穿越公路偏压小净距隧道施工方法探讨
|
摘要
西康高速公路长哨小净距隧道地形复杂特殊,尤其在出口段存在浅埋、偏压现象,且左隧道覆盖层上部为陕西省S102省道,隧道开挖期间,省道正常开通。为研究隧道开挖方式对省道路面沉降及洞室开挖后围岩稳定性的影响,通过建立符合实际地形的三维模型,分别针对上下台阶法、留核心土法、侧壁导坑法3种开挖方法进行了数值模拟,对不同开挖方式隧道不同位置的塑性区、围岩变形及地表沉降进行了分析,提出了符合实际的开挖施工方案,并同实际现场监测数据进行了比较。研究结果表明,采用上下台阶开挖法实现省道下的小净距隧道穿越方式,可保证施工期间省道的正常运行及隧道围岩的稳定性。
Changshao Expressway tunnels with small spacing have complicated and special topographies;especially at the region of outlet,the provincial expressway S102 is only 5 meters over the vault of the left tunnel;and the right tunnel is pressed by an unsymmetrically pressure.In order to study the effects of excavation types on surface settlement and stability of surrounding rockmass,a three-dimensional model which is corresponding to realistic landform is built to simulate distribution of plastic zones,deformation of surrounding rockmass and surface settlement by three different excavation types which are bench cut method,core rock cut method and single-side drift method.Two practical excavation methods are recommended after simulating.Comparison of surface settlement is made between simulating result and field observations.The results show that bench cut method can be used to traverse provincial expressway.The surface settlement during excavation is small and surrounding rockmass is stable.
Changshao Expressway tunnels with small spacing have complicated and special topographies;especially at the region of outlet,the provincial expressway S102 is only 5 meters over the vault of the left tunnel;and the right tunnel is pressed by an unsymmetrically pressure.In order to study the effects of excavation types on surface settlement and stability of surrounding rockmass,a three-dimensional model which is corresponding to realistic landform is built to simulate distribution of plastic zones,deformation of surrounding rockmass and surface settlement by three different excavation types which are bench cut method,core rock cut method and single-side drift method.Two practical excavation methods are recommended after simulating.Comparison of surface settlement is made between simulating result and field observations.The results show that bench cut method can be used to traverse provincial expressway.The surface settlement during excavation is small and surrounding rockmass is stable.
引文
[1]李云鹏,王芝银,韩常领,等.不同围岩类别小间距隧道施工过程模拟研究[J].岩土力学,2006,27(1):11-16.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling,et al.Simulating study of construction process of tunnels withsmall spacing for different classes of surrounding rocks[J].Rock and Soil Mechanics,2006,27(1):11-16.
[2]李云鹏,王芝银,韩常领,等.考虑地震影响的小间距隧道围岩流变损伤[J].长安大学学报(自然科学版),2006,26(2):51-56.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling,et al.Rheologic damage and earthquake influence onsurrounding rock of small spacing tunnels[J].Journal ofChang’an University(Natural Science Edition),2006,26(2):51-56.
[3]龚建伍,夏才初,朱合华,等.鹤上大断面小净距隧道施工方案优化分析[J].岩土力学,2009,30(1):236-240.GONG Jian-wu,XIA Cai-chu,ZHU He-hua,et al.Optimal analysis of construction schemes for Heshangsmall-space tunnels with large section[J].Rock and SoilMechanics,2009,30(1):236-240.
[4]王怡,王芝银,李云鹏.偏压作用下小间距隧道的施工方法研究[J].现代隧道技术,2008,45(3):29-35.WANG Yi,WANG Zhi-yin,LI Yun-peng.Study of theconstruction of uneven-pressured twin tunnels with smallspacing[J].Modern Tunnelling Technology,2008,45(3):29-35.
[5]王芝银,李云鹏.地下工程位移反分析法及程序[M].西安:陕西科学技术出版社,1993.
[6]中华人民共和国水利部.GB 50218-94工程岩体分级标准[S].北京:中国计划出版社,1995.
[7]杨小礼,眭志荣.浅埋小净距偏压隧道施工工序的数值分析[J].中南大学学报(自然科学版),2007,38(4):764-770.YANG Xiao-li,SUI Zhi-rong.Numerical simulation ofconstruction sequence for shallow embedded bias tunnelswith small clear distance[J].Journal of Central SouthUniversity(Science and Technology),2007,38(4):764-770.
[8]靳晓光,刘伟,郑学贵,等.小净距偏压公路隧道开挖顺序优化[J].公路交通科技,2005,22(8):61-64.JIN Xiao-guang,LIU Wei,ZHENG Xue-gui,et al.Optimization of excavating sequence for closely spacedbias double-tube tunnels[J].Journal of Highway andTransportation Research and Development,2005,22(8):61-64.
[9]李云鹏,艾传志,韩常领,等..小间距隧道爆破开挖施工动力效应数值模拟研究[J].爆炸与冲击,2007,27(1):75-81.LI Yun-peng,AI Chuan-zhi,HAN Chang-ling,et al.Study of dynamics effect caused by blasting constructionby numerical simulation for tunnels with small spacing[J].Explosion and Shock Waves,2007,27(1):75-81.
[2]李云鹏,王芝银,韩常领,等.考虑地震影响的小间距隧道围岩流变损伤[J].长安大学学报(自然科学版),2006,26(2):51-56.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling,et al.Rheologic damage and earthquake influence onsurrounding rock of small spacing tunnels[J].Journal ofChang’an University(Natural Science Edition),2006,26(2):51-56.
[3]龚建伍,夏才初,朱合华,等.鹤上大断面小净距隧道施工方案优化分析[J].岩土力学,2009,30(1):236-240.GONG Jian-wu,XIA Cai-chu,ZHU He-hua,et al.Optimal analysis of construction schemes for Heshangsmall-space tunnels with large section[J].Rock and SoilMechanics,2009,30(1):236-240.
[4]王怡,王芝银,李云鹏.偏压作用下小间距隧道的施工方法研究[J].现代隧道技术,2008,45(3):29-35.WANG Yi,WANG Zhi-yin,LI Yun-peng.Study of theconstruction of uneven-pressured twin tunnels with smallspacing[J].Modern Tunnelling Technology,2008,45(3):29-35.
[5]王芝银,李云鹏.地下工程位移反分析法及程序[M].西安:陕西科学技术出版社,1993.
[6]中华人民共和国水利部.GB 50218-94工程岩体分级标准[S].北京:中国计划出版社,1995.
[7]杨小礼,眭志荣.浅埋小净距偏压隧道施工工序的数值分析[J].中南大学学报(自然科学版),2007,38(4):764-770.YANG Xiao-li,SUI Zhi-rong.Numerical simulation ofconstruction sequence for shallow embedded bias tunnelswith small clear distance[J].Journal of Central SouthUniversity(Science and Technology),2007,38(4):764-770.
[8]靳晓光,刘伟,郑学贵,等.小净距偏压公路隧道开挖顺序优化[J].公路交通科技,2005,22(8):61-64.JIN Xiao-guang,LIU Wei,ZHENG Xue-gui,et al.Optimization of excavating sequence for closely spacedbias double-tube tunnels[J].Journal of Highway andTransportation Research and Development,2005,22(8):61-64.
[9]李云鹏,艾传志,韩常领,等..小间距隧道爆破开挖施工动力效应数值模拟研究[J].爆炸与冲击,2007,27(1):75-81.LI Yun-peng,AI Chuan-zhi,HAN Chang-ling,et al.Study of dynamics effect caused by blasting constructionby numerical simulation for tunnels with small spacing[J].Explosion and Shock Waves,2007,27(1):75-81.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心