超大直径空心独立复合桩基与群桩承载力对比
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摘要
为研究超大直径空心独立复合桩基的承载特性,确定其合理的结构形式和尺寸参数,采用数值模拟的方法,对比分析了超大直径空心独立复合桩基与传统群桩基础在竖轴向荷载、横轴向荷载下承载特性的异同。结果表明:超大直径空心独立复合桩竖轴向承载力与对应群桩基本一致,但在横轴向承载具有更优异的能力;复合桩的竖向极限承载力中端阻力占比明显大于群桩,应注意桩端承载力的验算;为合理提高复合桩的承载力,应控制桩径D<10m并保持L/D≥6,尽可能通过桩侧阻力的增长提高承载力。
In order to study the bearing characteristics of super-large diameter hollow independent composite pile foundation and determine its reasonable structural form and size parameters,the similarities and differences of bearing characteristics between super-large diameter hollow independent composite pile foundation and traditional pile group foundation under vertical and transverse axial loads were compared and analyzed by numerical simulation method.The results show that the vertical axial bearing capacity of the super large diameter hollow independent composite pile is basically the same as that of the corresponding pile group,but it has better capacity in the transverse axial bearing;the proportion of end resistance in the vertical ultimate bearing capacity of composite pile is obviously larger than that of pile group,and checking calculation of pile end bearing capacity should be paid attention to;in order to reasonably improve the bearing capacity of the composite pile,the pile diameter should be less than 10 m while the ratio of length to diameter not lower than 6,and the bearing capacity should be improved by the increase of the pile side resistance as much as possible.
In order to study the bearing characteristics of super-large diameter hollow independent composite pile foundation and determine its reasonable structural form and size parameters,the similarities and differences of bearing characteristics between super-large diameter hollow independent composite pile foundation and traditional pile group foundation under vertical and transverse axial loads were compared and analyzed by numerical simulation method.The results show that the vertical axial bearing capacity of the super large diameter hollow independent composite pile is basically the same as that of the corresponding pile group,but it has better capacity in the transverse axial bearing;the proportion of end resistance in the vertical ultimate bearing capacity of composite pile is obviously larger than that of pile group,and checking calculation of pile end bearing capacity should be paid attention to;in order to reasonably improve the bearing capacity of the composite pile,the pile diameter should be less than 10 m while the ratio of length to diameter not lower than 6,and the bearing capacity should be improved by the increase of the pile side resistance as much as possible.
引文
[1]冯忠居.大直径钻埋预应力混凝土空心桩承载性能的研究[D].西安:长安大学,2003.
[2]王振,冯忠居,吴敬武,等.超配筋超大直径桩基完整性综合评价[J].筑路机械与施工机械化,2017,34(10):119-122,128.
[3]冯忠居,刘闯,戴良军,等.中国海洋环境桥梁大直径深长桩基的应用研究[J].筑路机械与施工机械化,2017,34(11):46-50.
[4]冯忠居,谢永利.大直径钻埋预应力混凝土空心桩承载力的试验[J].长安大学学报(自然科学版),2005,25(2):50-54.
[5]李志刚,张雁,朱合华.预应力高强空心桩(管桩和方桩)工程应用分析[J].建筑结构,2014,44(8):1-5,14.
[6]李晋,唐勇,谢永利.横轴向荷载作用下空心桩受力性状数值仿真[J].路基工程,2009(1):20-21.
[7]冯忠居,魏炜.大直径钻埋预应力空心桩结构承载力计算[J].长安大学学报(自然科学版),2005,25(3):49-53.
[8]冯忠居,上官兴,谢永利.大直径钻埋预应力混凝土空心桩施工工艺[J].筑路机械与施工机械化,2005,22(8):42-43.
[9]李晋.大直径钻埋预应力混凝土空心桩受力性状仿真分析[D].西安:长安大学,2003.
[10]李晋,谢永利,冯忠居.桩身设计参数对大直径空心桩承载性状影响的仿真分析[J].公路交通科技,2005(9):102-105.
[11]李晋,冯忠居,谢永利.大直径空心桩承载性状的数值仿真[J].长安大学学报(自然科学版),2004,24(4):36-39.
[12]李晋,谢永利,冯忠居.土体参数对大直径空心桩承载性状影响的仿真分析[J].工程地质学报,2005,13(1):129-134.
[13]刘永超,王清龙,朱明亮.有效应力对预应力空心桩力学性能的影响分析[J].岩土工程学报,2013,35(S2):1130-1133.
[14]张子良,张恽.自平衡下沉大直径管桩[J].岩土工程学报,2013,35(S2):1180-1183.
[15]张永谋,闫强刚.受横向动载的空心桩性能研究[J].兰州交通大学学报,2010,29(6):10-15.
[16]石庆瑶,王成.水平荷载作用下长桩的合理截面形式优化研究[J].岩土力学,2008,29(S1):650-654.
[17]张新敏,喻小明,蒋中明.大直径混凝土空心桩优化设计研究[J].中外公路,2007,27(4):196-199.
[18]徐秀香.大直径挖孔空心桩的实用探讨[J].施工技术,2006(6):106.
[19]蒋中明,喻小明,张新敏.现浇混凝土薄壁管桩与土体共同作用的三维数值分析[J].中外公路,2005,25(4):90-92.
[2]王振,冯忠居,吴敬武,等.超配筋超大直径桩基完整性综合评价[J].筑路机械与施工机械化,2017,34(10):119-122,128.
[3]冯忠居,刘闯,戴良军,等.中国海洋环境桥梁大直径深长桩基的应用研究[J].筑路机械与施工机械化,2017,34(11):46-50.
[4]冯忠居,谢永利.大直径钻埋预应力混凝土空心桩承载力的试验[J].长安大学学报(自然科学版),2005,25(2):50-54.
[5]李志刚,张雁,朱合华.预应力高强空心桩(管桩和方桩)工程应用分析[J].建筑结构,2014,44(8):1-5,14.
[6]李晋,唐勇,谢永利.横轴向荷载作用下空心桩受力性状数值仿真[J].路基工程,2009(1):20-21.
[7]冯忠居,魏炜.大直径钻埋预应力空心桩结构承载力计算[J].长安大学学报(自然科学版),2005,25(3):49-53.
[8]冯忠居,上官兴,谢永利.大直径钻埋预应力混凝土空心桩施工工艺[J].筑路机械与施工机械化,2005,22(8):42-43.
[9]李晋.大直径钻埋预应力混凝土空心桩受力性状仿真分析[D].西安:长安大学,2003.
[10]李晋,谢永利,冯忠居.桩身设计参数对大直径空心桩承载性状影响的仿真分析[J].公路交通科技,2005(9):102-105.
[11]李晋,冯忠居,谢永利.大直径空心桩承载性状的数值仿真[J].长安大学学报(自然科学版),2004,24(4):36-39.
[12]李晋,谢永利,冯忠居.土体参数对大直径空心桩承载性状影响的仿真分析[J].工程地质学报,2005,13(1):129-134.
[13]刘永超,王清龙,朱明亮.有效应力对预应力空心桩力学性能的影响分析[J].岩土工程学报,2013,35(S2):1130-1133.
[14]张子良,张恽.自平衡下沉大直径管桩[J].岩土工程学报,2013,35(S2):1180-1183.
[15]张永谋,闫强刚.受横向动载的空心桩性能研究[J].兰州交通大学学报,2010,29(6):10-15.
[16]石庆瑶,王成.水平荷载作用下长桩的合理截面形式优化研究[J].岩土力学,2008,29(S1):650-654.
[17]张新敏,喻小明,蒋中明.大直径混凝土空心桩优化设计研究[J].中外公路,2007,27(4):196-199.
[18]徐秀香.大直径挖孔空心桩的实用探讨[J].施工技术,2006(6):106.
[19]蒋中明,喻小明,张新敏.现浇混凝土薄壁管桩与土体共同作用的三维数值分析[J].中外公路,2005,25(4):90-92.