基于统一强度理论分析不连续面对岩体强度的影响

Analysis of influence of discontinuous plane on strength of rock mass based on unified strength theory

基于统一强度理论,对含有结构面的岩体,在平面形式下引入材料统一强度参数ct,φt,推导了含单个节理裂隙岩体材料的统一强度公式,即考虑中间主应力的岩体破坏强度公式,并分析了其有效范围。运用硅藻质软岩和石膏的三轴试验结果,验证了所建立的公式的正确性,并分析了具有不连续面岩体的强度随中间主剪应力作用系数b的变化。结果表明,岩体强度随b值的增大而增大。根据岩土材料统一强度参数的确定方法,计算并分析了b值对强度参数的影响,从而说明强度参数随着b值的变化而变化。

Based on unified strength theory, considering condition of plane style of rock mass with discontinuous plane, the unified strength formulation for strength of rock mass with single joint, i.e. failure criterion of rock mass of considering the intermediate principal stress, is derived by introducing unified strength parameters ct and φt of material; and the effective range of formulation is analyzed. The proposed formulation is verified by triaxial experiments of diatomaceous soft rock and gypsum; and the change of strength of rock mass with the variation of parameter b of intermediate principal shear stress is analyzed; and the results show that the strength increases with the increasing of parameter b. The parameters ct and φt are calculated and analyzed in term of determination method of parameters ct and φt of geomaterial; and note that they change with parameter b.