接头渗漏和土体渗透各向异性对盾构隧道渗流影响的数值模拟  

Numerical simulation of influence of joint leakage and soil permeability anisotropy on seepage of shield tunnel

作　　者：张晓[1,2] 周建[1,2] 蒋熠诚 HORRIS K N ZHANG Xiao;ZHOU Jian;JIANG Yicheng;HORRIS K N(Coastal and Urban Geotechnical Engineering Research Center,Zhejiang University,Hangzhou 310058,China;Zhejiang Urban Underground Space Development Engineering Research Center,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学浙江省城市地下空间开发工程技术研究中心,浙江杭州310058

出　　处：《中南大学学报（自然科学版）》2023年第3期1012-1022,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51338009);国家重点研发计划项目(2016YFC0800203)。

摘　　要：为了研究土体渗透各向异性对盾构隧道渗漏的影响,以上海地铁1号线为工程背景,首先,通过有限元数值软件,建立盾构隧道接头渗漏的计算模型;其次,将计算结果与解析解对比,验证数值模型的可靠性;再次,探究不同渗漏位置以及土体渗透各向异性比下,地下水渗入隧道对地表沉降以及隧道位移的影响;最后,提出不同渗漏位置下土体的临界渗透各向异性比。研究结果表明:对于修建于饱和软土地区的盾构隧道,土体渗透各向异性对地表以及隧道的影响与渗漏位置密切相关,隧道全部接头渗漏、仅上部接头渗漏、仅中部接头渗漏和仅底部接头渗漏等工况下,临界渗透各向异性比分别为1.6,1.1,1.3和1.4。当土体渗透各向异性比超过临界值时,需要考虑渗透各向异性的影响。当隧道全部接头渗漏时,忽略渗透各向异性会高估隧道以及地表的沉降,低估地表沉降槽的范围;当仅有一个接头渗漏时,忽略渗透各向异性会低估隧道的沉降、偏移、地表沉降以及地表沉降槽的范围。In order to study the influence of joint leakage and soil permeability anisotropy on shield tunnel leakage,Shanghai Metro Line 1 was taken as the engineering background.Firstly,finite element method was employed,and a numerical calculation model of leakage through shield tunnel joints was established.Secondly,compared with the analytical solution,the reliability of the model was verified.Thirdly,the influence of tunnel leakage on ground settlement and tunnel displacement at different leakage locations and soil permeability anisotropy ratios was explored.Finally,the critical soil permeability anisotropy ratios at different leakage positions were proposed.The results show that the impact of soil permeability anisotropy on the shield tunnel which is constructed in the saturated soft soil layer is related to the leakage location.The critical permeability anisotropy ratios under conditions of leakage at all joints,the upper joint,the middle joint and the bottom joint are 1.6,1.1,1.3 and 1.4,respectively.When the soil permeability anisotropy ratio exceeds the critical value,the influence of permeability anisotropy needs to be considered.When leakage occurs at all joints,ignoring the permeability anisotropy will overestimate the tunnel settlement and ground settlement,and underestimate the range of ground settlement trough.When leakage occurs at a single joint,ignoring the permeability anisotropy will underestimate the tunnel settlement,tunnel lateral displacement,ground settlement and the range of ground settlement trough.

关 键 词：渗透各向异性 盾构隧道 接头渗漏 有限元 

分 类 号：U45[建筑科学—桥梁与隧道工程]