隧道下穿引起管线非线性变形的简化计算方法

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中图分类号：U455.7；TU470.3 文献标志码：A 文章编号：2096-6717（2025）06-0114-09

Abstract： The construction of urban subways involves undercrosing existing municipal pipelines，which may threaten pipeline safety.Most of the existing prediction theories for pipeline deformation use elastic foundation models such as the Winkler model and the Pasternak model，which cannot account for the nonlinear deformation characteristics of soil.Therefore，an existing municipal pipeline with rigid joints was regarded as acontinuous beam on a nonlinear foundation and a nonlinear deformation prediction method for pipelines was established. Firstly，the ground displacement along the axis of the pipeline caused by single-line and double-line tuneling Was calculated respectively，using the Peck empirical formula and the modified Peck empirical formula that considers the tunnel construction sequence.Then，the diffrential governing equation for pipeline deformation caused by tunneling was established，and the deformation solution of the pipeline Was obtained using the finite diference method and the Newton iteration method.Finally，the rationalityand applicability of the proposed method were verified by comparing its results with monitoring data from a centrifuge experiment and two engineering cases.The results show that the proposed method is in beter agreement with the measured data compared with other foundation models such as the Winkler model，Pasternak model，and Kerr model. It can also predict the pipeline deformation caused by twin-tunnelundercrossing while considering the efectof tunnel construction sequence.

Keywords： twin-tunnel； tunnel undercrossing；pipeline with rigid joints；nonlinear foundation； theoretical analysis

据统计，到2021年底，中国有42座城市开通地铁与市域快轨，其中6座城市的地铁里程位居全球前十行列，且保持快速增长[。（剩余13990字）