Analysis of Impact of Underground Continuous Wall Construction on Nearby Buried Pipelines
Taking the deep foundation pit project of the Mawan Cross Sea Tunnel as an example,the safety impact of under-ground continuous wall construction on nearby buried high-pressure natural gas pipelines was analyzed.Local collapse might occur during the trenching construction of the underground continuous wall,and the buried natural gas pipeline was only 5.5 m away from the underground continuous wall.MIDAS GTS was used to establish a pipe soil finite element model to numerically calculate the excavation process of the foundation pit and the local collapse state of the underground continuous wall trenching after the construction of the underground continuous wall.The impact of trenching local collapse on the buried pipeline was determined,and the control limit conditions for local deformation of the pipeline were proposed.The stress and displacement state of the pipeline after excavation of the foundation pit were analyzed.It was recommended to conduct displacement monitoring near the pipeline in the excavation section of the deep foundation pit,with a displacement warning value set at 10 mm.At the same time,the control conditions for pipeline displacement monitoring can be set at a horizontal and vertical deflection span ratio of 0.4 ‰,providing reference for similar projects.
deep foundation pitunderground continuous wallMIDAS GTSburied pipeline
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NSTL
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