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工程实践中大量的浅埋隧道位于软硬非匀质地层之中,笔者对该类隧道台阶法施工下穿高速公路段地表沉降控制措施进行了一系列研究。首先从已建的该类工程地表沉降实测数据入手,在计算机中仿真模拟出整个动态施工过程,反推出数值模型的各个计算参数,确保该模型的可靠度,然后利用该模型进行虚拟工况开挖模拟计算,分别对双层管棚法、双层初期支护等施工措施对地表下沉的控制效果进行了评价。
A large number of shallow tunnels in engineering practice are located in soft and hard non-homogeneous strata. The author conducted a series of researches on the control measures for surface subsidence of expressways under the construction of such tunnel steps. First of all, based on the measured ground subsidence data of the existing projects, this paper simulates and simulates the entire dynamic construction process in the computer, and deduces the calculation parameters of the numerical model to ensure the reliability of the model. Then, Digging simulation calculation, respectively, on the double pipe shed method, double initial support and other construction measures on the surface subsidence control effect was evaluated.