不同埋深盾构双隧道及开挖顺序对临近管线的影响研究

发布时间：2018-02-04 17:27

本文关键词： 三维离心模型试验三维数值模拟双隧道开挖顺序隧道-管-土相互作用　出处：《岩土力学》2017年09期 　论文类型：期刊论文

【摘要】：以不同埋深双隧道、不同开挖顺序对临近地埋管线的影响为研究目的,在离心模型试验中同时考虑隧道开挖所致地层损失效应和质量损失效应,并采用考虑土体非线性小应变特性的HP(Hypoplasticity亚塑性)模型和基于地层损失比的位移控制法进行有限元模拟分析。研究结果表明,不同埋深双隧道、不同开挖顺序对地表沉降、管线沉降及管线弯曲应变的影响较大。双隧道开挖完成后管线下凸区(管线底部受拉区)分布范围为-2.5D_T~1.5D_T(DT为隧道外径),且管线下凸区最大弯曲应变约为管线上凸区(管线底部受压区)最大弯曲应变的2倍。不应简单采用叠加原理对不同埋深先后开挖双隧道所致地表沉降、管线沉降及管线弯曲应变进行预测,应合理考虑后继隧道开挖所致土体的累积剪切应变及管-土相对刚度对预测结果的影响。
[Abstract]:For the purpose of studying the influence of different buried depth and different excavation sequence on the adjacent buried pipe line, the formation loss effect and mass loss effect caused by tunnel excavation are considered in centrifuge model test. HP(Hypoplasticity subplastic model considering nonlinear small strain characteristics of soil mass and displacement control method based on formation loss ratio are used to simulate the model. The results show that. Different buried depth of double tunnel, different excavation sequence on the surface settlement. The influence of pipeline settlement and pipeline bending strain is great. After the double tunnel excavation is completed, the distribution range of the protruding zone (tension zone at the bottom of the pipeline) is -2.5 DV / T / T / 1.5 D / T _ T _ T _ T _ T _ T _ T _ T _ (DT) is the outer diameter of the tunnel. And the maximum bending strain of the convex zone under the pipeline is about 2 times that of the maximum bending strain in the upper convex zone of the pipeline (the pressure zone at the bottom of the pipeline). The superposition principle should not be used simply for the surface settlement caused by the excavation of double tunnels with different buried depths. In order to predict pipeline settlement and pipeline bending strain, the influence of cumulative shear strain of soil caused by subsequent tunnel excavation and the relative stiffness of pipe-soil on the prediction results should be considered reasonably.
【作者单位】：广西大学土木建筑工程学院;广西大学工程防灾与结构安全重点实验室;广西科技大学土木建筑工程学院;
【基金】：国家自然科学基金(No.41362016,No.51678166,No.51508113) 广西岩土力学与工程重点实验室资助课题(No.13-KF-02)~~
【分类号】：TU990.3;U455.43
【正文快照】： 地铁隧道的施工将不可避免地导致周围土体位移及应力松弛,从而使得临近管线产生过大的附加沉降和弯曲应变。受隧道开挖影响的地埋管线能否正常、安全地服役,已成为学者关注的重点。解析法常被用于隧道开挖对既有地埋管线的影响研究[1-3]。近期,Klar等[4]采用连续弹性理论推导

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