双排抗滑桩的受力特性研究——以柳家坡2号滑坡治理工程为例
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摘要
岚皋县柳家坡2号滑坡的推力和规模较大,单排桩或者一般的支挡结构已经无法满足抗滑力的要求。而双排抗滑桩在满足抗滑力的同时,更具有刚度大、稳定性高等特点。为了研究岚皋县柳家坡2号滑坡在治理过程中双排抗滑桩各排桩分担的滑坡推力的大小,通过对前后两排桩进行单独受力分析,推导出桩身变形推力的计算公式;通过对双排桩治理后的滑坡进行二维模拟,对滑坡的稳定性、应力与应变以及双排桩的弯矩与剪力进行深入的探究分析。研究表明,抗滑桩在滑面处及锚固段中部受到的剪力最大,且后排桩相较前排桩所承受的滑坡推力更大,这为抗滑桩的设计计算提供了参考意义。
The Liujiapo No.2 landslide in Langao County has large thrust and scale,so the single-row pile or general retaining structure cannot meet the demand of anti-sliding force when the thrust of the landslide achieves 2000 KN/m.It is also difficult to accomplish the construction under the tough topographic conditions and limited land acquisition in the Liujiapo No.2 landslide.But the double-row anti-slide pile has many benfits of large stiffness,wonderful stability and favorable stress,which is commendably fulfilled the demand of anti-sliding force.In order to study the magnitude of landslide thrust shared by two rows of anti-slide piles in Liujiapo 2 landslide in Langao county,the each force of double-row anti-slide piles has been analyzed separately,and the calculation formula of pile body deformation thrust has been deduced for the elastic foundation beam.The Midas/GTS has been used to analyze the two-dimensional pile under the control of double-row piles,and then the line charts of shear force and the bending moment of landslide anti-slide pile have been obtained.The study not only shows that the shearing force of anti-slide pile is greatest at sliding surface and middle of anchorage section,but also that the back piles bears more landslide thrust than the front ones,which provides reference for the calculation of the reinforcement of anti-slide piles on landslides.
The Liujiapo No.2 landslide in Langao County has large thrust and scale,so the single-row pile or general retaining structure cannot meet the demand of anti-sliding force when the thrust of the landslide achieves 2000 KN/m.It is also difficult to accomplish the construction under the tough topographic conditions and limited land acquisition in the Liujiapo No.2 landslide.But the double-row anti-slide pile has many benfits of large stiffness,wonderful stability and favorable stress,which is commendably fulfilled the demand of anti-sliding force.In order to study the magnitude of landslide thrust shared by two rows of anti-slide piles in Liujiapo 2 landslide in Langao county,the each force of double-row anti-slide piles has been analyzed separately,and the calculation formula of pile body deformation thrust has been deduced for the elastic foundation beam.The Midas/GTS has been used to analyze the two-dimensional pile under the control of double-row piles,and then the line charts of shear force and the bending moment of landslide anti-slide pile have been obtained.The study not only shows that the shearing force of anti-slide pile is greatest at sliding surface and middle of anchorage section,but also that the back piles bears more landslide thrust than the front ones,which provides reference for the calculation of the reinforcement of anti-slide piles on landslides.
引文
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晏同珍.滑坡学[M].武汉:中国地质大学出版社,2000.YAN Tongzhen.Landslidologies[M].Wuhan:China University of Geosciences Press,2000.
李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004:261-268.LI Haiguang.Design and Engineering Examples of New Type Support Structure[M].Beijing:China Communication Press,2004:261-268.
唐芬,郑颖人,杨波.双排抗滑桩的推力分担及优化设计[J].岩石力学与工程学报,2010,29(Z1):3162-3168.TANG Fen,ZHENG Yingren,YANG Bo.Thrust Share Ratios And Optimization Design For Two-row Antislide Piles[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(Z1):3162-3168.
陈曦.双排抗滑桩滑坡推力计算方法研究[D].成都:西南交通大学,2010.CHEN Xi.Study on Calculation Method on Landslide Thrust for Two-row Anti-slide Piles[D].Chengdu:Southwest Jiaotong University,2010.
刘小丽.新型桩锚结构设计计算理论研究[D].西南交通大学,2003:41-45.LIU Xiaoli.Study on Designing and Computing Theory of New Pattern Plie-anchor Structures[D].Chengdu:Southwest Jiaotong University,2003:41-45.
肖世国,何洪.双排抗滑桩上滑坡推力近似解析方法[J].岩土力学,2015,36(2):376-380.XIAO Shiguo,HE Hong.An approximate analytical method for calculating thrust on double-row stabilizing piles[J].Rock and Soil Mechanics,2015,36(2):376-380.
张友良,陈从新,夏元友.杆件有限单元法在抗滑桩设计中的应用研究[J].中国地质灾害与防治学报,2000,11(1):30-32,40.ZHANG Youliang,CHEN Congxin,XIA Yuanyou.Study on The Application of FEM to The Design of Anti-sliding Piles[J].The Chinese Journal of Geological Hazard and Control,2000,11(1):30-32,40.
王旭,晏鄂川,吕美君.埋入式双排桩一土体系桩间内力分配的模拟[J].煤田地质与勘探,2006,11(8):9-11.WANG Xu,YAN Echuan,LüMeijun.Simulation of Internal Force Distribution of Embedded Double-row Antislide Piles Using FEM[J].Coal Geology and Exploration,2006,11(8):9-11.
薛强,张茂省.延安淹土安滑坡监测预警及变形特征[J].西北地质,2018,51(2):220-226XUE Qiang,ZHANG Maosheng.Monitoring,Early Warning and Deformation Characteristics of Yantu'an Landslide in Yan'an[J].Northwestern Geology,2018,51(2):220-226.
赵法锁,彭建兵,毛彦龙,等.平面旋转变形边坡及形成条件初探[J].西北地质科学,1999,20(1):57-65.ZHAO Fasuo,PENG Jianbing,MAO Yanlong,et al.Initial Inquiry on the plane rotary deformable slope and its emerging conditions[J].Northwest Geoscience,1999,20(1):57-65.
王贵荣.陕西紫阳-岚皋一带地质灾害特征及防治对策[J].西安科技大学学报,2002,22(3):291-294.WANG Guirong.Features and Prevention-treatment Countermeasure of Geological Hazards in Ziyang and Lan'gao,Shaanxi[J].Journal of Xi'an University of Science and Technology,2002,22(3):291-294.
王佳运,石小亚,武立,等.“8·12”山阳滑坡视向滑动成因机理[J].西北地质,2018,51(3):232-239.WANG Jiayun,SHI Xiaoya,WU Li,et al.Formation Mechanism of Apparent Dip Slide in the Shanyang“8.12”Landslide[J].Northwestern Geology,2018,51(3):232-239.
边俊鹏.义子头滑坡治理设计及数值模拟研究[D].西安:长安大学,2017.BIAN Junpeng.YiZiTou Landslide Treatment Design and The Study of Numerical Simulation[D].Xi'an:Chang'an University,2017.
陈春利,贺凯,李同录.坡脚开挖诱发古滑坡复活的机制分析[J].西北地质,2014,49(1):255-260.CHEN Chunli,HE Kai,LI Tonglu.Research on the Mechanism of the Ancient Landslide Resurrection Triggered by Slope Toe Excavation[J].Northwestern Geology,2014,49(1):255-260.
唐永忠,杨兴科,张宝荣,等.南秦岭造山带安康石梯-旬阳神河早古生代热水沉积盆地构造-沉积相与热水聚矿特征[J].中国地质,2012,39(5):1261-1270.TANG Yongzhong,YANG Xingke,ZHANG Baorong,et al.Structure-sedimentary facies and hydrothermal mineralization characteristics of Shiti(in Ankang)-Shenhe(in Xunyang)Early Paleozoic hydrothermal basin in South Qinling orogenic belt[J].Geology in China,2012,39(5):1261-1270.
张莹.断裂控制的滑坡分布规律及机理研究-以柳家坡滑坡为例[D].西安:长安大学,2013.ZHANG Ying.Study on Distribution Law and Mechanism of FaultControlled Landslides[D].Xi'an Chang'an University,2013.
李俊飞.双排埋入式抗滑桩工作机理分析与研究[D].重庆:重庆大学,2009.LI Junfei.Study on Double-row Sunken Anti-slide Plies and Their Mechanism[D].Chongqing:Chongqing University,2009.
李明康.加固滑坡的双排抗滑桩合理排距分析[D].重庆:西南交通大学,2013.LI Mingkang.Analysis of Reasonable Row Spacing Between Double-row Anti-slide Plies in Landslide Contorl[D].Chungqing:Southwest Jiaotong University,2013.
晏同珍.滑坡学[M].武汉:中国地质大学出版社,2000.YAN Tongzhen.Landslidologies[M].Wuhan:China University of Geosciences Press,2000.
李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004:261-268.LI Haiguang.Design and Engineering Examples of New Type Support Structure[M].Beijing:China Communication Press,2004:261-268.