新建隧道下穿既有运营地铁施工的力学机理
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摘要
依托某新建地铁隧道下穿既有运营地铁线,基于三维数值计算分析方法,与现场监测数据进行对比,验证了模拟的可靠性,研究了全断面法、上下台阶法和盾构法等3种地铁隧道施工方案对既有运营地铁结构的影响,进而提出了有效的变形控制措施.研究结果表明:相对于全断面法和上下台阶法,盾构法施工能够有效地降低地表和既有隧道结构的沉降,以及既有隧道管片的主应力,且沉降收敛所用时间短于全断面法和上下台阶法;通过采取有效的注浆加固措施,可以大幅度减小地表沉降、既有隧道的不均匀沉降和天然岩层的沉降;施工中,应结合实际情况,合理选取注浆加固区域,避免材料的浪费.
For the new metro tunnel passing under the existing metro tunnel,based on the threedimensional numerical analysis method,the field monitoring data was compared to verify the simulation reliability. The effects of three tunnel construction schemes of entire section method,benching tunneling construction method and shield method on existing metro structures were investigated,and the effective deformation control measures were proposed. The results show that compared with the entire section method and the benching tunneling construction method,the shield method can effectively reduce the earth surface and existing metro tunnel settlements and the principal stress of existing tunnel structure,and the convergence time of settlement is shorter than those of other two schemes. Through effective grouting reinforcement measures,the surface subsidence,the uneven settlement of existing metro tunnel and the settlement of natural rock formations can be drastically reduced. In the process of construction,the reasonable selection of grouting reinforcement area should be combined with the actual situation to avoid material waste.
For the new metro tunnel passing under the existing metro tunnel,based on the threedimensional numerical analysis method,the field monitoring data was compared to verify the simulation reliability. The effects of three tunnel construction schemes of entire section method,benching tunneling construction method and shield method on existing metro structures were investigated,and the effective deformation control measures were proposed. The results show that compared with the entire section method and the benching tunneling construction method,the shield method can effectively reduce the earth surface and existing metro tunnel settlements and the principal stress of existing tunnel structure,and the convergence time of settlement is shorter than those of other two schemes. Through effective grouting reinforcement measures,the surface subsidence,the uneven settlement of existing metro tunnel and the settlement of natural rock formations can be drastically reduced. In the process of construction,the reasonable selection of grouting reinforcement area should be combined with the actual situation to avoid material waste.
引文
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[9]朱正国,余剑涛,朱永全,等.新建隧道超近距离下穿既有地铁施工方案优化[J].铁道工程学报,2013,30(9):111-115.ZHU Z G,YU J T,ZHU Y Q,et al.Study on optimization of construction schemes for new tunnel under-pass the existing subway station at short range[J].Journal of Railway Engineering Society,2013,30(9):111-115.(in Chinese)
[10]邹明波,张文新.新建赣韶铁路黄金隧道塌方段注浆加固技术探讨[J].现代隧道技术,2013,50(4):176-182.ZOU M B,ZHANG W X.Discussion of grouting reinforcement technology for the collapsed section of the Huangjin Tunnel on the newly-built Ganzhou-Shaoguan railway[J].Modern Tunnelling Technology,2013,50(4):176-182.(in Chinese)
[11]陈孟乔,杨广武.新建地铁车站近距离穿越既有地铁隧道的变形控制[J].中国铁道科学,2011,32(4):53-59.CHEN M Q,YANG G W.Deformation control of a newly-built subway station crossing the adjacent existing subway tunnel[J].China Railway Science,2011,32(4):53-59.(in Chinese)
[12]LEE W F,ISHIHARA K J.Piping failure of a metro tunnel construction[C]∥International Symposium on Backwards Problem in Geotechnical Engineering and Monitoring of Geo-Construction.India:Proceeding of TC302 Symposium Osaka,2011:73-82.
[2]邹新宽,张继春,潘强,等.连拱隧道近接重叠既有隧道时的施工性态数值模拟[J].江苏大学学报(自然科学版),2016,37(2):225-230.ZOU X K,ZHANG J C,PAN Q,et al.Numerical simulation and analysis of construction behavior for dualarch tunnel tunneling overlapped to existing tunnel[J].Journal of Jiangsu University(Natural Science Edition),2016,37(2):225-230.(in Chinese)
[3]武科,张文,吴昊天,等.上软下硬地层地铁隧道下穿既有城市道路的变形规律及控制措施研究[J].现代隧道技术,2017,54(6):126-135.WU K,ZHANG W,WU H T,et al.Deformation law of a metro tunnel underneath an existing urban road in combination soft/hard stratum[J].Modern Tunnelling Technology,2017,54(6):126-135.(in Chinese)
[4]杨立华,潘智锋,王晨涛.软弱围岩条件下新建隧道下穿浅埋隧道安全及稳定性研究[J].公路,2015(7):303-305.YANG L H,PAN Z F,WANG C T.Study on the safety and stability of newly built tunnels underlying shallowburied tunnels under weak surrounding rock conditions[J].Highway,2015(7):303-305.(in Chinese)
[5]应国柱,汪鹏程,朱大勇,等.基于模糊综合评价模型的地铁施工风险评估[J].地下空间与工程学报,2016,12(2):539-545.YING G Z,WANG P C,ZHU D Y,et al.Risk assessment of subway construction based on fuzzy comprehensive evaluation model[J].Chinese Journal of Underground Space and Engineering,2016,12(2):539-545.(in Chinese)
[6]VERRUIJT A,BOOKER J R.Surface settlements due to deformation of a tunnel in an elastic half plane[J].Géotechnique,1996,46(4):753-756.
[7]徐前卫,朱合华,马险峰,等.地铁盾构隧道穿越桥梁下方群桩基础的托换与除庄技术研究[J].岩土工程学报,2012,34(7):1217-1226.XU Q W,ZHU H H,MA X F,et al.Pile underpinning and removing technology of shield tunnels crossing through group pile foundations of road bridges[J].Chinese Journal of Geotechnical Engineering,2012,34(7):1217-1226.(in Chinese)
[8]薛煌.洞内桩梁式托换在广州地铁工程中的应用[J].隧道建设,2006,26(6):34-36.XUE H.Application of pile+beam underpinning in Guangzhou metro project[J].Tunnel Construction,2006,26(6):34-36.(in Chinese)
[9]朱正国,余剑涛,朱永全,等.新建隧道超近距离下穿既有地铁施工方案优化[J].铁道工程学报,2013,30(9):111-115.ZHU Z G,YU J T,ZHU Y Q,et al.Study on optimization of construction schemes for new tunnel under-pass the existing subway station at short range[J].Journal of Railway Engineering Society,2013,30(9):111-115.(in Chinese)
[10]邹明波,张文新.新建赣韶铁路黄金隧道塌方段注浆加固技术探讨[J].现代隧道技术,2013,50(4):176-182.ZOU M B,ZHANG W X.Discussion of grouting reinforcement technology for the collapsed section of the Huangjin Tunnel on the newly-built Ganzhou-Shaoguan railway[J].Modern Tunnelling Technology,2013,50(4):176-182.(in Chinese)
[11]陈孟乔,杨广武.新建地铁车站近距离穿越既有地铁隧道的变形控制[J].中国铁道科学,2011,32(4):53-59.CHEN M Q,YANG G W.Deformation control of a newly-built subway station crossing the adjacent existing subway tunnel[J].China Railway Science,2011,32(4):53-59.(in Chinese)
[12]LEE W F,ISHIHARA K J.Piping failure of a metro tunnel construction[C]∥International Symposium on Backwards Problem in Geotechnical Engineering and Monitoring of Geo-Construction.India:Proceeding of TC302 Symposium Osaka,2011:73-82.