隧道盾构施工引起土体力学效应的计算分析

随着市政建设的快速发展，地铁盾构越来越多的穿越密集的建（筑）物和地下管线，隧道施工对周围环境的影响已经引起人们足够的重视。视隧道开挖引起的土体移动为一随机过程，应用随机介质理论，根据土体损失的空间分布规律，得到土体损失引起的位移计算公式；在此基础上，结合弹性理论基本方程推导了隧道开挖引起周围土体应力变化的计算公式。最后，结合算例，对盾构推进过程中引起的土体位移和附加应力分别进行计算，旨在了解盾构施工引起的环境力学效应，为采取措施减小这种影响提供依据。

Calculation and analysis of construction mechanics effect due to tunnel construction by shield

With the development of municipal engineering, shield tunneling has been used in various kinds of underground constructions and underlines more popularly in urban area. Much more attention should be paid to the effect of tunnel construction on close environment. According to the space regularities of distribution of ground loss and by stochastic medium theory, it is assumed that ground movement process is of the property of stochastic process, and the soil displacement due to ground loss can be calculated. Combining with the basic elastic equations, the stress changes due to tunnel excavation can be calculated. Finally, with the help of computer programs, the soil displacement and superimposed stress are analyzed, which can help researchers to understand the environment effect of construction. And at the same time, these results can make(be of great help ) for in-situ engineers to make decisions on their own on these effects in advance.