某高地应力软岩隧道施工方案及多层支护结构变形分析
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摘要
针对某高地应力软岩单线铁路隧道岭脊核心段大变形控制难题,文章基于"先放后抗"和"先抗后放"的变形控制理念提出了两种不同的施工方案。通过现场试验与监测,分析与总结了不同开挖与支护工序对曲墙四层支护(三层初期支护+钢筋混凝土衬砌)结构变形的影响,得到了不同开挖与支护方案下各层初期支护变形规律。结果表明,从该隧道岭脊核心段施工安全性、施工时效性以及充分利用变形控制的时空效应方面考虑,建议采用基于"先抗后放,以抗为主"的变形控制理念。
Aiming at the challenge of large deformation control at the crucial mountain ridge section of a soft rock single-track railway tunnel under high geostress,two kinds of construction schemes of‘resisting after releasing"and"releasing after resisting"were proposed.By means of site test and monitoring,the effect of various excavation and support procedures on deformation of four-layer support structure(three layers of primary support + one layer of steel concrete lining) with curved wall was analyzed and summarized,the deformation law of each support layer was obtained.The results show that the deformation control concept of"resisting goes before releasing and resisting is preferred "is recommended considering construction safety and time efficiency of this crucial mountain ridge section and taking full advantage of time-space effect of deformation control.
Aiming at the challenge of large deformation control at the crucial mountain ridge section of a soft rock single-track railway tunnel under high geostress,two kinds of construction schemes of‘resisting after releasing"and"releasing after resisting"were proposed.By means of site test and monitoring,the effect of various excavation and support procedures on deformation of four-layer support structure(three layers of primary support + one layer of steel concrete lining) with curved wall was analyzed and summarized,the deformation law of each support layer was obtained.The results show that the deformation control concept of"resisting goes before releasing and resisting is preferred "is recommended considering construction safety and time efficiency of this crucial mountain ridge section and taking full advantage of time-space effect of deformation control.
引文
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[2]代伟,徐双永,杨喆坤.木寨岭隧道大坪斜井软岩大变形原因分析及施工技术[J].隧道建设,2010,30(2):169-172.DAI Wei,XU Shuangyong,YANG Zhekun.Technology for Control of Large Deformation of Daping Inclined Shaft of Muzhailing Tunnel in Soft Ground[J].Tunnel Construction,2010,30(2):169-172.
[3]廖俊.毛羽山隧道软岩大变形特征及原因分析[J].铁道建筑,2013(8):79-81.LIAO Jun.Characteristics of Large Deformation of Soft Rock and Causes Analysis on the Maoyushan Tunnel[J].Railway Engineering,2013(8):79-81.
[4]郑朋强,陈卫忠,谭贤君,等.软岩大变形巷道底臌破坏机制与支护技术研究[J].岩石力学与工程学报,2015,34(增1):3143-3149.ZHENG Pengqiang,CHEN Weizhong,TAN Xianjun,et al.Study of Failure Mechanism of Floor Heave and Supporting Technology in Soft Rock of Large Deformation Roadway[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(S1):3143-3149.
[5]李沿宗,高攀,邹翀,等.木寨岭隧道变形分析及初期支护参数优化研究[J].隧道建设,2011,31(3):320-324.LI Yanzong,GAO Pan,ZOU Chong,et al.Deformation Analysis and Primary Support Parameter Optimization:Case Study on Muzhailing Tunnel[J].Tunnel Construction,2011,31(3):320-324.
[6]刘国庆.木寨岭隧道软岩大变形段支护措施研究[J].现代隧道技术,2011,48(4):135-141.LIU Guoqing.Study of Support Measures for Large Deformed Section of Muzhailing Tunnel in Soft Rocks[J].Modern Tunnelling Technology,2011,48(4):135-141.
[7]贾宏俊,王辉.软岩大变形巷道刚柔结合支护方法研究[J].中国安全生产科学技术,2015,11(10):11-16.JIA Hongjun,WANG Hui.Research on Rigid-flexible Combined Support Method of Soft Rock Roadway with Large Deformation[J].Journal of Safety Science and Technology,2015,11(10):11-16.
[8]张文新,孙韶峰,刘虹.木寨岭隧道高地应力软岩大变形施工技术[J].现代隧道技术,2011,48(2):78-82.ZHANG Wenxin,SUN Shaofeng,LIU Hong.Construction Techniques of Muzhailing Tunnel with High Ground Stresses and Large Soft Rock Deformations[J].Modern Tunnelling Technology,2011,48(2):78-82.
[9]赵福善.兰渝铁路两水隧道高地应力软岩大变形控制技术[J].隧道建设,2014,34(6):546-552.ZHAO Fushan.Technologies to Control Serious Deformation of Soft Rocks with High Ground Stress:Case Study on Liangshui Tunnel on Lanzhou-Chongqing Railway[J].Tunnel Construction,2014,34(6):546-552.
[10]王立英,王庆林,崔小鹏.软岩大变形隧道施工技术探讨[J].兰州交通大学学报,2014,33(1):93-98.WANG Liying,WANG Qinglin,CUI Xiaopeng.Discussion on Construction Technology of Large Deformation Tunnel in Soft Ground[J].Journal of Lanzhou Jiaotong University,2014,33(1):93-98.
[11]卫鹏华.高地应力软岩大变形小净距隧道支护形式及施工顺序探讨[J].现代隧道技术,2018,55(3):167-175.WEI Penghua.Support Form and Construction Sequence for Soft Rock Tunnels with Small Spacing,High Stress and Deformation[J].Modern Tunnelling Technology,2018,55(3):167-175.