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提出近距离双线水平平行盾构施工引起的总的地表沉降曲线符合正态分布规律。基于单线随机介质理论简化公式,针对现有不足,建立修正的随机介质理论简化计算公式,可以计算近距离双线平行盾构施工引起的地表沉降,同时能够考虑沉降曲线的不对称性,对计算参数取值进行了探讨。算例分析结果表明,文中方法预测值与实测值比较吻合,且计算比较简便。实测数据统计结果表明,先行隧道开挖后双线隧道的半径收敛值比先行隧道半径收敛值要大,而主要影响角则变小;提出可直接用于近距离界定的式(6),认为双线隧道的地表沉降曲线形状与P值大小有关,近距离的界定范围为P≤1.1。
It is proposed that the total surface subsidence curve caused by the construction of close-range double-line horizontal parallel shields meets the normal distribution rule. Based on the simplified theory of single-line stochastic medium, aiming at the existing shortcomings, a simplified theoretical formula of modified stochastic medium is established, which can calculate the settlement of ground surface caused by the construction of two-line parallel shield. At the same time, considering the asymmetry of settlement curve, Parameter values were discussed. The results of the example analysis show that the predicted value of the method in the paper is in good agreement with the measured value, and the calculation is relatively simple. The experimental results show that the convergence radius of double-track tunnel is larger than that of previous tunnel and the main influence angle is smaller. The formula (6) which can be directly used for short-range definition is proposed The shape of the surface subsidence curve of the double-track tunnel is related to the P value, and the range of the short distance is P≤1.1.