地铁盾构隧道下穿覆土中雨污管线影响 分析

With the rapid development of urban rail transit network, a large number of shield tunnel construction under the municipal pipeline. The shield tunneling excavation causing the unloading of neighborhood soil, inevitable role in the municipal pipeline. In this paper, the numerical simulation method has been applied, a detailed analysis on the disaster mechanism of large diameter pipes due to metro project, based on typical metro project in Beijing metro line 7. The calculation results show that the vertical displacement is greater than the horizontal displacement, the differential settlement of pipeline, main influencing factor, resulted in destruction of pipes. when the shield tunnel and pipeline were orthogonal, the pipe section above the shield tunnel was pressing by the left and right sides pipe section, the tensile stress is concentrated in the directly above of the shield tunnel, which is the weakest part of the whole line; when the shield tunnel and pipeline were parallel, the deformation of pipeline is inclined to the shield tunnel excavation face. The results of this paper has certain reference significance for the design and construction of the relevant engineering.