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
以某偏压隧道施作套拱初期致局部坡体滑移为研究背景,提出3种边坡加固方案进行对比分析,采用有限元法,建立相应计算模型分析在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下地表竖向位移值。通过对3种加固方案对比分析表明:坡面挂网喷浆+注浆锚杆+局部坡体钢花管注浆加固后坡体的稳定性明显优于坡面挂网喷浆+注浆锚杆与坡面挂网喷浆+注浆锚杆+局部坡体注浆支护。结合现场实测验证了数值仿真中的第三种加固方案的可行性,结果表明该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,在工程中应用取得了良好的经济效应与社会效应。
Based on the background of slope slipping caused at initial arch stage of a biased tunnel,three kinds of slope reinforcement schemes are proposed for comparative analysis.The finite element method is used to establish the corresponding calculation models to analyze the slope under three kinds of reinforcement schemes in terms of safety factor,total slope displacement,effective plastic strain and maximum shear strain and vertical displacement of the ground surface under tunnel excavation.After comparisons and analysis on the three kinds of reinforcement schemes it shows that show that the stability of the slope suspended mesh gunite+grouting anchor+local steel pipe grouting reinforcement is obviously better than the suspended mesh gunite+grouting anchor and suspended mesh gunite+grouting anchor+local slope grouting support.The feasibility of the third reinforcement scheme in numerical simulation is verified by the field measurement.The results show that the program can not only improve the overall stability of the slope but also minimize the impact of tunnel excavation on the surface deformation and obtain good economic and social benefits.
Based on the background of slope slipping caused at initial arch stage of a biased tunnel,three kinds of slope reinforcement schemes are proposed for comparative analysis.The finite element method is used to establish the corresponding calculation models to analyze the slope under three kinds of reinforcement schemes in terms of safety factor,total slope displacement,effective plastic strain and maximum shear strain and vertical displacement of the ground surface under tunnel excavation.After comparisons and analysis on the three kinds of reinforcement schemes it shows that show that the stability of the slope suspended mesh gunite+grouting anchor+local steel pipe grouting reinforcement is obviously better than the suspended mesh gunite+grouting anchor and suspended mesh gunite+grouting anchor+local slope grouting support.The feasibility of the third reinforcement scheme in numerical simulation is verified by the field measurement.The results show that the program can not only improve the overall stability of the slope but also minimize the impact of tunnel excavation on the surface deformation and obtain good economic and social benefits.
引文
[1] JTG D70—2004公路隧道设计规范[S].
[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):21-24.
[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):82-87.
[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):82-89.
[5]张涛,刘洪亮,张延欢.隧道明洞段边坡稳定性分析及治理[J].公路,2017,62(9):86-90.
[6]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):92-95.
[7]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):77-78.
[8]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.
[9]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):314-319.
[10]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):170-176.
[11]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):407-411.
[12]贾致荣.包边填砂路基边坡稳定性分析[J].铁道建筑,2008,(5):70-73.
[13]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,24(3):343-346.
[14]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):1345-1348.
[15]张江昊.基于MIDAS—GTS的渗流—应力耦合作用下边坡稳定性分析[J].甘肃科技,2016,32(8):112-113.
[16]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):92-95.
[17]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):25-28.
[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):21-24.
[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):82-87.
[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):82-89.
[5]张涛,刘洪亮,张延欢.隧道明洞段边坡稳定性分析及治理[J].公路,2017,62(9):86-90.
[6]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):92-95.
[7]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):77-78.
[8]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.
[9]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):314-319.
[10]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):170-176.
[11]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):407-411.
[12]贾致荣.包边填砂路基边坡稳定性分析[J].铁道建筑,2008,(5):70-73.
[13]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,24(3):343-346.
[14]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):1345-1348.
[15]张江昊.基于MIDAS—GTS的渗流—应力耦合作用下边坡稳定性分析[J].甘肃科技,2016,32(8):112-113.
[16]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):92-95.
[17]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):25-28.