Abstract
The excavation of a shallow buried tunnel may cause stress redistribution in surrounding rock, and cause deformation, damage, and even destruction of adjacent underground pipelines. The land part of the Haicang undersea tunnel in Xiamen of China was a super shallow buried large span double-arch tunnel. Its construction was restricted by both underground excavation safe and adjacent pipeline protection. Multiple groups of working conditions were designed considering the relative position of pipe and tunnel, pipeline and tunnel construction parameters. Numerical simulation was used to study the influence of pipeline horizontal distance, buried depth, pipeline diameter, pipeline wall thickness, pipeline shape, pipeline material and excavation method on the response of adjacent underground pipelines. The results show that the relative position of pipe and tunnel, and the construction method of the double-arch tunnel have a great influence on pipeline deformation. Pipeline material, pipeline diameter and excavation method have a great influence on pipeline stress. The construction method was the key factor affecting the stress and deformation of the pipeline. The three-step reserved core soil method can effectively control the stress and deformation of underground pipelines. The research results can provide a reference for similar projects.
Highlights
When highway tunnels pass through urban areas, they often face problems such as tight land use, fragile geological environment, and high sensitivity of the surrounding environment
Due to a large number of underground pipelines in urban areas, the underground excavation causes stress redistribution in surrounding rock and soil, which inevitably affects the deformation of land surface and surrounding pipelines
Yu et al [28] performed numerical simulations, the results show that when the position of the municipal pipeline and subway tunnel was vertical, the displacement of the pipeline was less than the horizontal displacement, while the stress of the pipeline was opposite
Summary
When highway tunnels pass through urban areas, they often face problems such as tight land use, fragile geological environment, and high sensitivity of the surrounding environment. Based on Winkler elastic foundation beam theory, Attewell [8] proposed an analysis and calculation model of pipeline deformation caused by stratum movement induced by tunnel excavation, and analyzed the joint angle and bending stress of the pipeline when the pipeline moved perpendicular to the parallel stratum. The three-dimensional finite element analysis model was established by using the finite-difference software, and Guo et al [26] simulated the influence of double pipe parallel tunnel excavation with different buried depth, material properties and diameter on underground pipelines. Seldom focused on the response of the adjacent underground pipelines to a super shallow buried large span double-arch tunnel excavation during excavation where pipeline protection was vital for tunnel construction. Taking the Haicang tunnel in Xiamen of China as the background, the responses of adjacent underground pipeline to the excavation of a super shallow buried large span double-arch were studied by using numerical simulation method. D is the diameter; ip is the distance of the reverse bend point on the pipeline [35]
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