高地下水复杂地层盾构隧洞围岩渗透系数及外水荷载的反演分析  

Inversion Analysis of Surrounding Rock Permeability Coefficient and External Water Load of Shield Tunnel in Complex Stratum with High Groundwater Table

作　　者：康凯[1] 王正中[1] 董鹏 刘彪 刘铨鸿[1] 曹林顺 KANG Kai;WANG Zhengzhong;DONG Peng;LIU Biao;LIU Quanhong;CAO Linshun(Cold and Arid Regions Water Engineering Safety Research Center,Northwest A&F University,Yangling,Shaanxi 712100,China;Hanjiang-to-Weihe River Water Diversion Project Construction Co.,Ltd.,Xi’an,Shaanxi 710010,China)

机构地区：[1]西北农林科技大学旱区寒区水工程安全研究中心,陕西杨凌712100 [2]陕西省引汉济渭工程建设有限公司,陕西西安710010

出　　处：《水利与建筑工程学报》2022年第5期35-41,共7页Journal of Water Resources and Architectural Engineering

基　　金：陕西省水利科技计划项目(2021slkj-1)。

摘　　要：引汉济渭二期工程南干线神禾塬隧洞、少陵塬隧洞、白鹿塬隧洞位于高地下水复杂地层中,隧洞开挖后围岩渗流场将发生重分布,因此,准确反演围岩渗透系数和计算衬砌外水荷载是隧洞衬砌结构设计与分析的基础。为此,采用ABAQUS对引汉济渭二期工程南干线典型隧洞开挖后围岩的渗流场分布规律进行了反演分析。结果表明:隧洞开挖后洞周5m范围内孔隙水压力的重分布较为明显;当神禾塬隧洞、少陵塬隧洞、白鹿塬隧洞围岩的渗透系数分别为3.0×10^(-7)m/s、4.0×10^(-7)m/s、4.0×10^(-8)m/s时,所得开挖后渗流量与地勘报告提供的涌水量最为接近;作用于神禾塬隧洞、少陵塬隧洞、白鹿塬隧洞衬砌的外水荷载分别为0.071MPa、0.081MPa、0.252MPa。本文研究成果可为引汉济渭二期工程输水隧洞及类似工程的衬砌结构设计提供理论依据。Shenhe plateau tunnel,Shaoling plateau tunnel and Bailu plateau tunnel of the south main line in phaseⅡof Hanjiang-to-Weihe river water diversion project are located in the complex stratum with high groundwater.The seepage field of surrounding rock will be redistributed after tunnel excavation.Therefore,the accurate inversion of the surrounding rock permeability coefficient and calculation of the external water load of the lining are the basis for the design and analysis of the tunnel lining structure.To this end,ABAQUS is used to invert and analyze the distribution law of the seepage field of the surrounding rock after the typical tunnel excavation of the south main line in phaseⅡof Hanjiang-to-Weihe river water diversion project.The results are as follows.The redistribution of pore water pressure within 5 m around the tunnel after tunnel excavation is obvious.The seepage volume after excavation is the closest to the surge volume provided in the ground investigation report when the permeability coefficients of the surrounding rocks of Shenhe plateau tunnel,Shaoling plateau tunnel and Bailu plateau tunnel are 3.0×10^(-7)m/s,4.0×10^(-7)m/s and 4.0×10^(-8)m/s respectively.The external water loads act-ing on the lining of Shenhe plateau tunnel,Shaoling plateau tunnel and Bailu plateau tunnel are 0.071 MPa,0.081 MPa and 0.252 MPa respectively.The research results of this paper can provide a theoretical basis for the design of the lining structure of phaseⅡof Hanjiang-to-Weihe river water diversion project and similar projects.

关 键 词：隧洞围岩 渗流场 孔隙水压力 渗透系数 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]