浅覆土超大泥水盾构推进与停机引起地表及深层土体联动变形实测分析  

Coupled Displacement of Deep Soil and Ground Surface Induced by Advancement and Halt of Super Large Slurry Shield Buried in Shallow Soil

作　　者：李志义 刘颖彬 钟铧炜 滕政伟 蒋思豪 孙亦厚 LI Zhiyi;LIU Yingbin;ZHONG Huawei;TENG Zhengwei;JIANG Sihao;SUN Yihou(Shanghai Urban Construction Municipal Engineering Co.,Ltd.,Shanghai 201718,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200232,China)

机构地区：[1]上海城建市政工程(集团)有限公司,上海201718 [2]同济大学地下建筑与工程系,上海200092 [3]上海隧道工程有限公司,上海200232

出　　处：《施工技术（中英文）》2023年第13期108-115,共8页Construction Technology

基　　金：上海科委“科技创新行动计划”资助项目(19511100802)。

摘　　要：浅覆土超大泥水盾构施工控制难度大且要求高。以上海北横通道超大泥水盾构施工为背景,通过现场实测,分析了浅覆土超大泥水盾构施工引起的地表变形及深层土体水平位移的变形特征与变化规律,且对施工过程中多次停机引起的土体变形响应进行了总结。结果表明:深层土体水平位移具有明显的分层现象,表现为穿越期间隧道埋深范围内的土体受挤压而向远离隧道侧变形,而隧道埋深上方的土体向盾构方向变形。浅覆土超大泥水盾构引起的地表变形大小和规律与盾构切口位置、盾尾位置以及下埋结构的存在密切相关。盾构停机和再次推进对地表竖向变形影响显著,盾构重新推进引起的最大顶升位移可达4 mm。It is difficult and high-demanding to control the construction of super large slurry shield in shallow soil.Based on the field measurement during the construction of Shanghai Beiheng Passage,this paper investigates the deformation characteristics of ground settlement deformation and horizontal displacement of deep soil caused by the advancement of super-large slurry shield in shallow overlying soil.Besides,the response of ground settlement to the shield machine halt is investigated.The results show that the horizontal displacement of soil has obvious stratification phenomenon.During the tunnel crossing,the soil within the buried depth of the tunnel is compressed and deforms away from the tunnel side while the soil above the buried depth of the tunnel deforms toward the shield direction.The ground settlement caused by the super-large slurry shield in shallow overlying soil is closely related to the incision position of the shield,the shield tail location and the existence of the underlying structure.The vertical deformation of the ground surface is affected by the shutdown and re-advance of shield.The uplift phenomenon caused by the shield re-propulsion is obvious,and the maximum uplift can reach 4 mm.

关 键 词：盾构 泥水盾构 沉降 侧向位移 浅覆土 监测 

分 类 号：U459[建筑科学—桥梁与隧道工程]