深厚软基区桥梁桩基竖向承载特性  

Vertical Bearing Feature of Bridge Pile Foundation in Deep Soft Foundation Area

作　　者：冯忠居[1] 李孝雄 苏航州 王富春[1] 王溪清[1] 建鑫龙 许万贵 叶方才 FENG Zhong-ju;LI Xiao-xiong;SU Hang-zhou;WANG Fu-chun;WANG Xi-qing;JIAN Xin-long;XU Wan-gui;YE Fang-cai(School of Highway,Chang an University,Xi an 710064,Shaanxi,China;School of Geographic Information and Tourism,Chuzhou University,Chuzhou 239000,Anhui,China;Northwest Engineering Co.,Ltd.of Power China,Xi an 710065,Shaanxi,China;Guangdong Dachao Expressway Co.,Ltd.,Guangzhou 514247, Guangdong,China;Ningbo Highway Municipal Design Co.,Ltd.,Ningbo 315100,Zhejiang,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]滁州学院地理信息与旅游学院,安徽滁州239000 [3]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [4]广东大潮高速公路有限公司,广东广州514247 [5]宁波公路市政设计有限公司,浙江宁波315100

出　　处：《筑路机械与施工机械化》2018年第10期53-59,共7页Road Machinery & Construction Mechanization

基　　金：宁波市交通运输科技与成果转化项目(201401)

摘　　要：为了探明深厚软基区桥梁桩基竖向承载特性,采用理论分析与数值仿真方法,建立了深厚软基区桥梁桩基础三维空间模型,分析了不同工况下桩基础的竖向极限承载力、桩端阻力及桩侧阻力的变化规律。研究结果表明:随着软土厚度的增大,桩基竖向极限承载力逐渐减小;当桩端位于非软土层时,随着软土厚度的增大,桩侧阻力减小显著,但桩端阻力无明显变化;当桩端位于软土层时,随着软土厚度的增大,桩端阻力与桩侧阻力均减小,桩侧阻力占极限承载力的比重逐渐增大;当桩基穿越软土层,且桩长大于40m、桩径大于1.2m时,表现出超长桩和大直径桩的特性。In order to explore the vertical bearing characteristics of bridge pile foundation in deep soft foundation area,the three-dimensional spatial model of bridge pile foundation in deep soft foundation area was established by means of theoretical analysis and numerical simulation method.The ultimately vertical bearing capacity of pile foundation and the variation of the pile tip resistance and the pile side resistance under different working conditions were analyzed.The results show that with the increase of the thickness of the soft soil,the ultimately vertical bearing capacity of pile foundation decreases gradually.When the pile tip is located in the non-soft soil layer,the pile side resistance decreases significantly with the increase of the soft soil thickness,but the pile tip resistance has no obvious change.When the pile tip is located in the soft soil layer,the pile tip resistance and the pile side resistance are both increased with the increasing of the soft soil thickness;When the pile tip is located in the soft soil layer,as the increasing of the thickness of the soft soil,the pile tip resistance and the pile side resistance decrease,while the proportion of the pile side resistance to the ultimate bearing capacity increases gradually;When the pile foundation passes through the soft soil layer,given that the pile length is greater than 40 m and the pile diameter is greater than 1.2 m,the characteristics of the super long pile and the large diameter pile will be exhibited.

关 键 词：桥梁桩基 深厚软土 竖向承载特性 极限承载力 

分 类 号：U446.3[建筑科学—桥梁与隧道工程]