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建立了隧道穿越V级I型围岩地段的二维弹塑性有限元模型,进行施工力学的平面数值模拟,结合信息化施工监控信息及对大量的实测数据分析整理,探讨了上下台阶开挖方式对隧道中墙应力和衬砌的内力值影响。结果表明,现场各种量测数据可有效地指导施工,左右洞的施工顺序和上下台阶开挖方式均造成了中墙明显偏压,衬砌支护体系的锚杆最大拉力出现在隧道拱顶,软弱围岩应力场和位移场处于不间断的调整过程,研究成果为类似重要工程具有借鉴和指导意义。
A two-dimensional elasto-plastic finite element model of tunnel crossing Grade V surrounding rock mass was established. The plane numerical simulation of construction mechanics was carried out. Combined with the information of construction monitoring and information analysis, a large number of measured data were analyzed and sorted. Impact on wall stress and lining internal force value in tunnel. The results show that various measurement data can effectively guide the construction. The order of construction of the left and right holes and the excavation of the upper and lower steps all cause obvious bias of the middle wall. The maximum tensile force of the bolt of the lining support system appears in the tunnel vault, The stress field and displacement field of weak surrounding rock are in an uninterrupted adjustment process, and the research results have reference and guidance significance for similar important projects.