节理岩体强度参数的数值模拟及工程应用

Numerical simulation and engineering application of strength parameters of jointed rock mass

采用数值模拟方法模拟含不同倾角层理面的岩体在抗拉、抗压试验下的破坏过程,从受力、变形和破坏的角度出发,解释节理岩体的破坏机理。在此基础上选取一种层理结构分布明显的岩样,完成常规力学参数下的实验测试与分析,并对数值模拟结果和实验结果进行比较和相关分析。研究结果表明:随层理面倾角的增大,单轴抗压强度先减小后增大,呈"U"型变化趋势;随层理面倾角的增大,单轴抗拉强度呈递减趋势;数值模拟结果得出单轴抗压强度和抗拉强度的各向异性系数分别为0.72和0.24;数值模拟结果与试验测试数据较吻合,为实际工程中复杂节理岩体强度参数的合理确定提供了一条新的途径。

The failure process of rock mass with beddings of different dip angles in compression and tensile tests was simulated with numerical method, and the failure mechanism of rock mass was discussed through analyzing the deformation and failure. A special type of rock sample with clear bedding structure was selected and a series of laboratory tests in conventional mechanical parameters were performed. Then the correlation between numerical simulation results and experimental results was deduced and analyzed. The results show that the uniaxial compressive strength first decreases and then increases with the increase of bedding angles, showing a U-shaped trend, while the tensile strength decreases with the increase of bedding angles. The anisotropy coefficients of the uniaxial compressive strength and tensile strength of numerical simulation results are 0.72 and 0.24, respectively. The numerical simulation and test results are in good agreement, which provide a new way for reasonable determination of the strength parameters of complex jointed rock mass in practical engineering.