偏压隧道洞口段坡体钢花管注浆加固效果分析
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摘要
为了解决偏压隧道施作套拱初期致局部坡体滑移的问题,提出3种边坡加固方案进行对比分析,采用有限元强度折减法,建立相应的计算模型,分析3种加固方案下边坡安全系数、侧坡总位移、有效塑性应变、最大剪应变及隧道开挖的地表竖向位移值。通过对3种加固方案的对比及坡体测点的位移监测数据分析表明:对边坡施作工况3(对坡面挂网喷浆支护、坡体施作锚杆支护和局部钢花管注浆)的支护方式加固后坡体的稳定性明显优于工况1与工况2这2种坡体加固方案,工况3加固方案不仅提高了边坡的整体稳定性,而且能最大程度减小隧道开挖对地表变形的影响,在工程应用中取得了较好的经济效益与社会效益。
The local slope sliding would occur to portal section of unsymmetrically-pressured tunnel when carrying out cover arch construction. Hence,3 slope reinforcement schemes are proposed and comparatively analyzed. The slope safety factor,total slope displacement,effective plastic strain,maximum shear strain and vertical ground displacement are analyzed by calculation modeling based on finite element strength reduction method. The comparison results and displacement monitoring results show that:( 1) The slope reinforcement scheme of anchor bolt support + local steel pipe grouting + net spraying support is superior to other two schemes.( 2) The scheme adopted can improve the stability of the slope,maximally reduce the influence of tunnel excavation on ground deformation,and achieve good social and economic benefits.
The local slope sliding would occur to portal section of unsymmetrically-pressured tunnel when carrying out cover arch construction. Hence,3 slope reinforcement schemes are proposed and comparatively analyzed. The slope safety factor,total slope displacement,effective plastic strain,maximum shear strain and vertical ground displacement are analyzed by calculation modeling based on finite element strength reduction method. The comparison results and displacement monitoring results show that:( 1) The slope reinforcement scheme of anchor bolt support + local steel pipe grouting + net spraying support is superior to other two schemes.( 2) The scheme adopted can improve the stability of the slope,maximally reduce the influence of tunnel excavation on ground deformation,and achieve good social and economic benefits.
引文
[1]公路隧道设计规范:JTGD 70—2004[S].北京:人民交通出版社,2004.Highway tunnel design specification:JTGD 70-2004[S].Beijing:China Communications Press,2004.
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[4]陈思阳,朱彦鹏,李忠,等.大断面黄土偏压隧道开挖侧向边坡稳定性影响分析[J].现代隧道技术,2014,51(1):82.CHEN Siyang,ZHU Yanpeng,LI Zhong,et al. Analysis of lateral slope stability during construction of a loess tunnel with a large section[J]. Modern Tunnelling Technology,2014,51(1):82.
[5]王华俊,徐洪科,董理金.钢花管注浆加固在高速公路边坡挡墙病害防治中的应用研究[J].地质灾害与环境保护,2016,27(3):92.WANG Huajun,XU Hongke,DONG Lijin. Application of grouted steel floral tube in preventing discases of slope retaining wall in highway[J]. Journal of Geological Hazards and Environment Preservation,2016,27(3):92.
[6]王俊生.边坡整治的注浆钢花管桩加固设计方法[J].山西建筑,2016,42(21):77.WANG Junsheng. The reinforcement design method of grouting steel pipe of slope remediation[J]. Shanxi Architecture,2016,42(21):77.
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[8]杨小永,伍法权,苏生瑞.穿越古滑坡的浅埋偏压连拱隧道动态施工响应规律[J].工程地质学报,2006,14(3):314.YANG Xiaoyong, WU Faquan, SU Shengrui. Dynamic constructional responde of a shallow-buried and unsymmetrical-loaded double-arch tunnel across an ancientlandslide[J]. Journal of Engineering Geology,2006,14(3):314.
[9]毕小勇,闫天俊,鲁杰. Midas-GTS(SRM)在边坡二维稳定性分析中的运用[J].自然灾害学报,2015,24(1):170.BI Xiaoyong,YAN Tianjun,LU Jie. Application of MidasGTS(SRM)to 2D stability analysis of slope[J]. Journal of Natural Disasters,2015,24(1):170.
[10]连镇营,韩国城,孔宪京,等.强度折减有限元法研究开挖边坡的稳定性[J].岩土工程学报,2001,23(4):407.LIAN Zhenying,HAN Guocheng,KONG Xianjing,et al.Stability analysis of excavation by strength reduction FEM[J]. Chinese Journal of Geotechnical Engineering,2001,23(4):407.
[11]李志佳,张顶立,房倩,等.基于强度折减法的土质边坡稳定性影响因素分析[J].隧道建设,2013,33(10):854.LI Zhijia,ZHANG Dingli,FANG Qian,et al. An analysis of factors influencing stability of soil slope by strength reduction method[J]. Tunnel Construction, 2013, 33(10):854.
[12]刘金龙,栾茂田,赵少飞,等.关于强度折减有限元方法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345.LIU Jinlong, LUAN Maotian, ZHAO Shaofei, et al.Discussion on criteria for evaluating stability of slope in elastoplastic FEM based on shear strength reduction technique[J]. Rock and Soil Mechanics,2005,26(8):1345.
[13]慕欣,陈喜坤,陈洪祥.砂细度模数对壁后注浆浆液强度的影响[J].长江科学院院报,2017,34(4):136.MU Xin,CHEN Xikun,CHEN Hongxiang. Influence of sand's fineness modulus on slurry strength of backfill grouting[J]. Journal of Yangtze River Scientific Research Institute,2017,34(4):136.
[14]孙志杰,申俊敏.隧道洞口段不同围岩刚度下管棚的支护效果分析[J].华北水利水电学院学报,2013,34(6):25.SUN Zhijie, SHEN Junmin. Analysis on pipe roof reinforcement effects under different stiffness of surrounding rock in portal section of tunnel[J]. Journal of North China Institute of Water Conservancy and Hydroelectric Power,2013,34(6):25.
[2]郑明新,方焘,曾云华.赣龙铁路边坡防护与施工控制问题的探讨[J].华东交通大学学报,2002(4):21.ZHENG Mingxin,FANG Tao,ZENG Yunhua. Research of slope protection and construction control along Ganlong Railway[J]. Journal of East China Jiaotong University,2002(4):21.
[3]沈金瑞,林杭,许世远,等.边坡岩体弱面注浆宏观效应数值模拟分析[J].中国地质灾害与防治学报,2007(3):82.SHEN Jinrui, LIN Hang, XU Shiyuan, et al. The macroscopical effect of grouting in weak planes of slope rockmass[J]. The Chinese Journal of Geological Hazard and Control,2007(3):82.
[4]陈思阳,朱彦鹏,李忠,等.大断面黄土偏压隧道开挖侧向边坡稳定性影响分析[J].现代隧道技术,2014,51(1):82.CHEN Siyang,ZHU Yanpeng,LI Zhong,et al. Analysis of lateral slope stability during construction of a loess tunnel with a large section[J]. Modern Tunnelling Technology,2014,51(1):82.
[5]王华俊,徐洪科,董理金.钢花管注浆加固在高速公路边坡挡墙病害防治中的应用研究[J].地质灾害与环境保护,2016,27(3):92.WANG Huajun,XU Hongke,DONG Lijin. Application of grouted steel floral tube in preventing discases of slope retaining wall in highway[J]. Journal of Geological Hazards and Environment Preservation,2016,27(3):92.
[6]王俊生.边坡整治的注浆钢花管桩加固设计方法[J].山西建筑,2016,42(21):77.WANG Junsheng. The reinforcement design method of grouting steel pipe of slope remediation[J]. Shanxi Architecture,2016,42(21):77.
[7]龙浪波.隧道洞口段边坡稳定性研究及数值分析[D].成都:西南交通大学,2009.LONG Langbo. Research on the slop stability and numberical analysis at the tunnel entrance[D]. Chengdu:Southwest Jiaotong University,2009.
[8]杨小永,伍法权,苏生瑞.穿越古滑坡的浅埋偏压连拱隧道动态施工响应规律[J].工程地质学报,2006,14(3):314.YANG Xiaoyong, WU Faquan, SU Shengrui. Dynamic constructional responde of a shallow-buried and unsymmetrical-loaded double-arch tunnel across an ancientlandslide[J]. Journal of Engineering Geology,2006,14(3):314.
[9]毕小勇,闫天俊,鲁杰. Midas-GTS(SRM)在边坡二维稳定性分析中的运用[J].自然灾害学报,2015,24(1):170.BI Xiaoyong,YAN Tianjun,LU Jie. Application of MidasGTS(SRM)to 2D stability analysis of slope[J]. Journal of Natural Disasters,2015,24(1):170.
[10]连镇营,韩国城,孔宪京,等.强度折减有限元法研究开挖边坡的稳定性[J].岩土工程学报,2001,23(4):407.LIAN Zhenying,HAN Guocheng,KONG Xianjing,et al.Stability analysis of excavation by strength reduction FEM[J]. Chinese Journal of Geotechnical Engineering,2001,23(4):407.
[11]李志佳,张顶立,房倩,等.基于强度折减法的土质边坡稳定性影响因素分析[J].隧道建设,2013,33(10):854.LI Zhijia,ZHANG Dingli,FANG Qian,et al. An analysis of factors influencing stability of soil slope by strength reduction method[J]. Tunnel Construction, 2013, 33(10):854.
[12]刘金龙,栾茂田,赵少飞,等.关于强度折减有限元方法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345.LIU Jinlong, LUAN Maotian, ZHAO Shaofei, et al.Discussion on criteria for evaluating stability of slope in elastoplastic FEM based on shear strength reduction technique[J]. Rock and Soil Mechanics,2005,26(8):1345.
[13]慕欣,陈喜坤,陈洪祥.砂细度模数对壁后注浆浆液强度的影响[J].长江科学院院报,2017,34(4):136.MU Xin,CHEN Xikun,CHEN Hongxiang. Influence of sand's fineness modulus on slurry strength of backfill grouting[J]. Journal of Yangtze River Scientific Research Institute,2017,34(4):136.
[14]孙志杰,申俊敏.隧道洞口段不同围岩刚度下管棚的支护效果分析[J].华北水利水电学院学报,2013,34(6):25.SUN Zhijie, SHEN Junmin. Analysis on pipe roof reinforcement effects under different stiffness of surrounding rock in portal section of tunnel[J]. Journal of North China Institute of Water Conservancy and Hydroelectric Power,2013,34(6):25.