载方向平行于层理、侧向荷载方向垂直于层理时，轴向压缩变形最小。

Numerical Analysis Study on Uniaxial and Biaxial Compression Creep Tests for Interlayered Rock Mass

Taking the interlayered rock mass composed of greenschist and marble as study subject, numerical analysis on uniaxial and biaxial compression creep tests of interlayered rock mass was done by FLAC^3D. Lots of influencing factors such as geometric relationship between loading direction and layer, volumetric content of marble interlayer and stress level were taken into account in the numerical analysis. The research results show that the absolute values of axial strain and strain in the incline direction of interlayer increased firstly and then decreased when the dip angle of interlayer increased from 0° to 90° under uniaxial and biaxial compression states. Axial compressive deformation and dilatant deformation in the two lateral directions decreased with the increased volumetric content of marble interlayer under uniaxial and biaxial compression states. The axial compressive deformation when axial loading orientation was perpendicular to bedding plane was larger than that when axial loading orientation was parallel to bedding plane under uniaxial compression. The axial compressive deformation was the largest when axial loading orientation was perpendicular to bedding plane and lateral loading orientation was parallel to bedding plane, and was the smallest when axial loading orientation was parallel to bedding plane and lateral loading orientation was perpendicular to bedding plane.