地铁暗挖隧道下穿既有电力隧道施工过程位移响应  

Displacement Response of Existing Electric Tunnel Down-traversed by Metro Tunnel Excavated

作　　者：郭艳芳 王学民 杨鹏志 王蓉蓉 

机构地区：[1]河北水利电力学院,河北沧州061001

出　　处：《公路工程》2017年第4期91-94,101,共5页Highway Engineering

基　　金：国家自然科学基金项目(51008015)

摘　　要：轨道交通在促进城市区域发展和缓解交通压力方面的贡献越来越显著,暗挖隧道施工不可避免对周边管线产生扰动。选取黄土地层地铁区间近距离下穿某电力隧道为工程背景,采用过有限元差分程序FLAC^(3D)建立三维数值模型,对地铁区间隧道下穿既有管线位移响应进行研究,并与现场实测位移数据进行对比。数值计算与现场实测的地表沉降曲线基本一致。区间隧道开挖引发的地表沉降曲线仍符合Peck曲线分布,地表沉降位移最大值约为26.1 mm。地表沉降曲线为左、右线隧道施工扰动的叠加,电力隧道竖向位移最大值为12.6mm,满足产权单位提出的20 mm的位移控制标准。区间隧道施工应遵循超前支护,短进尺、强支护、勤量测、紧封闭,确保隧道施工安全和电力隧道正常使用。It has done remarkable contribution to develop city regional and relieve traffic pressure of urban tail transit, the disturbance of peripheral pipe lines are produced inevitably by metro tunnel ex- cavation. Taking the existing electric tunnel down-traversed by metro tunnel excavated in loess as the pro- ject background, the displacement response is analyzed by 3D numerical analysis of FLAC3D, the result is compared with site monitoring. The ground settlement curve is consistent with numerical calculation and site monitoring. The ground settlement curve is showed Peek curve distribution, and the maximum value is 26. 1 mm. The ground settlement curve is stacked of construction disturbance by the left line and right line tunnel. The maximum vertical displacement is 12.6 mm of the existing electric tunnel ; it is sat- isfied with displacement control standard （20 mm） of unit property right. The interval tunnel construction should follow pre-support, short footage, strong support, frequent measure and tight closing, and ensure the construction safety and normal use of existing electric tunnel.

关 键 词：黄土 暗挖隧道 下穿 既有电力隧道 三维数值分析 现场实测 位移响应 

分 类 号：TU443[建筑科学—岩土工程]