地下连续墙施工对附近埋地管道影响分析  

Analysis of Impact of Underground Continuous Wall Construction on Nearby Buried Pipelines

作　　者：逄凯 PANG Kai(CNOOC Safety Technology&Services Co.,LTD.)

机构地区：[1]中海油安全技术服务有限公司

出　　处：《管道技术与设备》2024年第6期15-19,36,共6页Pipeline Technique and Equipment

摘　　要：以妈湾跨海通道主线隧道深基坑工程为例,分析深基坑地下连续墙施工对附近埋地高压天然气管道安全影响。地下连续墙成槽施工过程中,可能发生局部垮塌,且埋地天然气管道距离地下连续墙仅5.5 m。采用MIDAS GTS建立管土有限元模型,对地下连续墙施工后基坑开挖过程和地下连续墙成槽局部垮塌状态进行数值计算,判定成槽局部垮塌对埋地管道的影响并提出管道局部变形控制限值条件,分析基坑开挖后管道应力和位移状态。建议在深基坑开挖段管道附近进行位移监测,位移预警值设为10 mm,同时管道位移监测的控制条件可取管道水平和竖向挠跨比为0.4‰,为类似工程提供参考。Taking the deep foundation pit project of the Mawan Cross Sea Tunnel as an example,the safety impact of underground 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.

关 键 词：深基坑 地下连续墙 MIDAS GTS 埋地管道 

分 类 号：TE973[石油与天然气工程—石油机械设备]