边坡分级柔性支护数值模拟研究
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摘要
为了探讨土钉与框架预应力锚杆分级支护边坡的锚固效果及其协同工作性能,采用快速拉格朗日差分软件FLAC3D,对兰州某边坡进行分级柔性支护数值模拟研究;考虑分级支护施工顺序,对比分析了边坡支护前后的塑性破坏发展趋势、安全系数变化规律、位移变化情况以及土钉与预应力锚杆的受力性状。结果表明:边坡分级支护后,坡体的侧移与沉降得到了有效的控制,边坡稳定安全系数明显提高,同时分析得出了土钉与预应力锚杆的受力分布规律,为此类工程设计提供了一定的参考和建议。
In order to study the classification of soil nailing and pre-stressed anchor supporting slope anchoring effect and the cooperative working performance,a fast Lagrange difference software FLAC3D was adopted to finish the numerical simulation of grading supporting on the slope around Lanzhou.A comparative analysis of the plastic zone and the safety factor was made between unreinforced and reinforced slopes according to the construction order of grading reinforced slope.The displacement change of the slope,and the force character of soil nailing and pre-stressed anchor were also studied.The results show that horizontal displacement and vertical displacement of the soil are controlled effectively,and the safety factor of slope stability is improved significantly due to the reinforcement.Inner stress distribution law of soil nailing and pre-stressed anchor are also studied.The conclusions have reference values for engineering optimum design.
In order to study the classification of soil nailing and pre-stressed anchor supporting slope anchoring effect and the cooperative working performance,a fast Lagrange difference software FLAC3D was adopted to finish the numerical simulation of grading supporting on the slope around Lanzhou.A comparative analysis of the plastic zone and the safety factor was made between unreinforced and reinforced slopes according to the construction order of grading reinforced slope.The displacement change of the slope,and the force character of soil nailing and pre-stressed anchor were also studied.The results show that horizontal displacement and vertical displacement of the soil are controlled effectively,and the safety factor of slope stability is improved significantly due to the reinforcement.Inner stress distribution law of soil nailing and pre-stressed anchor are also studied.The conclusions have reference values for engineering optimum design.
引文
[1]ZHU Y P,ZHOU Y.Analysis and Design of FrameSupporting Structure with Pre-stressed Anchor Barson Loess Slope[R].Perth:ACMSM,2004.
[2]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J].岩石力学与工程学报,2005,24(21):3922-3926.LI Zhong,ZHU Yan-peng.Stability CalculationMethods for Grillage Supporting Structure with Pres-tressed Anchor and Its Application[J].Chinese Jour-nal of Rock Mechanics and Engineering,2005,24(21):3922-3926.
[3]董建华,朱彦鹏.地震作用下土钉支护边坡稳定性分析[J].中国公路学报,2008,21(6):20-25.DONG Jian-hua,ZHU Yan-peng.Stability Analysis ofSlope Supported by Soil Nailing Retaining Wall Un-der Earthquake[J].China Journal of Highway andTransport,2008,21(6):20-25.
[4]苏永华,赵明华,李志勇,等.基于虚拟试验的边坡失稳概率分析方法[J].中国公路学报,2008,21(6):14-19.SU Yong-hua,ZHAO Ming-hua,LI Zhi-yong,et al.Instability Probability Analysis Method of SlopeBased on Dummy Test[J].China Journal of Highwayand Transport,2008,21(6):14-19.
[5]柳厚祥,廖雪,李宁,等.公路边坡稳定性分析的二维变分方法[J].中国公路学报,2007,20(4):7-11.LIU Hou-xiang,LIAO Xue,LI Ning,et al.VariationalMethod of Highway Slope Stability Analysis[J].China Journal of Highway and Transport,2007,20(4):7-11.
[6]李炜.边坡稳定性联合评价方法[J].交通运输工程学报,2010,10(5):8-11.LI Wei.Combined Evaluation Method of Slope Stabil-ity[J].Journal of Traffic and Transportation En-gineering,2010,10(5):8-11.
[7]王思长,折学森,李毅,等.基于尖点突变理论的岩质边坡稳定性分析[J].交通运输工程学报,2010,10(3):23-27.WANG Si-chang,SHE Xue-sen,LI Yi,et al.StabilityAnalysis of Rock Slope Based on Cusp CatastropheTheory[J].Journal of Traffic and Transportation En-gineering,2010,10(3):23-27.
[8]李炜,康海贵.边坡稳定性模糊随机可靠度分析[J].交通运输工程学报,2010,10(1):19-23.LI Wei,KANG Hai-gui.Fuzzy-random ReliabilityAnalysis of Slope Stability[J].Journal of Traffic andTransportation Engineering,2010,10(1):19-23.
[9]冯光乐,凌天清,许志鸿.公路边坡支护方案优化设计[J].交通运输工程学报,2002,2(1):43-47.FENG Guang-le,LING Tian-qing,XU Zhi-hong.Op-timizing Design Method of Highway Slope[J].Journalof Traffic and Transportation Engineering,2002,2(1):43-47.
[10]邵勇,覃仁辉.预应力锚索框架梁边坡支护数值模拟[J].地球科学与环境学报,2010,32(3):307-310.SHAO Yong,QIN Ren-hui.Numerical Simulation ofSlope Supporting for Prestressed Anchor with FrameBeam[J].Journal of Earth Sciences and Environment,2010,32(3):307-310.
[11]徐文杰,胡瑞林,骆祥君.一种新型的软体结构在边坡防护中的应用[J].长安大学学报:自然科学版,2008,28(5):86-90.XU Wen-jie,HU Rui-lin,LUO Xiang-jun.Applicationof a New Kind of Soft Structure to Slope Protection[J].Journal of Chang'an University:Natural ScienceEdition,2008,28(5):86-90.
[12]周勇,朱彦鹏.黄土地区框架预应力锚杆支护结构设计参数的灵敏度分析[J].岩石力学与工程学报,2006,25(增1):3115-3122.ZHOU Yong,ZHU Yan-peng.Sensitivity Analysis ofDesign Parameters of Grillage Supporting Structurewith Prestressed Anchor in Loess Region[J].ChineseJournal of Rock Mechanics and Engineering,2006,25(S1):3115-3122.
[13]曾祥勇,邓安福.锚索与锚杆联合锚固支护岩坡的有限元分析[J].岩土力学,2007,28(4):790-794.ZENG Xiang-yong,DENG An-fu.Finite ElementAnalysis of Rock Cutting Slope Reinforced by Com-bined Action of Prestressed Anchor Cable and AnchorBolt[J].Rock and Soil Mechanics,2007,28(4):790-794.
[14]冯永,王琳鸽.基坑锚杆与土钉复合支护的FLAC数值分析[J].西北地震学报,2011,33(1):56-61.FENG Yong,WANG Lin-ge.Numerical Analysis onthe Composite Support Techinque of Prestressed An-chor Arm and Brad by FLAC[J].Northwestern Seis-mological Journal,2011,33(1):56-61.
[15]韩爱民,李建国,肖军华,等.预应力锚杆框架梁的支护力学行为研究[J].岩土力学,2010,31(9):2894-2900.HAN Ai-min,LI Jian-guo,XIAO Jun-hua,et al.Me-chanical Behaviors of Frame Beam Supporting Struc-ture with Prestressed Anchors[J].Rock and Soil Me-chanics,2010,31(9):2894-2900.
[16]赵杰,邵龙潭.深基坑土钉支护的有限元数值模拟及稳定性分析[J].岩土力学,2008,29(4):983-988.ZHAO Jie,SHAO Long-tan.Numerical Simulationand Stability Analysis of Soil Nailing Support forDeep Foundation Pit by FEM[J].Rock and Soil Me-chanics,2008,29(4):983-988.
[17]张利洁,黄正加,雷菁.FLAC-3D在边坡岩体稳定性分析中的应用[J].岩土力学,2005,26(增2):61-64.ZHANG Li-jie,HUANG Zheng-jia,LEI Jing.Appli-cation of FLAC-3D to Stability Analysis of SlopeRock Mass[J].Rock and Soil Mechanics,2005,26(S2):61-64.
[18]杨有成,李群,陈新泽,等.对强度折减法若干问题的讨论[J].岩土力学,2008,29(4):1103-1106.YANG You-cheng,LI Qun,CHEN Xin-ze,et al.Dis-cussion on Strength Reduction Using FLAC[J].Rockand Soil Mechanics,2008,29(4):1103-1106.
[19]GB50330—2002,建筑边坡工程技术规范[S].GB 50330—2002,Technical Code for Building SlopeEngineering[S].
[2]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J].岩石力学与工程学报,2005,24(21):3922-3926.LI Zhong,ZHU Yan-peng.Stability CalculationMethods for Grillage Supporting Structure with Pres-tressed Anchor and Its Application[J].Chinese Jour-nal of Rock Mechanics and Engineering,2005,24(21):3922-3926.
[3]董建华,朱彦鹏.地震作用下土钉支护边坡稳定性分析[J].中国公路学报,2008,21(6):20-25.DONG Jian-hua,ZHU Yan-peng.Stability Analysis ofSlope Supported by Soil Nailing Retaining Wall Un-der Earthquake[J].China Journal of Highway andTransport,2008,21(6):20-25.
[4]苏永华,赵明华,李志勇,等.基于虚拟试验的边坡失稳概率分析方法[J].中国公路学报,2008,21(6):14-19.SU Yong-hua,ZHAO Ming-hua,LI Zhi-yong,et al.Instability Probability Analysis Method of SlopeBased on Dummy Test[J].China Journal of Highwayand Transport,2008,21(6):14-19.
[5]柳厚祥,廖雪,李宁,等.公路边坡稳定性分析的二维变分方法[J].中国公路学报,2007,20(4):7-11.LIU Hou-xiang,LIAO Xue,LI Ning,et al.VariationalMethod of Highway Slope Stability Analysis[J].China Journal of Highway and Transport,2007,20(4):7-11.
[6]李炜.边坡稳定性联合评价方法[J].交通运输工程学报,2010,10(5):8-11.LI Wei.Combined Evaluation Method of Slope Stabil-ity[J].Journal of Traffic and Transportation En-gineering,2010,10(5):8-11.
[7]王思长,折学森,李毅,等.基于尖点突变理论的岩质边坡稳定性分析[J].交通运输工程学报,2010,10(3):23-27.WANG Si-chang,SHE Xue-sen,LI Yi,et al.StabilityAnalysis of Rock Slope Based on Cusp CatastropheTheory[J].Journal of Traffic and Transportation En-gineering,2010,10(3):23-27.
[8]李炜,康海贵.边坡稳定性模糊随机可靠度分析[J].交通运输工程学报,2010,10(1):19-23.LI Wei,KANG Hai-gui.Fuzzy-random ReliabilityAnalysis of Slope Stability[J].Journal of Traffic andTransportation Engineering,2010,10(1):19-23.
[9]冯光乐,凌天清,许志鸿.公路边坡支护方案优化设计[J].交通运输工程学报,2002,2(1):43-47.FENG Guang-le,LING Tian-qing,XU Zhi-hong.Op-timizing Design Method of Highway Slope[J].Journalof Traffic and Transportation Engineering,2002,2(1):43-47.
[10]邵勇,覃仁辉.预应力锚索框架梁边坡支护数值模拟[J].地球科学与环境学报,2010,32(3):307-310.SHAO Yong,QIN Ren-hui.Numerical Simulation ofSlope Supporting for Prestressed Anchor with FrameBeam[J].Journal of Earth Sciences and Environment,2010,32(3):307-310.
[11]徐文杰,胡瑞林,骆祥君.一种新型的软体结构在边坡防护中的应用[J].长安大学学报:自然科学版,2008,28(5):86-90.XU Wen-jie,HU Rui-lin,LUO Xiang-jun.Applicationof a New Kind of Soft Structure to Slope Protection[J].Journal of Chang'an University:Natural ScienceEdition,2008,28(5):86-90.
[12]周勇,朱彦鹏.黄土地区框架预应力锚杆支护结构设计参数的灵敏度分析[J].岩石力学与工程学报,2006,25(增1):3115-3122.ZHOU Yong,ZHU Yan-peng.Sensitivity Analysis ofDesign Parameters of Grillage Supporting Structurewith Prestressed Anchor in Loess Region[J].ChineseJournal of Rock Mechanics and Engineering,2006,25(S1):3115-3122.
[13]曾祥勇,邓安福.锚索与锚杆联合锚固支护岩坡的有限元分析[J].岩土力学,2007,28(4):790-794.ZENG Xiang-yong,DENG An-fu.Finite ElementAnalysis of Rock Cutting Slope Reinforced by Com-bined Action of Prestressed Anchor Cable and AnchorBolt[J].Rock and Soil Mechanics,2007,28(4):790-794.
[14]冯永,王琳鸽.基坑锚杆与土钉复合支护的FLAC数值分析[J].西北地震学报,2011,33(1):56-61.FENG Yong,WANG Lin-ge.Numerical Analysis onthe Composite Support Techinque of Prestressed An-chor Arm and Brad by FLAC[J].Northwestern Seis-mological Journal,2011,33(1):56-61.
[15]韩爱民,李建国,肖军华,等.预应力锚杆框架梁的支护力学行为研究[J].岩土力学,2010,31(9):2894-2900.HAN Ai-min,LI Jian-guo,XIAO Jun-hua,et al.Me-chanical Behaviors of Frame Beam Supporting Struc-ture with Prestressed Anchors[J].Rock and Soil Me-chanics,2010,31(9):2894-2900.
[16]赵杰,邵龙潭.深基坑土钉支护的有限元数值模拟及稳定性分析[J].岩土力学,2008,29(4):983-988.ZHAO Jie,SHAO Long-tan.Numerical Simulationand Stability Analysis of Soil Nailing Support forDeep Foundation Pit by FEM[J].Rock and Soil Me-chanics,2008,29(4):983-988.
[17]张利洁,黄正加,雷菁.FLAC-3D在边坡岩体稳定性分析中的应用[J].岩土力学,2005,26(增2):61-64.ZHANG Li-jie,HUANG Zheng-jia,LEI Jing.Appli-cation of FLAC-3D to Stability Analysis of SlopeRock Mass[J].Rock and Soil Mechanics,2005,26(S2):61-64.
[18]杨有成,李群,陈新泽,等.对强度折减法若干问题的讨论[J].岩土力学,2008,29(4):1103-1106.YANG You-cheng,LI Qun,CHEN Xin-ze,et al.Dis-cussion on Strength Reduction Using FLAC[J].Rockand Soil Mechanics,2008,29(4):1103-1106.
[19]GB50330—2002,建筑边坡工程技术规范[S].GB 50330—2002,Technical Code for Building SlopeEngineering[S].
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