柔性双排长短组合桩滑坡推力的计算方法
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摘要
双排长短组合桩是一种新的桩型,能够克服常见双排桩的不足,具有很好的工程应用前景,研究其滑坡推力的计算方法具有重要意义。在Winkler弹性地基梁模型的基础上,充分考虑受荷段与嵌固段的变形协调关系,结合极限平衡条件,推导了当抗滑桩为柔性桩时,桩后滑坡推力呈梯形分布时,双排长短组合桩的前、后排桩滑坡推力的计算方法。对比理论计算结果和模型试验的监测数据可知,后排桩桩身滑坡推力的计算值与试验值的误差为7%,前排桩的误差为14.4%。因此,证明了运用该方法计算双排长短组合桩的滑坡推力是可行的。
Double row long-short piles are new type of pile foundations, which can make up for the deficiency of common double-row piles and shows a good potential of engineering application. It is important to study the calculation method of landslide thrust. Based on the model of Winkler elastic foundation beam, considering the deformation coordination between the loading segment and anchoring segment and limit equilibrium condition, calculation method of the landslide thrust of the flexible pile is derived. Distribution form of landslide thrust behind the pile is trapezoidal. Comparing the theoretical calculation results and the monitoring data of model test, it is found that the error of the landslide thrust calculation value of rear-row pile is 7% to the experimental results, and the error of fore-row pile is 14.4%. Therefore, it is proved that the calculation method of landslide thrust of the double row long-short piles are feasible.
Double row long-short piles are new type of pile foundations, which can make up for the deficiency of common double-row piles and shows a good potential of engineering application. It is important to study the calculation method of landslide thrust. Based on the model of Winkler elastic foundation beam, considering the deformation coordination between the loading segment and anchoring segment and limit equilibrium condition, calculation method of the landslide thrust of the flexible pile is derived. Distribution form of landslide thrust behind the pile is trapezoidal. Comparing the theoretical calculation results and the monitoring data of model test, it is found that the error of the landslide thrust calculation value of rear-row pile is 7% to the experimental results, and the error of fore-row pile is 14.4%. Therefore, it is proved that the calculation method of landslide thrust of the double row long-short piles are feasible.
引文
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[12]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 Shi-guo,HE Hong.An approximate analytical method for calculating thrust on double-row stabilizing piles[J].Rock and Soil Mechanics,2015,36(2):376-380.
[13]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.Second Survey and Design Institute of the Ministry of Railways.Design and calculation of anti slide pile[M].Beijing:China Railway Publishing House,1983.
[14]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,2010.LI Hai-guang.Design and engineering example of new retaining structure[M].Beijing:China Communications Press,2004.
[15]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2002,21(4):517-521.DAI Zi-hang.Study on distribution law of landslidethrust and resistance of sliding mass acting on stabilizing piles[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(4):517-521.
[2]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(增刊1):3162-3168.TANG Fen,ZHENG Ying-ren,YANG Bo.Thrust share ratios and optimization design for two-rowanti-slide piles[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(Supp.1):3162-3168.
[3]李天斌,刘吉,任洋,等.预加固高填方边坡的滑动机制:攀枝花机场12#滑坡[J].工程地质学报,2012,20(5):723-731.LI Tian-bin,LIU Ji,REN Yang,et al.Sliding mechanism of high-fill slope with pre-reinforced piles at Panzhihua airport[J].Journal of Engineering Geology,2012,20(5):723-731.
[4]申永江,杨明,项正良.双排长短组合桩与常见双排桩的对比研究[J].岩土工程学报,2015,37(增刊2):96-100.SHEN Yong-jiang,YANG Ming,XIANG Zheng-liang.Comparative study on double-row piles with different lengths several common anti-slide piles[J].Chinese Journal of Geotechnical Engineering.2015,37(Supp.2):96-100.
[5]XIAO S,ZENG J,YAN Y.A rational layout of double-row stabilizing piles for large-scale landslide control[J].Bulletin of Engineering Geology&the Environment,2016,76(1):1-13.
[6]毛坚强,徐骏,杨磊.滑体段采用m法模型的抗滑桩计算方法[J].岩土力学,2018,39(4):1197-1202.MAO Jian-qiang,XU Jun,YANG Lei.An improved method for stabilising pile by using m-method model to the whole pile[J].Rock and Soil Mechanics,2018,39(4):1197-1202.
[7]吕美君,晏鄂川.埋入式双排抗滑桩滑坡推力分配研究[J].岩石力学与工程学报,2005,24(增刊1):4867-4867.LüMei-jun,YAN E-chuan.Study on distribution laws of landslide-thrust in double-row fixed stabilizing piles[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.1):4867-4867.
[8]孙勇.滑坡面下双排抗滑结构的计算方法研究[J].岩土力学,2009,30(10):2971-2977.SUN Yong.Research on calculation method of double-row anti-sliding structure under sliding surface[J].Rock and Soil Mechanics,2009,30(10):2971-2977.
[9]于洋,孙红月,尚岳全.基于桩周土体位移的双排抗滑桩计算模型[J].岩石力学与工程学报,2014,33(1):172-178.YU Yang,SUN Hong-yue,SHANG Yue-quan.Calculation model of double-row stabilizing piles based on displacement of soil around piles[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(1):172-178.
[10]刘鸿.双排抗滑桩计算方法研究[D].成都:西南交通大学,2007.LIU Hong.Investigation on double-row anti-sliding piles[D].Chengdu:Southwest Jiaotong University,2007.
[11]申永江,孙红月,尚岳全,等.滑坡推力在悬臂式双排抗滑桩上的分配[J].岩石力学与工程学报,2012,31(增刊1):2668-2673.SHEN Yong-jiang,SUN Hong-yue,SHANG Yue-quan,et al.Distribution of landslide thrust on cantilever double-row anti-sliding piles[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(Supp.1):2668-2673.
[12]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 Shi-guo,HE Hong.An approximate analytical method for calculating thrust on double-row stabilizing piles[J].Rock and Soil Mechanics,2015,36(2):376-380.
[13]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.Second Survey and Design Institute of the Ministry of Railways.Design and calculation of anti slide pile[M].Beijing:China Railway Publishing House,1983.
[14]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,2010.LI Hai-guang.Design and engineering example of new retaining structure[M].Beijing:China Communications Press,2004.
[15]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2002,21(4):517-521.DAI Zi-hang.Study on distribution law of landslidethrust and resistance of sliding mass acting on stabilizing piles[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(4):517-521.