微结构张量改进的强度准则在白鹤滩水电站柱状理各向异性分析中的应用

the problem relation to rock mass structure is core issues in the rock mass engineering. Complicated material fabrics are the main factors to control the mechanic characteristics of rock mass, currently the anisotropic problems caused by structural planes are the most written topics. As a special structure rock mass, the discontinuity and anisotropy of rock mass with columnar joints is very typical, but it’s not widely exist so that the research in the columnar joints is still in its starting stage. The microstructure can be represented by a second order tensor whose eigenvectors specify the orientation of the axes of material symmetry, which is an effective new method to study structure plane caused anisotropy. In this paper, a modified anisotropic failure criterion, which incorporating a microstructure for columnar joints based on Jaeger proposed for failure along the material fabrics, is used to study the columnar joints anisotropy. Meanwhile, use it to consider the Baihetan hydropower station columnar joint- project and analysis columnar joint anisotropy caused stability problem.