水平-竖向耦合荷载下单桩承载性状数值分析
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摘要
为了研究单桩基础在水平-竖向耦合荷载下的承载性状,以工程实例为基础,通过数值计算的手段建立了均质海相软黏土层中单桩受耦合荷载的计算模型,研究均质土层中竖向与水平耦合荷载作用下单桩的承载力、变形特点。结果表明:当施加的水平力未超过临界荷载,水平力的施加对单桩竖向承载力无影响;当施加的水平力超过临界荷载,水平力的施加对单桩竖向承载力有着不利的影响;水平力的施加延缓了竖向抗拔承载力破坏点的出现,且随着施加的水平力的增大,抗拔极限破坏点出现得越晚,水平力的施加提高了单桩抗拔承载力;预先施加竖向力会减小水平力产生的桩顶水平位移,提高单桩水平承载力;且存在一个最优的竖向荷载,使得桩顶水平位移最小,桩身弯矩最小。
In order to study the bearing behavior of single pile foundation under horizontal vertical coupling load,the calculation model of single pile based on the engineering example in homogeneous marine soft clay layer was established by numerical calculation. The bearing capacity and deformation characteristics of the single pile were studied. The results show that the horizontal force exerts no influence on the vertical bearing capacity of single pile when the applied horizontal force does not exceed the critical load. When the applied horizontal force exceeds the critical load,the horizontal force exerts a negative effect on the vertical bearing capacity of the single pile. The application of horizontal force postpones the occurrence of the failure point of vertical uplift bearing capacity,and with the increase of the applied horizontal force,the failure point of the uplift limit appears later. The application of horizontal force increases the uplift bearing capacity of single pile. The horizontal displacement produced by the horizontal force will be reduced and the horizontal bearing capacity of the single pile is increased by applying the vertical force in advance,and there is an optimal vertical load,which makes the horizontal displacement of the pile top minimum and the pile bending moment minimum.
In order to study the bearing behavior of single pile foundation under horizontal vertical coupling load,the calculation model of single pile based on the engineering example in homogeneous marine soft clay layer was established by numerical calculation. The bearing capacity and deformation characteristics of the single pile were studied. The results show that the horizontal force exerts no influence on the vertical bearing capacity of single pile when the applied horizontal force does not exceed the critical load. When the applied horizontal force exceeds the critical load,the horizontal force exerts a negative effect on the vertical bearing capacity of the single pile. The application of horizontal force postpones the occurrence of the failure point of vertical uplift bearing capacity,and with the increase of the applied horizontal force,the failure point of the uplift limit appears later. The application of horizontal force increases the uplift bearing capacity of single pile. The horizontal displacement produced by the horizontal force will be reduced and the horizontal bearing capacity of the single pile is increased by applying the vertical force in advance,and there is an optimal vertical load,which makes the horizontal displacement of the pile top minimum and the pile bending moment minimum.
引文
1刘红军,王永玮,王建收.既有竖向荷载对单桩水平承载特性影响的研究进展[J].中国海洋大学学报(自然科学版),2017,47(8):119-125Liu Hongjun,Wang Yongwei,Wang Jianshou.Recent advance of existing vertical load’s effect on horizontal bearing capacity of single pile[J].Periodical of Ocean University of China(Natural Science Edition),2017,47(8):119-125
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4文松霖.铅直、水平荷载作用下扩底桩的承载机理[J].长江科学院院报,2004,21(5):24-27Wen Songlin.Resistance behaviors of pile with enlarged base under axial and lateral loads[J].Journal of Yangtze River Scientific Research Institute,2004,21(5):24-27
5 Trochanis A M,Bielak J,Christiano P.Three-di-mensional nonlinear study of piles[J].Journal of Geotechnical Engineering,ASCE,1991,117(3):429-447
6赵明华,李微哲,杨明辉,等.成层地基中倾斜偏心荷载下基桩位移特性室内模型试验研究[J].土木工程学报,2006,39(12):95-99Zhao Minghua,Li Weizhe,Yang Minghui,et al.A model test study on displacement of piles under inclined and eccentric loads in layered soils[J].China Civil Engineering Journal,2006,39(12):95-99
7冯震,王连俊,许兆义.CFG桩竖向荷载作用下水平位移和弯矩的试验研究[J].土木工程学报,2005,38(2):95-99Feng Zhen,Wang Lianjun,Xu Zhaoyi.Experimental study on horizontal displacement and bending moment of CFG pile under vertical load[J].China Civil Engineering Journal,2005,38(2):95-99
8李尚飞.组合荷载作用下单桩的承载特性研究[D].上海:同济大学,2010Li Shangfei.Research on bearing character of single pile under combined load[D].Shanghai:Tongji University,2010
9郑刚,王丽.竖向及水平荷载加载水平、顺序对基桩承载力的影响[J].岩土工程学报,2008,30(12):1796-1804Zheng Gang,Wang Li.Effect of loading level and sequence of vertical and lateral load on bearing capacity of single pile[J].Chinese Journal of Geotechnical Engineering,2008,30(12):1796-1804
10丁勇春.软土地区深基坑施工引起的变形及控制研究[D].上海:上海交通大学,2009Ding Yongchun.Excavation-induced deformation and control in soft deposits[D].Shanghai:Shanghai Jiaotong University,2009
11陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].2版.北京:中国水利水电出版社,2013:95-97Chen Yumin,Xu Dingping.Fundamentals of FLAC/FLAC3D with engineering examples[M].2rd ed.Beijing:China Water Power Press,2013:95-97
12王志亮,宋茂天,殷宗泽.路堤计算中邓肯-张模型参数灵敏度分析[J].岩土力学,2004,25(7):1135-1138Wang Zhiliang,Song Maotian,Yin Zongze.Analyses of parameters sensitivity of Duncan-Zhang model in settlement calculation of embankment[J].Rock and Soil Mechanics,2004,25(7):1135-1138
13张云.修正剑桥模型参数对计算结果的影响[J].岩土力学,2006,27(3):103-106Zhang Yun.Effects of parameters of modified Cambridge model on computed results[J].Rock and Soil Mechanics,2006,27(3):103-106
14中国建筑科学研究院.建筑桩基检测技术规范:JGJ 106-2014[S].北京:中国建筑工业出版社,2014China Academy of Building Research.Technical code for testing of building foundation piles:JGJ 106-2014[S].Beijing:China Construction Industry Press,2014
2胡人礼.桥梁桩基础分析和设计[M].北京:中国铁道出版社,1987Hu Renli.Analysis and design of bridge pile foundation[M].Beijing:Chinese Railway Press,1987
3皇甫明,王幼青,张军.纵横向荷载作用下桩的工作性状研究[J].哈尔滨工业大学学报,2003,35(6):743-746Huang Fuming,Wang Youqing,Zhang Jun.Behavior of pile under combined axial and lateral loading[J].Journal of Harbin Institute of Technology,2003,35(6):743-746
4文松霖.铅直、水平荷载作用下扩底桩的承载机理[J].长江科学院院报,2004,21(5):24-27Wen Songlin.Resistance behaviors of pile with enlarged base under axial and lateral loads[J].Journal of Yangtze River Scientific Research Institute,2004,21(5):24-27
5 Trochanis A M,Bielak J,Christiano P.Three-di-mensional nonlinear study of piles[J].Journal of Geotechnical Engineering,ASCE,1991,117(3):429-447
6赵明华,李微哲,杨明辉,等.成层地基中倾斜偏心荷载下基桩位移特性室内模型试验研究[J].土木工程学报,2006,39(12):95-99Zhao Minghua,Li Weizhe,Yang Minghui,et al.A model test study on displacement of piles under inclined and eccentric loads in layered soils[J].China Civil Engineering Journal,2006,39(12):95-99
7冯震,王连俊,许兆义.CFG桩竖向荷载作用下水平位移和弯矩的试验研究[J].土木工程学报,2005,38(2):95-99Feng Zhen,Wang Lianjun,Xu Zhaoyi.Experimental study on horizontal displacement and bending moment of CFG pile under vertical load[J].China Civil Engineering Journal,2005,38(2):95-99
8李尚飞.组合荷载作用下单桩的承载特性研究[D].上海:同济大学,2010Li Shangfei.Research on bearing character of single pile under combined load[D].Shanghai:Tongji University,2010
9郑刚,王丽.竖向及水平荷载加载水平、顺序对基桩承载力的影响[J].岩土工程学报,2008,30(12):1796-1804Zheng Gang,Wang Li.Effect of loading level and sequence of vertical and lateral load on bearing capacity of single pile[J].Chinese Journal of Geotechnical Engineering,2008,30(12):1796-1804
10丁勇春.软土地区深基坑施工引起的变形及控制研究[D].上海:上海交通大学,2009Ding Yongchun.Excavation-induced deformation and control in soft deposits[D].Shanghai:Shanghai Jiaotong University,2009
11陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].2版.北京:中国水利水电出版社,2013:95-97Chen Yumin,Xu Dingping.Fundamentals of FLAC/FLAC3D with engineering examples[M].2rd ed.Beijing:China Water Power Press,2013:95-97
12王志亮,宋茂天,殷宗泽.路堤计算中邓肯-张模型参数灵敏度分析[J].岩土力学,2004,25(7):1135-1138Wang Zhiliang,Song Maotian,Yin Zongze.Analyses of parameters sensitivity of Duncan-Zhang model in settlement calculation of embankment[J].Rock and Soil Mechanics,2004,25(7):1135-1138
13张云.修正剑桥模型参数对计算结果的影响[J].岩土力学,2006,27(3):103-106Zhang Yun.Effects of parameters of modified Cambridge model on computed results[J].Rock and Soil Mechanics,2006,27(3):103-106
14中国建筑科学研究院.建筑桩基检测技术规范:JGJ 106-2014[S].北京:中国建筑工业出版社,2014China Academy of Building Research.Technical code for testing of building foundation piles:JGJ 106-2014[S].Beijing:China Construction Industry Press,2014