【作者】 杨海锋；

【导师】 乔春生；

【作者基本信息】 北京交通大学 ， 岩土工程， 2011， 硕士

【摘要】 摘要：大量的工程实践表明：软弱夹层对隧道围岩稳定性有着重要的影响。本文通过收集和分析前人资料以及相关研究成果,系统总结出了有关这一课题的研究现状、软软夹层的基本工程特性以及围岩应力的基本理论。本文首先利用基于有限差分的大型数值分析软件FLAC3D为平台,采用理想弹塑性应力应变关系和摩尔库伦强度准则,对已有模型试验进行数值分析计算,通过比较分析结果,对所采用的分析方法进行可行性评价；接下来,建立实际问题的三维简化模型,利用被证明是恰当的分析方法来着重研究软弱夹层的厚度变化、倾角变化、与开挖轮廓线之间距离的变化、分布位置变化以及应力场变化对隧道围岩稳定性的影响规律；最后对哈尔滨绕城高速中天恒山隧道塌方段进行了数值模拟,并分析了塌方发生的原因。本文通过数值模拟所得到的丰富的量化成果,对于含软弱夹层的地下洞室围岩稳定性分析有着重要的参考价值。更多还原

【Abstract】 ABSTRACT:It has been proved by a large number of underground engineering that the weak interbed often has decisive effect of the stability of surrounding rock mass. Based on analyzing and collecting predecessors’ materials, in this paper, a systemic summary on the research status concerning this issue and the engineering characteristic of week interbed and basic theories of surrounding rock stress have been given. The idea of use practice to practice is adopted in this paper. Firstly, by the FLAC3D, a numerical analysis software, which is based on finite difference, using the elastic-plastic constitutive law and Mohor-Coulomb failure criterion, the model trial done by predecessor have been modeled and analysis by the software of FLAC3D, besides, the result is also compared with the result of model trial in the thesis. Secondly, systematic numerical test have been carried out to study the satiability of tunnel surrounding rock with the change of thickness of the week intercalation, the change of obliquity of the week interbed, the change of the distribution of the week interbed, the change of the distance between the interbed and the limit of excavation, the change of depth of burial. What’s more, the influence of the interbed to the stability of the tunnel surrounding rock in different also have been limited in this paper. Finally, the collapse range of the Tianhengshan tunnel of the highway round the city of Haerbin, furthermore, the reason of collapse have been analysis.plentiful result have been drawn via numerical test, which have important reference value about stability analysis of underground engineering surrounding rock containing week interbed.更多还原