不同隧道位移边界和土体损失对上卧管线的影响  

Effect of different displacement boundary conditions and soil loss on underground pipeline

作　　者：余景良[1] 孙廉威[2] 晁春峰 

机构地区：[1]广州航海学院航务工程学院,广东广州510725 [2]浙江大学建筑工程学院,浙江杭州310058 [3]浙江省交通运输科学研究院,浙江杭州310006 [4]桥梁无损检测与工程计算四川省高校重点实验室,四川自贡643000

出　　处：《合肥工业大学学报（自然科学版）》2016年第10期1389-1396,共8页Journal of Hefei University of Technology：Natural Science

基　　金：四川省高校重点实验室开放基金资助项目(2014QZJ05)

摘　　要：盾构隧道掘进对地表以及构筑物的影响主要是由掘进过程中土体损失引起的。前人在地铁盾构隧道开挖对地下管线的影响分析大多是基于三维的隧道开挖模型,隧道开挖引起的土体损失采用强度折减法或者假定一定的土体受损率。文章基于Park提出的隧道周边4种径向位移边界条件,以某实际工程为例建立二维隧道与管线的相互作用模型,讨论不同位移边界条件以及不同土体损失情况下,隧道开挖对管线的影响,对椭圆化位移边界条件和均匀位移边界条件进行比较分析。结果表明,椭圆化位移边界条件更接近实际,同时为了保证上部构筑物的安全,盾构掘进时土体损失率尽量控制在0.5%以内,并且可以对管线进行适当的注浆。The previous research on the influence of shield tunnel excavation on underground pipeline is primarily based on the 3D model of tunnel excavation, and the strength reduction method is applied to the soil loss during the tunnel excavation or a certain soil loss rate is assumed. In fact, the soil loss during shield tunnel excavation is an important factor influencing the underground structures. In this paper, taking a practical project as an example, and based on the four radial displacement boundary conditions proposed by Park, the 2D model of the interaction between tunnel and pipeline is estab- lished to discuss the effect of tunnel excavation under different soil loss and boundary conditions on the pipeline. And the elliptical displacement boundary conditions and homogeneous displacement boundary conditions are compared. The results show that the elliptical displacement boundary condi- tions are more reasonable and the rate of soil loss should be controlled within 0. 5 % to ensure the safety of pipeline. And the appropriate grouting can reduce the settlement of pipeline.

关 键 词：盾构隧道 地下管线 二维模型 有限元 数值模拟 

分 类 号：U451[建筑科学—桥梁与隧道工程]