高陡横坡段桥梁双桩结构计算方法研究
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摘要
针对山区高陡横坡地段桥梁双桩基础的结构与荷载特征,建立了桩基与边坡及桩间土相互作用新模式:后桩承受推力以滑动面为界简化为滑坡推力与主动土压力;前桩与后桩所承受的侧土抗力则服从(mz+C)的线性增长规律;并假定桩间土对前桩的作用力q\-a是桩间距、桩宽(桩径)及滑坡体宽度的函数,由此可充分反映桩间土及滑坡体对土压力传递的影响。在此基础上,导得不同特征桩段的微分方程,并基于有限差分解进行了求解,从而提出了高陡横坡段桥梁双桩结构内力位移计算方法。理论计算与室内模型试验实测数据的对比表明,该方法误差可满足工程要求。
According to the structure and load characteristics of bridge double-pile foundation in high-steep transverse slope,a new model of pile-soil-slope interaction was established:The back pile born thrust was simplified as slope sliding thrust and active earth pressure at critical sliding surface,lateral soil resistance of the double piles obeys the linear growth rule(mz+C),and the acting force of inter-pile soil to front pile was assumed as the function of pile space,pile width(diameter) and sliding body width,which can fully reflect the effect of inter-pile soil and sliding body on the soil pressure transmission.Then,the differential equations of pile sections with different characteristics were deduced,and the displacement calculation method of the structure was obtained by finite difference solution.The comparison between theoretical solutions and laboratory model test data shows that the error of this method meets the requirements of practical engineering.
According to the structure and load characteristics of bridge double-pile foundation in high-steep transverse slope,a new model of pile-soil-slope interaction was established:The back pile born thrust was simplified as slope sliding thrust and active earth pressure at critical sliding surface,lateral soil resistance of the double piles obeys the linear growth rule(mz+C),and the acting force of inter-pile soil to front pile was assumed as the function of pile space,pile width(diameter) and sliding body width,which can fully reflect the effect of inter-pile soil and sliding body on the soil pressure transmission.Then,the differential equations of pile sections with different characteristics were deduced,and the displacement calculation method of the structure was obtained by finite difference solution.The comparison between theoretical solutions and laboratory model test data shows that the error of this method meets the requirements of practical engineering.
引文
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[11]赵明华,邬龙刚,刘建华.基于p-y曲线法的承重阻滑桩内力及位移分析[J].岩石力学与工程学报,2007,26(6):1220-1225.ZHAO Minghua,WU Longgang,LIU Jianhua.Inner-forceand Displacement Analysis of Load-bearing and Anti-slide PilesBy p-y Curve Method[J].Chinese Journal of Rock Mechan-ics and Engineering,2007,26(6):1220-1225.
[12]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 Zihang.Study on Distribution Laws of Landaide-thrust andResistance of Sliding Mass Acting on Antislide Piles[J].Chi-nese Journal of Rock Mechanics and Engineering,2002,21(4):517-521.
[2]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.Research on Calculation Methodfor Double-piles[J].Seismological Research of NortheastChina,2001,17(2):64-68.
[3]万智,王贻荪,李刚.双排桩支护结构的分析与计算[J].湖南大学学报:自然科学版,2001,28(3):116-131.WAN Zhi,WANG Yisun,LI Gang.Analysis and Calculationof Retaining Structure with Double-row piles[J].Journal ofHunan University:Natural Science Edition,2001,28(3):116-131.
[4]王旭,晏鄂川,吕美君.埋入式双排桩-土体系桩间内力分配的模拟[J].煤田地质与勘探,2006,34(4):57-60.WANG Xu,YAN E’chuan,LV Meijun.Simulation of Inter-nal Force Distribution of Embedded Double-row Anti-slide Pilesusing FEM[J].Coal Geology&Exploration,2006,34(4):57-60.
[5]蔡袁强,赵永倩,吴世明,等.软土地基深基坑中双排桩式围护结构有限元分析[J].浙江大学学报:工学版,1997,31(4):442-448.CAI Yuanqiang,ZHAO Yongqian,WU Shiming,et al.FEMAnalysis of the Deep Pit Excavation with Retaining Structure ofDouble Piles in Soft Clay[J].Journal of Zhejiang University:Natural Science Edition,1997,31(4):442-448.
[6]蔡袁强,阮连法,吴世明,等.软粘土地基基坑开挖中双排桩式围护结构的数值分析及应用[J].建筑结构学报,1999,20(4):65-71.CAI Yuanqiang,RUAN Lianfa,WU Shiming,et al.FiniteElement Analysis and Application of Deep Excavation with Re-taining Structure of Double-row piles in Soft Clay[J].Journalof Building Structure,1999,20(4):65-71.
[7]崔宏环,张立群,赵国景.深基坑开挖中双排桩支护的三维有限元模拟[J].岩土力学,2006,27(4):662-666.CUI Honghua,ZHANG Liqun,ZHAO Guojing.NumericalSimulation of Deep Foundation Pit Excavation with Double-rowpiles[J].Rock and Soil Mechanics,2006,27(4):662-666.
[8]杨明辉,赵明华,曹文贵,等.高陡边坡桥梁基桩内力计算的幂级数解[J].中南大学学报:自然科学版,2007,38(3):561-566.YANG Minghui,ZHAO Minghua,CAO Wengui,et al.Pow-er-progression Solution for Inner-force Analysis of Bridge Pilein Steep Slope[J].Journal of Zhongnan University:NaturalScience Edition,2007,38(3):561-566.
[9]杨明辉,孙绪峰.边坡滑移情况下陡坡桥梁基桩受力特性影响因素对比试验研究[J].公路工程,2008,33(3):10-13.YANG Minghui,SUN Xufeng.Influence Factors ComparisonModel Study on Loading Characteristic of Bridge Pile in SteepSlope When the Slope Sliding[J].Highway Engineering,2008,33(3):10-13.
[10]刘建华,赵明华,杨明辉.高陡岩质边坡上桥梁基桩模型试验研究[J].岩土工程学报,2009,31(3):372-377.LIU Jianhua,ZHAO Minghua,YANG Minghui.Model Testson Bridge Pile Foundation in High and Steep Rock Slopes[J].Chinese Journal of Geotechnical Engineering,2009,31(3):372-377.
[11]赵明华,邬龙刚,刘建华.基于p-y曲线法的承重阻滑桩内力及位移分析[J].岩石力学与工程学报,2007,26(6):1220-1225.ZHAO Minghua,WU Longgang,LIU Jianhua.Inner-forceand Displacement Analysis of Load-bearing and Anti-slide PilesBy p-y Curve Method[J].Chinese Journal of Rock Mechan-ics and Engineering,2007,26(6):1220-1225.
[12]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 Zihang.Study on Distribution Laws of Landaide-thrust andResistance of Sliding Mass Acting on Antislide Piles[J].Chi-nese Journal of Rock Mechanics and Engineering,2002,21(4):517-521.
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