郑万高铁大型机械化施工隧道位移控制基准研究
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摘要
依托郑万高铁湖北段大断面隧道洞群,针对其开挖断面面积大、软弱围岩占比高、采用大型机械化大断面法施工的特点,开展初期支护位移现场监控量测,对监控量测数据进行分类统计、包络回归分析,得到Ⅳ、Ⅴ级围岩深、浅埋不同大断面法(全断面法、微台阶法)开挖下初期支护位移沿隧道纵向的函数表达式及各工况下分段位移占极限位移的比值。最后结合Q/CR 9218—2015《铁路隧道监控量测技术规程》中初期支护极限位移值,给出郑万高铁大型机械化施工隧道各工况下初期支护位移控制基准建议值。结果表明:郑万高铁隧道Ⅳ、Ⅴ级围岩采用深、浅埋不同大断面法开挖时,按距掌子面距离的分阶段位移控制基准相差较大,现行Q/CR 9218—2015《铁路隧道监控量测技术规程》中统一规定不合理;围岩级别、埋深及开挖方法相同时,拱顶沉降和洞周水平收敛规律基本一致。
The large cross-sectional tunnel group on Hubei Section of Zhengzhou-Wanzhou High-speed Railway has the features of large excavation cross-section,high proportion of weak surrounding rocks and large scale mechanized construction. Firstly,field monitoring on the displacement of primary support is carried out. And then the monitoring data are classified,summarized and analyzed to obtain the functional expressions for primary support displacement along longitudinal direction and proportions of tunnel displacement along longitudinal direction of each section under different conditions of large cross-section methods( full-section method and micro-bench method),different buried depth( deep buried and shallow buried) and different grades of surrounding rocks( Grade Ⅳ and Ⅴ). Finally,the recommerded values of the primary support displacement control criterion for large scale mechanized construction of tunnels on Zhengzhou-Wanzhou High-speed Railway are proposed based on the ultimate displacement in Technical Specification for Monitoring Measurement of Railway Tunnel: Q/CR 9218-2015. The results show that:( 1) The displacement control criterions according to the distance from tunnel face in different phases of tunnel on Zhengzhou-Wanzhou High-speed Railway are variable under different conditions,thus the standard ultimate displacement in criterion is unreasonable.( 2) The laws of crown top settlement and tunnel surrounding horizontal convergence are consistent under different conditions of surrounding rock grades,buried depths and excavation methods.
The large cross-sectional tunnel group on Hubei Section of Zhengzhou-Wanzhou High-speed Railway has the features of large excavation cross-section,high proportion of weak surrounding rocks and large scale mechanized construction. Firstly,field monitoring on the displacement of primary support is carried out. And then the monitoring data are classified,summarized and analyzed to obtain the functional expressions for primary support displacement along longitudinal direction and proportions of tunnel displacement along longitudinal direction of each section under different conditions of large cross-section methods( full-section method and micro-bench method),different buried depth( deep buried and shallow buried) and different grades of surrounding rocks( Grade Ⅳ and Ⅴ). Finally,the recommerded values of the primary support displacement control criterion for large scale mechanized construction of tunnels on Zhengzhou-Wanzhou High-speed Railway are proposed based on the ultimate displacement in Technical Specification for Monitoring Measurement of Railway Tunnel: Q/CR 9218-2015. The results show that:( 1) The displacement control criterions according to the distance from tunnel face in different phases of tunnel on Zhengzhou-Wanzhou High-speed Railway are variable under different conditions,thus the standard ultimate displacement in criterion is unreasonable.( 2) The laws of crown top settlement and tunnel surrounding horizontal convergence are consistent under different conditions of surrounding rock grades,buried depths and excavation methods.
引文
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[14]郭军.大跨扁平公路隧道稳定性位移控制基准研究[J].公路交通技术,2015(6):73.GUO Jun.Research on displacement control baseline of large-span flat highway tunnels[J].Technology of Highway and Transport,2015(6):73.
[2]铁路隧道监控量测技术规程:Q/CR 9218-2015[S].北京:中国铁道出版社,2015.Technical specification for monitoring measurement of railway tunnel:Q/CR 9218-2015[S].Beijing:China Railway Publishing House,2015.
[3]铁路隧道设计规范:TB 10003-2016[S].北京:中国铁道出版社,2017.Code for design of railway tunnel:TB 10003-2016[S].Beijing:China Railway Publishing House,2017.
[4]公路隧道设计规范:JTG D70-2004[S].北京:人民交通出版社,2004.Code for design of road tunnel:JTG D70-2004[S].Beijing:China Communications Press,2004.
[5]朱永全.隧道稳定性位移判别准则[J].中国铁道科学,2001,22(6):80.ZHU Yongquan.The criterion predicting tunnel stability by displacement[J].China Railway Science,2001,22(6):80.
[6]朱永全,张素敏,景诗庭.铁路隧道初期支护极限位移的意义及确定[J].岩石力学与工程学报,2005,24(9):1594.ZHU Yongquan,ZHANG Sumin,JING Shiting.Concept and determination of limit displacements of primary support system of railway tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(9):1594.
[7]刘大刚,王明年.公路隧道位移判定基准研究[J].路基工程,2008(5):64.LIU Dagang,WANG Mingnian.Research on benchmark for determining displacement of highway tunnel[J].Subgrade Engineering,2008(5):64.
[8]王明年,路军富,刘大刚,等.大断面海底隧道CRD法绝对位移控制基准建立及应用研究[J].岩土力学,2010,31(10):3354.WANG Mingnian,LU Junfu,LIU Dagang,et al.Study of absolute deformation control criterion and its application for large section subsea tunnel with"CRD"method[J].Rock and Soil Mechanics,2010,31(10):3354.
[9]扈世民.大断面黄土隧道围岩变形特征及控制技术研究[D].北京:北京交通大学,2012.HU Shimin.Research on deformation characteristics and control measures of the large-section loess tunnel[D].Beijing:Beijing Jiaotong University,2012.
[10]李晓红,王宏图,贾剑青,等.隧道及地下工程围岩稳定性及可靠性分析的极限位移判别[J].岩土力学,2005,26(6):850.LI Xiaohong,WANG Hongtu,JIA Jianqing,et al.Ultimate displacement discrimination of stability and reliability analysis of surrounding rocks of tunnel and underground engineering[J].Rock and Soil Mechanics,2005,26(6):850.
[11]邢厚俊.对客运专线铁路隧道施工稳定性判据的思考[J].铁道建筑,2006(12):39.XING Houjun.Consideration on surrounding rock stability criteria in tunnel construction of passenger dedicated railway[J].Railway Engineering,2006(12):39.
[12]马士伟,韩学诠,廖凯.浅埋大断面黄土隧道防塌方实时监测预警[J].现代隧道技术,2014,51(2):11.MA Shiwei,HAN Xuequan,LIAO Kai.Real-time monitoring and early alarms for collapse prevention in a shallow loess tunnel with a large section[J].Modern Tunnelling Technology,2014,51(2):11.
[13]谢军,房营光,莫海鸿,等.特大断面隧道长期运营预警值的研究[J].地下空间与工程学报,2009,5(1):39.XIE Jun,FANG Yingguang,MO Haihong,et al.Study of long term warning value of super large section tunnel[J].Chinese Journal of Underground Space and Engineering,2009,5(1):39.
[14]郭军.大跨扁平公路隧道稳定性位移控制基准研究[J].公路交通技术,2015(6):73.GUO Jun.Research on displacement control baseline of large-span flat highway tunnels[J].Technology of Highway and Transport,2015(6):73.