【摘要】 为了更符合实际工程,拓展非连续变形分析(DDA)的应用范围,将DDA中自带的平面应力问题转换为平面应变问题,对平面应变模型进行算法分析,并在VC++平台下程序实现;将岩体DDA方法平面应变模型应用于大型地下洞室开挖,并将模拟结果与已有大型洞室的物理实验结果进行对比。研究结果表明:DDA方法中平面应力模型的改进可行,与物理试验结果吻合度较好;洞室围岩的破坏与开挖的关系密切;DDA方法平面应变模型应用于大型地下工程,可以更好地分析洞室围岩的稳定性。更多还原

【Abstract】 In order to reflect the real rock engineering and expand the application range of discontinuous deformation analysis(DDA), the plane strain problem was considered, and its algorithm was analyzed and programmed based on VC++ platform. The plane strain model was applied to analyze the cavern excavation for large underground engineering. The results show that the algorithm of DDA is feasible and consistent with the results of laboratory tests well, and surrounding rock masses’ failure is related with the excavation process to a large degree. DDA plane strain model can be used to analyze the stability of cavern’s surrounding rock masses well.更多还原