朝阳站富水砂卵石层施工动态降水控制技术研究
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摘要
以长沙地铁5号线朝阳站为工程背景,对车站工程地质和水文条件,采用理论分析、数值模拟等方法对富水砂卵地层条件下基坑动态降水控制技术进行研究。通过确定降水方法,明确降水过程中地下水位动态水文变化过程排水量的计算公式;得到3个降水阶段基坑降水进入稳定的时间、地表沉降达到稳定需要的时间以及最后的沉降值。
The Chaoyang station in the 5 th line of Changsha subway is taken as engineering background.Considering the station engineering geological and hydrological conditions,the dynamic dewatering control technologies for the water-rich sandy gravel layer of foundation ditch were studied by using theory analysis,field test and numerical simulation methods.The drawdown method was determined,the formula for calculating the displacement of groundwater level considering drawdown process was definited,and the stability time of foundation ditch at three drawdown stages of foundation,the time to reach steady and the final settlement value for surface subsidence were obtained.
The Chaoyang station in the 5 th line of Changsha subway is taken as engineering background.Considering the station engineering geological and hydrological conditions,the dynamic dewatering control technologies for the water-rich sandy gravel layer of foundation ditch were studied by using theory analysis,field test and numerical simulation methods.The drawdown method was determined,the formula for calculating the displacement of groundwater level considering drawdown process was definited,and the stability time of foundation ditch at three drawdown stages of foundation,the time to reach steady and the final settlement value for surface subsidence were obtained.
引文
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[15]张治国,张孟喜.软土城区土压平衡盾构上下交叠穿越地铁隧道的变形预测及施工控制[J].岩石力学与工程学报,2013,32(增2):3428-3439.ZHANG Zhiguo,ZHANG Mengxi.Deformation prediction of subway tunnel induced by EPB shield in soft clay during above and down overlapped traversing process and its construction control[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Suppl 2):3428-3439.
[2]王霆,刘维宁,张成满,等.地铁车站浅埋暗挖法施工引起地表沉降规律研究[J].岩石力学与工程学报,2007,26(9):1855-1861.WANG Ting,LIU Weining,ZHANG Chengman,et al.Study on ground settlement induced by shallow metro station sonstruction[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(9):1855-1861.
[3]张顶立,黄俊.深圳地铁浅埋暗挖隧道地层变形分析[J].中国矿业大学学报,2004,33(5):88-93.ZHANG Dingli,HUANG Jun.Analysis of ground deformation for shallow tunnel in Shenzhen city[J].Journal of China University of Mining&Technology,2004,33(5):88-93.
[4]唐业清.基坑工程事故分析与处理[M].北京:中国建筑工业出版社,1999.TANG Yeqing.Analysis and treatment of accident in foundation ditch engineering[M].Beijing:China Construction Industry Press,1999.
[5]唐传政,彭晓秋,王越.武汉某市政通道基坑工程事故险情分析处理与经验教训[J].岩土工程学报,2012,34(增):735-738.TANG Chuanzheng,PENG Xiaoqiu,WANG Yue.Experience and lessons from analysis and treatment of accident risk of excavation of a municipal road in Wuhan[J].Chinese Journal of Geotechnical Engineering,2012,34(Suppl):735-738.
[6]刘宝琛.急待深入研究的地铁建设中的岩土力学课题[J].铁道建筑技术,2000(3):l-3.LIU Baochen.Problems on geomechanics in need of immediate deep research in subway construction[J].Railway Construction Technology,2000(3):l-3.
[7]CHEN Chongxi,PEI S,JIAO J.Land subsidence caused by groundwater exploitation in Suzhou city[J].Hydrogeology Journal,2003,11(2):275-287.
[8]陈崇希.地下水不稳定井流计算方法[M].北京:地质出版社,1983.CHEN Chongxi.Calculation method of unsteady well flow in groundwater[M].Beijing:China Geological Press,1983.
[9]李金轩.基坑井点降水工程的优化设计[J].勘察科学技术,1994(5):39-41.LI Jinxuan.Optimum design of foundation pit well point dewatering project[J].Site Investigation Science and Technology,1994(5):39-41.
[10]Helm D C.Horizontal aquifer movement in a Theis-Thiem confined system[J].Water Resources Research,1994,30(4):953-964.
[11]Finno R J,Atmatzidis D K,Perkins S B.Observed performance of a deep excavation in clay[J].Journal of Geotechnical Engineering,1989,115(8):1045-1064.
[12]Clough G W,Hansen L A.Clay anisotropy and braced wall behavior[J].Journal of Geotechnical&Geoenvironmental Engineering,1981,107(7):893-913.
[13]骆祖江,刘金宝,李朗,等.深基坑降水与地面沉降变形三维全耦合模型及其数值模拟[J].水动力学研究与进展(A辑),2006,21(4):479-485.LUO Zujiang,LIU Jingbao,LI Lang,et al.Numerical smiulation based on the three dimensional full coupling model between deep foundation pit dewatering and land-subsidence[J].Journal of Hydrodynamics(Ser.A),2006,21(4):479-485.
[14]Faheem H,CAI F,Ugai K,et al.Two-dimensional base stability of excavations in soft soils using FEM[J].Computers&Geotechnics,2003,30(2):141-163.
[15]张治国,张孟喜.软土城区土压平衡盾构上下交叠穿越地铁隧道的变形预测及施工控制[J].岩石力学与工程学报,2013,32(增2):3428-3439.ZHANG Zhiguo,ZHANG Mengxi.Deformation prediction of subway tunnel induced by EPB shield in soft clay during above and down overlapped traversing process and its construction control[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Suppl 2):3428-3439.