引汉济渭工程秦岭隧洞围岩稳定性有限元分析

发布时间：2018-07-11 14:52

  本文选题：秦岭引水隧洞 + 围岩　； 参考：《水利水电技术》2017年08期

【摘要】：对引汉济渭工程秦岭引水隧洞开挖的初期支护施工过程围岩结构的塑性变形分布规律进行分析研究,结合计算结果,为初期支护过程围岩的稳定性提供分析依据,以便对现场施工提供合理化建议。采用非线性弹塑性有限元法,依据地下结构设计理论及岩石的Drucker-Prager屈服准则,考虑围岩和初期支护衬砌结构的整体性,对秦岭引水隧洞的Ⅲ、Ⅳ类围岩开挖和初期支护结构的施工过程进行了模拟,计算了开挖施工过程三种不同工况下围岩顶拱及侧向的塑性变形。结果表明:秦岭隧洞初期支护施工过程的三种工况下围岩结构的塑性变形主要集中在顶拱120°范围内及两侧边墙,隧洞围岩结构整体处于安全状态。
[Abstract]:The distribution law of plastic deformation of surrounding rock structure during the initial supporting construction process of Qinling diversion tunnel excavation in Hanji-Jiwei project is analyzed and studied. The stability of surrounding rock during the initial supporting process is analyzed by combining the calculation results. In order to provide reasonable suggestions for site construction. Based on the theory of underground structure design and Drucker-Prager yield criterion of rock, the nonlinear elastic-plastic finite element method is used to analyze the integrity of surrounding rock and initial supporting lining structure. The excavation process of type 鈪，

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