中文摘要：

由于节理、断层等不连续面的存在造成岩体变形的不连续性，并且这些不连续面对岩体变形、应力等力学行为造成重要影响。对已有的非连续变形分析程序进行了两点改进，应用改进的程序模拟了节理岩体中隧洞开挖与支护的过程，研究了不同节理倾角岩体的应力分布特性、开挖后隧洞围岩的变形和应力分布规律以及支护后衬砌的变形与应力特点。研究结果表明，节理倾角对节理岩体系统的应力和变形有着直接的影响，并且影响着隧洞开挖后的内空收敛效应；隧洞开挖顺序对围岩的变形和稳定也有重要影响。改进后的非连续变形分析方法和程序可以用来分析复杂节理岩体系统中隧洞的开挖与支护。

英文摘要：

The mechanical behaviors of the jointed rock masses during tunneling and lining are simulated using discontinuous deformation analysis （DDA）. Two improvements for tunneling and lining are developed and implemented into the original DDA program and the process of the tunneling and lining are simulated using the advanced program. The influence of the joint direction on the deformation and the stresses distribution of the jointed rock masses are investigated during tunneling and lining. The effect of the excavation sequence on the stability of the rock around the tunnel is also simulated. From this study, it is found that the joint direction has primary impact on the deformation and the stress distribution. The excavation sequence has also impact on the deformation and the stability of rock masses. These results suggest that the advanced DDA can be applied to simulate the tunneling and lining behaviors of the complicated discontinuous rock masses.