双层地基中倾斜受荷桩承载特性数值分析
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摘要
为探讨上黏下砂和上砂下黏双层地基中倾斜受荷单桩承载特性,首先基于ABAQUS建立上黏下砂与上砂下黏双层地基中长径比L/D=5和10的倾斜受荷桩3D数值分析模型,在此基础上,采用位移控制法,得到了相应工况下单桩的竖向和水平极限承载力,并运用probe法计算获得了上黏下砂及上砂下黏地基土工况下长径比L/D=5和10的桩的桩身承载力包络线。通过对上述双层地基工况下的单桩(L/D=5和10)施加与桩轴线成0°、30°、45°、60°的桩顶倾斜荷载,得到了桩身水平位移曲线、桩侧土抗力分布规律以及双层地基中上下土层的层厚比、倾斜荷载倾角、倾斜荷载大小、桩身长径比L/D等对桩身承载力、桩身水平位移的影响特性。
To analyse theload-bearing characteristics of the inclined load-bearing single-pile in the sticky sand double layer foundation. A 3D finite element analysis model of inclination load piles( L/D = 5 and 10) under sticky sand double layer foundationwasset up firstly by ABAQUS. Based on this,the vertical and horizontal ultimate bearing capacity of the single pile under the corresponding working conditions was obtained byusing the displacement control method in the upper soft clay lower sand and upper sand lower soft clay. Bearing capacity envelope of piles with L/D = 5 and 10 under soil conditions with sand-bearing groundwas obtained by using the probe method. By applying the pile top inclined loads of 0°,30°,45°,and 60° to the pile's axis for the single pile( L/D = 5 and 10) under the above double-layer ground conditions, the horizontal displacement curve of the pile and the distribution law of resistance of pile side soil and the effect of the layer thickness ratio of the upper,lower soil layers in the double-layer foundation,inclined load angle,slant load,L/D ratio of length to diameter of the pile,and the horizontal displacement of the pile body is obtained.
To analyse theload-bearing characteristics of the inclined load-bearing single-pile in the sticky sand double layer foundation. A 3D finite element analysis model of inclination load piles( L/D = 5 and 10) under sticky sand double layer foundationwasset up firstly by ABAQUS. Based on this,the vertical and horizontal ultimate bearing capacity of the single pile under the corresponding working conditions was obtained byusing the displacement control method in the upper soft clay lower sand and upper sand lower soft clay. Bearing capacity envelope of piles with L/D = 5 and 10 under soil conditions with sand-bearing groundwas obtained by using the probe method. By applying the pile top inclined loads of 0°,30°,45°,and 60° to the pile's axis for the single pile( L/D = 5 and 10) under the above double-layer ground conditions, the horizontal displacement curve of the pile and the distribution law of resistance of pile side soil and the effect of the layer thickness ratio of the upper,lower soil layers in the double-layer foundation,inclined load angle,slant load,L/D ratio of length to diameter of the pile,and the horizontal displacement of the pile body is obtained.
引文
[1]横山辛满,桩结构物的计算方法和计算实例[M].唐业清、吴庆荪译,北京:中国铁道出版社,1984.
[2]Yalcin S,Meyerhof G G.Bearing capacity of flexible piles under eccentric and inclined loads.[J].Canadian Geotechnical Journal,1994,28(1):34-42.
[3]Koumoto T,Meyerhof G G,Sastry V V R N.Analysis of bearing capacity of rigid piles under eccentric and inclined loads[J].Canadian Geotechnical Journal,1985,22(3):267-276.
[4]侯运秋,赵明华,曹喜仁.倾斜荷载下基桩的承载力研究[J].中南公路工程,1998,23(1):39-42.
[5]吴鸣,赵明华,张天翔.轴、横向荷载下桥梁基桩受力分析[J].公路工程,2001,26(1):32-34.
[6]赵明华,邹新军,邹银生,等.倾斜荷载下基桩的改进有限元-有限层分析方法[J].工程力学,2004,21(3):129-133.
[7]郑刚,王丽.竖向及水平荷载加载水平、顺序对单桩承载力的影响[J].岩土工程学报,2008,30(12):1796-1804.
[8]刘仲秋,章青,束加庆.ABAQUS软件在岩体力学参数和初始地应力场反演中的应用[J].水力发电,2008,34(6):35-37.
[9]代汝林,李忠芳,王姣.基于ABAQUS的初始地应力平衡方法研究[J].重庆工商大学学报(自然科学版),2012,29(9):76-81.
[10]YunGandMFBransby.The horizontal-moment capacity of embedded foundations in undrainedsoil[J].Canadian Geotechnical Journal,2007,44(4):409-427.
[11]Poulos HG,Davis EH.Pile foundation analysis anddesign[M].New York:Wiley,1980.
[12]赵春风,王卫中,赵程,等.砂土中竖向和弯矩荷载下单桩水平承载特性试验研究[J].岩石力学与工程学报,2013,32(1):184-190.
[13]Anagnostopoulos C,Georgiadis M.Interaction of axial and lateral pile responses[J].Journal of Geotechnical Engineering,1993,119(4):793-798.
[14]JGJ106-2014,建筑基桩检测技术规范[S].
[2]Yalcin S,Meyerhof G G.Bearing capacity of flexible piles under eccentric and inclined loads.[J].Canadian Geotechnical Journal,1994,28(1):34-42.
[3]Koumoto T,Meyerhof G G,Sastry V V R N.Analysis of bearing capacity of rigid piles under eccentric and inclined loads[J].Canadian Geotechnical Journal,1985,22(3):267-276.
[4]侯运秋,赵明华,曹喜仁.倾斜荷载下基桩的承载力研究[J].中南公路工程,1998,23(1):39-42.
[5]吴鸣,赵明华,张天翔.轴、横向荷载下桥梁基桩受力分析[J].公路工程,2001,26(1):32-34.
[6]赵明华,邹新军,邹银生,等.倾斜荷载下基桩的改进有限元-有限层分析方法[J].工程力学,2004,21(3):129-133.
[7]郑刚,王丽.竖向及水平荷载加载水平、顺序对单桩承载力的影响[J].岩土工程学报,2008,30(12):1796-1804.
[8]刘仲秋,章青,束加庆.ABAQUS软件在岩体力学参数和初始地应力场反演中的应用[J].水力发电,2008,34(6):35-37.
[9]代汝林,李忠芳,王姣.基于ABAQUS的初始地应力平衡方法研究[J].重庆工商大学学报(自然科学版),2012,29(9):76-81.
[10]YunGandMFBransby.The horizontal-moment capacity of embedded foundations in undrainedsoil[J].Canadian Geotechnical Journal,2007,44(4):409-427.
[11]Poulos HG,Davis EH.Pile foundation analysis anddesign[M].New York:Wiley,1980.
[12]赵春风,王卫中,赵程,等.砂土中竖向和弯矩荷载下单桩水平承载特性试验研究[J].岩石力学与工程学报,2013,32(1):184-190.
[13]Anagnostopoulos C,Georgiadis M.Interaction of axial and lateral pile responses[J].Journal of Geotechnical Engineering,1993,119(4):793-798.
[14]JGJ106-2014,建筑基桩检测技术规范[S].