盾构深基坑对邻近变电站及电力管廊影响分析  

Analysis of Influence of Shield Deep Foundation Pit on Adjacent Substation and Power Pipe Gallery

作　　者：孙安 SUN An(Guangdong Architectural Design and Research Institute Co.,Ltd.Guangzhou 510010,China)

机构地区：[1]广东省建筑设计研究院有限公司,广州510010

出　　处：《广东土木与建筑》2022年第12期45-48,共4页Guangdong Architecture Civil Engineering

摘　　要：以市区某综合管廊盾构接收井深基坑为例,分析周边存在对变形敏感建构筑物时开挖深基坑所面临的难题。为减小深基坑施工对周边主控楼及电力管廊的影响,采用刚度大的地下连续墙和钢筋混凝土内支撑支护体系,同时周边设置搅拌桩内插钢管、减震沟、声屏障、钢保护架等。实践证明上述措施能较好起到对现有建构筑物的保护作用。针对大直径盾构偏心进洞问题,做好弧形暗梁、洞边柱、压顶梁等洞口加固措施,并采用拆除部分内支撑的方式来减小盾构进洞时邻建构筑物侧的地表沉降。有限元软件定量分析结果表明,工程施工引起主控楼及电力管廊的总位移在可控范围之内。项目可为类似工程提供有益参考。Taking the deep foundation pit of a comprehensive pipe gallery shield receiving well in the urban area as an example,analyz‐es the problems faced by the excavation of deep foundation pit when there are deformation sensitive structures around.In order to reduce the impact of the deep foundation pit construction on the surrounding main control building and power pipe gallery,the underground diaphragm wall with high rigidity and the reinforced concrete internal support support system are used.At the same time,the mixing pile embedded steel pipe,damping ditch,sound barrier,steel protection frame,etc.are set around.Practice has proved that the above measures can better protect the existing buildings and structures.In view of the eccentric entry of large diameter shield,the reinforcement measures for the portal such as arc concealed beam,tunnel side column,coping beam,etc.shall be taken,and the method of removing some internal supports shall be adopted to reduce the ground settlement at the side of adjacent buildings when the shield enters the tunnel.The quantitative analysis results of the finite element software show that the total displacement of the main control building and the power pipe gallery caused by the project construction is within the controllable range.The project can provide useful reference for similar projects.

关 键 词：地连墙 拆除部分内支撑 搅拌桩内插钢管 洞边柱 有限元 总位移 

分 类 号：TU43[建筑科学—岩土工程]