超浅埋暗挖隧道管幕冻结法积极冻结方案试验研究
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摘要
港珠澳大桥珠海连接线拱北隧道口岸暗挖段,作为富水地区超浅埋暗挖隧道,采用管幕冻结预支护体系。以实顶管内"圆形主力冻结管"和空顶管内"异形加强冻结管"的不同组合方式形成实顶管单独冻结模式、实顶管与空顶管协同冻结模式和实顶管为主与空顶管为辅的冻结模式三类管幕冻结法积极冻结方案,结合设计方案要求,通过测点温度–时间曲线和冻土帷幕厚度两种不同分析方法,对以上方案进行了分析和验证。结果表明实顶管单独冻结模式不能在60 d内形成2 m厚冻土帷幕,实顶管与空顶管协同冻结模式30 d内即可形成2 m厚冻土帷幕,实顶管为主与空顶管为辅的冻结模式下异形冻结管滞后12 d和39 d开启60 d内均可形成2 m厚冻土帷幕,且异形冻结管开启后1～3 d即可达到管间封水要求。
The excavated section of Gongbei Tunnel of Zhuhai Link of Hong Kong-Zhuhai-Macao Bridge is an ultra-shallow buried tunnel located in water-rich area,and a new pre-support system named freeze-sealing pipe roof(FSPR) is first adopted.Based on the diverse combinations of "circular master freezing-tube" within the solid jacking pipes and "profiled enhancing freezing-tube" within the empty jacking pipes,three kinds of active freezing modes are proposed,i.e.,solid jacking pipes,combination of solid jacking pipes and empty jacking pipes,and combination of solid jacking pipes as the principal and empty jacking pipes as the complement.The above three freezing modes are analyzed and verified by means of two different analysis methods of temperature-time curve and thickness of frozen curtain according to the requirements of the design program.The results show that the first freezing mode cannot form a 2 m-thick frozen soil curtain in 60 d,the second one can form 2 m-thick frozen soil curtain within 30 d,and the third one can also form 2 m-thick frozen soil curtain in 60 d under lagged running of profiled enhancing freezing-tube of 12 d or 39 d;and the requirements of sealing water between jacked pipes can be achieved after 1 to 3 d when the profiled enhancing freezing-tube is started to work.
The excavated section of Gongbei Tunnel of Zhuhai Link of Hong Kong-Zhuhai-Macao Bridge is an ultra-shallow buried tunnel located in water-rich area,and a new pre-support system named freeze-sealing pipe roof(FSPR) is first adopted.Based on the diverse combinations of "circular master freezing-tube" within the solid jacking pipes and "profiled enhancing freezing-tube" within the empty jacking pipes,three kinds of active freezing modes are proposed,i.e.,solid jacking pipes,combination of solid jacking pipes and empty jacking pipes,and combination of solid jacking pipes as the principal and empty jacking pipes as the complement.The above three freezing modes are analyzed and verified by means of two different analysis methods of temperature-time curve and thickness of frozen curtain according to the requirements of the design program.The results show that the first freezing mode cannot form a 2 m-thick frozen soil curtain in 60 d,the second one can form 2 m-thick frozen soil curtain within 30 d,and the third one can also form 2 m-thick frozen soil curtain in 60 d under lagged running of profiled enhancing freezing-tube of 12 d or 39 d;and the requirements of sealing water between jacked pipes can be achieved after 1 to 3 d when the profiled enhancing freezing-tube is started to work.
引文
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[14]HU X D,SHE S Y.Study of freezing scheme in freeze-sealing pipe roof method based on numerical simulation of temperature field[C]//CPTT 2012.Wuhan,2012:1798-1805.
[15]胡向东,方涛.管幕冻结法在隧道开挖及初期支护过程中温度场数值模拟分析[J].中国公路,2013(增刊):72-79.(HU Xiang-dong,FANG Tao.Numerical simulation of temperature field at the excavation and primary support period in tunnel construction using freeze-sealing pipe roof method[J].China Highway,2013(S0):72-79.(in Chinese))
[16]HU X D,FANG T.Numerical simulation of temperature field at the active freeze period in tunnel construction using freeze-sealing pipe roof method[C]//Tunneling and Underground Construction.Shanghai,2014:731-741.
[17]汪洋.管幕冻结法钢管-冻土复合结构力学性能研究[D].上海:同济大学,2013.(WANG Yang.Mechanical property analysis of steel pipe-frozen soil composite structure in freeze-sealing pipe roof method[D].Shanghai:Tongji University,2013.(in Chinese))
[18]胡向东,任辉,陈锦,等.管幕冻结法积极冻结方案模型试验研究[J].现代隧道技术,2014,51(5):92-98.(HUXiang-dong,REN Hui,CHEN Jin,et al.Model test study of the active freezing scheme for the combined pipe-roof and freezing method[J].Modern Tunneling Technology,2014,51(5):92-98.(in Chinese))
[19]任辉,胡向东,陈锦,等.异形加强冻结管在管幕冻结法中的冻结效果及使用方法研究[J].隧道建设,2015,35(11):1169-1175.(REN Hui,HU Xiang-dong,CHEN Jin,et al.Study on freezing effect and operation of profiled enhancing freezing-tube in freeze-sealing pipe roof[J].Tunnel Construction,2015,35(11):1169-1175.(in Chinese))
[20]李志宏,王文州,胡向东,等.施工热扰动对管幕冻结止水帷幕影响研究[J].土木工程学报,2015,48(增刊2):374-379.(LI Zhi-hong,WANG Wen-zhou,HU Xiang-dong,et al.Research on influence of construction thermal disturbance on the freezing-sealing pipe roof[J].China Civil Engineering Journal,2015,48(S2):374-379.(in Chinese))
[21]胡向东,郭晓东,王啟铜,等.管幕冻结法现场试验研究[J].隧道建设,2015,35(增刊2):1-7.(HU Xiang-dong,GUO Xiao-dong,WANG Qi-tong,et al.Field test study on freezing technology of freeze-sealing pipe roof[J].Tunnel Construction,2015,35(S2):1-7.(in Chinese))
[22]张军,胡向东,任辉.拱北隧道管幕冻结施工中限位管的冻结效果控制研究[J].隧道建设,2015,35(11):1157-1163.(ZHANG Jun,HU Xiang-dong,REN Hui.Case study on control of freezing effect by installing limiting tubes in freezing-sealing pipe roof in Gongbei tunnel[J].Tunnel Construction,2015,35(11):1157-1163.(in Chinese))
[2]张云.浅埋暗挖大跨度地铁车站施工技术[J].隧道建设,2005,25(2):28-30,43.(ZHANG Yun.Construction technology of shallow buried and dark digging large-span metro station[J].Tunnel Construction,2005,25(2):28-30,43.(in Chinese))
[3]杨慧林.新管幕工法修建地铁暗挖车站技术研究[D].成都:西南交通大学,2013.(YANG Hui-lin.Research on new tubular roof method applied to underground excavated subway station[D].Chengdu:Southwest Jiaotong University,2013.(in Chinese))
[4]葛金科.饱和软土地层中管幕法隧道施工方案研究[J].上海公路,2004(1):38-43.(GE Jin-ke.Study on construction scheme of pipe-curtain tunneling in saturated soft soil stratum[J].Shanghai Highway,2004(1):38-43.(in Chinese))
[5]李耀良.张云海,李伟强.软土地区管幕法工艺研究与应用[J].地下空间与工程学报,2011,7(5):962-967.(LIYao-liang,ZHANG Yun-hai,LI Wei-qiang.Research and Application of Pipe Roofing Method in Soft Soil[J].Chinese Journal of Underground Space and Engineering,2011,7(5):962-967.(in Chinese))
[6]周晓敏,苏立凡,贺长俊,等.北京地铁隧道水平冻结法施工[J].岩土工程学报,1999,21(3):319-322.(ZHOUXiao-min,SU Li-fan,HE Chang-jun,et al.Horizontal ground freezing method applied to tunneling of Beijing underground railway system[J].Chinese Journal of Geotechnical Engineering,1999,21(3):319-322.(in Chinese))
[7]罗俊成,史海鸥,徐兵壮,等.长距离水平冻结法在广州地铁中的应用与实践[J].现代隧道技术,2002,39(4):22-26.(LUO Jun-cheng,SHI Hai-ou,XU Bing-zhuang,et al.Application of Horizontal Ground Freezing Method to Guangzhou Metro[J].Modern Tunnelling Technology,2002,39(4):22-26.(in Chinese))
[8]肖朝昀.人工地层冻结冻土帷幕形成与解冻规律研究[D].上海:同济大学,2007.(XIAO Zhao-yun.Research on the forming and thawing of frozen soil walls by artificial ground freezing method[D].Shanghai:Tongji University,2007.(in Chinese))
[9]张军.地层液氮冻结法特性及冻结效果研究[D].上海:同济大学,2011.(ZHANG Jun.Research on freezing characteristics and freezing effect by liquid nitrogen[D].Shanghai:Tongji University,2011.(in Chinese))
[10]HU X D,GUO W,ZHANG L Y,et al.Application of liquid nitrogen freezing to recovery of a collapsed shield tunnel[J].Journal of Performance of Constructed Facilities,2014,28(4):04014002.
[11]陈湘生.地层冻结法[M].北京:人民交通出版社,2013.(CHEN Xiang-sheng.Ground freezing method[M].Beijing:China Communications Press,2013.(in Chinese))
[12]余晶,程勇,贾瑞华.港珠澳大桥珠海连接线拱北隧道方案论证[J].现代隧道技术,2012,49(1):119-125+131.(YU Jing,CHENG Yong,JIA Rui-hua.Option Demonstration for the Gongbei Tunnel at the Zhuhai Link of the Hong Kong-Zhuhai-Macau Bridge[J].Modern Tunnelling Technology,2012,49(1):119-125+131.(in Chinese))
[13]程勇,刘继国.拱北隧道设计方案[J].公路隧道,2012(3):34-38.(CHENG Yong,LIU Ji-guo.Scheme designing of gongbei tunnel[J].Highway Tunnel,2012(3):34-38.(in Chinese))
[14]HU X D,SHE S Y.Study of freezing scheme in freeze-sealing pipe roof method based on numerical simulation of temperature field[C]//CPTT 2012.Wuhan,2012:1798-1805.
[15]胡向东,方涛.管幕冻结法在隧道开挖及初期支护过程中温度场数值模拟分析[J].中国公路,2013(增刊):72-79.(HU Xiang-dong,FANG Tao.Numerical simulation of temperature field at the excavation and primary support period in tunnel construction using freeze-sealing pipe roof method[J].China Highway,2013(S0):72-79.(in Chinese))
[16]HU X D,FANG T.Numerical simulation of temperature field at the active freeze period in tunnel construction using freeze-sealing pipe roof method[C]//Tunneling and Underground Construction.Shanghai,2014:731-741.
[17]汪洋.管幕冻结法钢管-冻土复合结构力学性能研究[D].上海:同济大学,2013.(WANG Yang.Mechanical property analysis of steel pipe-frozen soil composite structure in freeze-sealing pipe roof method[D].Shanghai:Tongji University,2013.(in Chinese))
[18]胡向东,任辉,陈锦,等.管幕冻结法积极冻结方案模型试验研究[J].现代隧道技术,2014,51(5):92-98.(HUXiang-dong,REN Hui,CHEN Jin,et al.Model test study of the active freezing scheme for the combined pipe-roof and freezing method[J].Modern Tunneling Technology,2014,51(5):92-98.(in Chinese))
[19]任辉,胡向东,陈锦,等.异形加强冻结管在管幕冻结法中的冻结效果及使用方法研究[J].隧道建设,2015,35(11):1169-1175.(REN Hui,HU Xiang-dong,CHEN Jin,et al.Study on freezing effect and operation of profiled enhancing freezing-tube in freeze-sealing pipe roof[J].Tunnel Construction,2015,35(11):1169-1175.(in Chinese))
[20]李志宏,王文州,胡向东,等.施工热扰动对管幕冻结止水帷幕影响研究[J].土木工程学报,2015,48(增刊2):374-379.(LI Zhi-hong,WANG Wen-zhou,HU Xiang-dong,et al.Research on influence of construction thermal disturbance on the freezing-sealing pipe roof[J].China Civil Engineering Journal,2015,48(S2):374-379.(in Chinese))
[21]胡向东,郭晓东,王啟铜,等.管幕冻结法现场试验研究[J].隧道建设,2015,35(增刊2):1-7.(HU Xiang-dong,GUO Xiao-dong,WANG Qi-tong,et al.Field test study on freezing technology of freeze-sealing pipe roof[J].Tunnel Construction,2015,35(S2):1-7.(in Chinese))
[22]张军,胡向东,任辉.拱北隧道管幕冻结施工中限位管的冻结效果控制研究[J].隧道建设,2015,35(11):1157-1163.(ZHANG Jun,HU Xiang-dong,REN Hui.Case study on control of freezing effect by installing limiting tubes in freezing-sealing pipe roof in Gongbei tunnel[J].Tunnel Construction,2015,35(11):1157-1163.(in Chinese))