双排微型抗滑桩的抗滑效果
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摘要
考虑到高速公路边坡的安全性,为了掌握潜在滑移体的滑动趋势,评价双排微型抗滑桩的安全性,验证理论计算方法的合理性,对通平高速公路某边坡实施双排微型抗滑桩施工,并且对加固边坡进行坡体位移、桩顶位移和桩侧压力监测。此边坡为普遍存在的含有软弱夹层的强风化岩石边坡。通过监测结果发现潜在滑移体和固定坡体没有明显位移差,桩顶位移略小,且变化速度明显减小。在有限元力学分析的基础上,对比发现在承受相同下滑力时,双排微型抗滑桩桩顶位移较普通悬臂桩减少27.88%。在理论分析的基础上阐述边坡加固后的动态稳定性,得出双排微型抗滑桩前后桩的受力比例、受力分布等情况,比普通抗滑桩加固效果更好,桩顶和坡顶位移更小,为以后此类边坡和双排微型抗滑桩的应用设计提供一定的帮助。
In order to understand the potential sliding trend of the sliding body,the safety of such anti-slide micropiles was evaluated,the theoretical calculation method was evaluated and the safety of side slope of the expressway and the slope body position shift was considered.The double-row anti-slide micropiles were built on to a certain side slope of Tongping expressway and pile top displacement and pile side pressure were monitored to the reinforced slope.No obvious displacements of the potential sliding body and fixed slope were found in the monitored results,and the pile top displacement was on the small side and the rate greatly decreased.Based on the finite element mechanics analysis,the pile top displacement was reduced by 27.88%,under the same sliding power,compared with the ordinary cantilever pile.The dynamic stability of reinforced side slope was elaborated on the basis of theoretical analysis.The double-row anti-slide micropiles’ stress ratio and stress distribution were obtained,which were better than the general anti-slide pile reinforcement.The research can offer help to the application of double-row anti-slide micropiles to the similar side slopes.
In order to understand the potential sliding trend of the sliding body,the safety of such anti-slide micropiles was evaluated,the theoretical calculation method was evaluated and the safety of side slope of the expressway and the slope body position shift was considered.The double-row anti-slide micropiles were built on to a certain side slope of Tongping expressway and pile top displacement and pile side pressure were monitored to the reinforced slope.No obvious displacements of the potential sliding body and fixed slope were found in the monitored results,and the pile top displacement was on the small side and the rate greatly decreased.Based on the finite element mechanics analysis,the pile top displacement was reduced by 27.88%,under the same sliding power,compared with the ordinary cantilever pile.The dynamic stability of reinforced side slope was elaborated on the basis of theoretical analysis.The double-row anti-slide micropiles’ stress ratio and stress distribution were obtained,which were better than the general anti-slide pile reinforcement.The research can offer help to the application of double-row anti-slide micropiles to the similar side slopes.
引文
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[14]刘小丽.新型桩锚结构设计计算理论研究[D].成都:西南交通大学土木工程学院,2003:73-86.LIU Xiaoli.Calculation theory research of anti-sliding pile with prestressed anchor cable[D].Chengdu:Southwest Jiaotong University School of Civil Engineering,2003:73-86.
[15]冯紫良,戴仁杰.杆系结构的计算机分析[M].上海:同济大学出版社,1991:183-178.FENG Ziliang,DAI Renjie.Computer analysis to the structure of bar system[M].Shanghai:Tongji University Press,1991:183-178.
[16]张友良,陈从新,夏元友.杆件有限元单元法在抗滑桩设计中的应用研究[J].中国地质与防治学报,2000,11(1):30-32.ZHANG Youliang,CHEN Congxin,XIA Yuanyou.A finite element element method in the research on the application of traditional anti-slide pile design[J].The Chinses Journal of Geological Hazard and Control,2000,11(1):30-32.
[2]Shields D R.Buckling of micro-piles[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2007,133(3):334-337.
[3]龚健,陈仁朋,陈云敏,等.微型桩原型水平荷载试验研究[J].岩石力学与工程学报,2004,23(20):3541-3546.GONG Jian,CHEN Renpeng,CHEN Yunmin,et al.Prototype testing study on micropiles under lateral loading[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(20):3541-3546.
[4]周德培,王唤龙,孙宏伟.微型桩组合抗滑结构及其设计理论[J].岩石力学与工程学报,2009,28(7):1353-1362.ZHOU Depei,WANG Huanlong,SUN Hongwei.Micro-pile composite structure and its design theory[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1353-1362.
[5]王湛,刘冰花.双排桩计算方法探讨[J].东北地震研究,2001,17(2):64-68.WANG Zhan,LIU Binghua.The study on calculation method of double-row piles[J].Seismological Research of Northeast China,2001,17(2):64-68.
[6]何颐华,杨斌,金宝森,等.双排护坡桩试验与计算得研究[J].建筑结构学报,1996,17(2):58-66.HE Yihua,YANG Bin,JIN Baosen.Test and computing of H-type anti-slide pile[J].Journal of Building Structures,1996,17(2):58-66.
[7]周翠英,刘祚秋,尚伟,等.门架式双排抗滑桩设计计算新模式[J].岩土力学,2005,26(3):441-444.ZHOU Cuiying,LIU Zuoqiu,SHANG Wei,et al.A new mode for calculation of portal double row anti-sliding piles[J].Rock and Soil Mechanics,2005,26(03):441-444.
[8]李云华,傅小茜,王珣.多排抗滑桩设计中的推力分担比模拟[J].岩土工程技术,2009,23(4):197-200.LI Yunhua,FU Xiaoqian,WANG Xun.Simulate of the thrust-sharing in designed multi-row anti-slide piles[J].Geotechnical Engineering Technique,2009,23(4):197-200..
[9]蒋斌松,赵锦桥,孙志刚,等.枣林滑坡的滑面强度确定及加固处理[J].工程地质学报,2004,12(4):417-421.JIANG Binsong,ZHAO Jinqiao,SUN Zhigang,et al.Shear strength of the sliding plane at Zaolin Landslide and its reinforcement[J].Journal of Engineering Geology,2004,12(4):417-421.
[10]李爱兵,周先明,段恒健.软岩露天边坡综合治理的研究[C]//第六次全国岩石力学与工程学术大会论文集.北京:科学出版社,2000:487-490.LI Aibing,ZHOU Xianming,DUAN Hengjian.Study of comprehensive control of weak rocks in an open pit[C]//Proceedings of the6th Rock Mechanics and Engineering Conference.Beijing:Science Press,2000:487-490.
[11]阮波,李亮,刘宝琛,等.浒家洞滑坡治理工程监测分析[J].岩石力学与工程学报,2005,24(8):l445-l449.RUAN Bo,LI Liang,LIU Baochen,et al.Analysis on deformation monitoring and tendency of xujiadong landslide[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):l445-l449.
[12]申永江,孙红月,尚岳全,等.基于测斜数据的抗滑桩工作状态评价[J].岩石力学与工程学报,2009,28(2):3591-3596.SHEN Yongjiang,SUN Hongyue,SHANG Yuequan,et al.Evaluation of state of anti-slide piles based on inclinometer data[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(2):3591-3596.
[13]王勖成,邵敏.有限单元法基本原理与数值方法[M].北京:清华大学出版社,1997:432-451.WANG Maocheng,SHAO Min.The basic principle and the numerical method of the finite element method[M].Beijing:Tsinghua University Press,1997:432-451..
[14]刘小丽.新型桩锚结构设计计算理论研究[D].成都:西南交通大学土木工程学院,2003:73-86.LIU Xiaoli.Calculation theory research of anti-sliding pile with prestressed anchor cable[D].Chengdu:Southwest Jiaotong University School of Civil Engineering,2003:73-86.
[15]冯紫良,戴仁杰.杆系结构的计算机分析[M].上海:同济大学出版社,1991:183-178.FENG Ziliang,DAI Renjie.Computer analysis to the structure of bar system[M].Shanghai:Tongji University Press,1991:183-178.
[16]张友良,陈从新,夏元友.杆件有限元单元法在抗滑桩设计中的应用研究[J].中国地质与防治学报,2000,11(1):30-32.ZHANG Youliang,CHEN Congxin,XIA Yuanyou.A finite element element method in the research on the application of traditional anti-slide pile design[J].The Chinses Journal of Geological Hazard and Control,2000,11(1):30-32.
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