富水圆砾地层地铁盾构隧道施工对既有管线变形影响规律分析  

Influence Law of Shield Tunnel Construction on Existing Pipelines in Rich Water Gravel Stratum

作　　者：高涛[1] GAO Tao(Beijing Urban Construction Survey and Design Institute Co., Ltd.,100101, Beijing, China)

机构地区：[1]北京城建勘测设计研究院有限责任公司

出　　处：《城市轨道交通研究》2019年第7期116-119,共4页Urban Mass Transit

摘　　要：以南宁轨道交通2号线某区间盾构双线隧道先后通过与隧道间距不同的管线为工程背景,通过FLAC软件数值计算和现场监测相结合的方法研究了富水圆砾地层地铁盾构隧道施工对既有临近管线变形的影响规律。结果表明:随着地层深度增加,沉降槽宽度减小;管线最大沉降量出现在左线隧道中线上方;盾构刀盘通过2倍盾构外径范围后,管线沉降逐渐趋于稳定;管线沉降曲线受右线隧道开挖影响不再符合高斯曲线,同时管线最大拉应力呈增加趋势,而最大压应力呈减小趋势。研究结果可为类似工况下地铁盾构隧道的安全施工提供参考。Taking the shield double-line tunnel of a section on Nanning rail transit Line2 as the engineering background, which passes through pipelines with different distances from the tunnel, FLAC software numerical calculation method and on-site monitoring are combined to study the influence law of metro tunneling in rich water gravel formation on the deformation of adjacent pipelines.The results show that as the depth of the formation increases, the settlement tank width will decrease;the maximum settlement of the pipeline appears above the central line in the left-line tunnel;the settlement of the cutter head gradually becomes stable after passing2 times range of the external shield diameter;the settlement curve of the pipeline then conforms no longer to the Gaussian curve because of the tunnel excavation on the right-line.At the same time, the maximum tensile stress of the pipeline increases, and the maximum tensile stress decreases.The research results provide references for the safe shield construction of metro tunnel under similar conditions.

关 键 词：地铁 盾构隧道施工 富水圆砾地层 既有管线变形 现场监测 数值模拟计算 

分 类 号：U455[建筑科学—桥梁与隧道工程] U231[交通运输工程—道路与铁道工程]