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为了同时考虑隧道开挖的时空效应,以某高速公路隧道开挖支护工程为背景,通过现场围岩的变形监测分析,探讨了围岩与衬砌的相互关系。利用理论推导方法建立了同时考虑时空效应的隧道围岩变形修正计算公式,该公式包含了时间参数,可确定达到不同衬砌位移及围岩位移所需要的时间。然后,针对隧道拱顶下沉、周边收敛、围岩压力和初衬内力,开展了隧道二衬合理支护时机的监测分析,从而确定了围岩变形修正公式中的待定系数,并最终确定隧道衬砌的合理支护时机,得到的结果能够指导现场施工并为后续类似的隧道工程提供参考和借鉴。
In order to consider the space-time effect of tunnel excavation at the same time, with the tunnel excavation support engineering as a background, through the deformation monitoring analysis of the surrounding rock, the relationship between the surrounding rock and the lining is discussed. The formulas for calculating the deformation of tunnel surrounding rock considering the space-time effect are established by using the theoretical derivation method. The formula includes the time parameters to determine the time required to reach different lining displacements and displacement of the surrounding rock. Then, in view of the settlement of tunnel vault, the surrounding convergence, the pressure of surrounding rock and the initial lining internal force, the monitoring and analysis of the timing of reasonable support of tunnel lining is carried out, and the undetermined coefficient in the formula of surrounding rock deformation correction is determined and finally the tunnel Lining reasonable support opportunities, the results obtained can guide the construction site and for subsequent similar tunneling projects provide reference and reference.