水平荷载作用下预应力高强度混凝土(PHC)管桩承载特性研究  

Study on load bearing characteristics of prestressed high-strength concrete(PHC)pipe piles under horizontal load

作　　者：贾鹏 刘亮 杨燕[1] 李闯[1] 李伟瀚 秋仁东 JIA Peng;LIU Liang;YANG Yan;LI Chuang;LI Weihan;QIU Rendong(China Railway Southwest Research Institute Co.,Ltd.,Chengdu 611731,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中铁西南科学研究院有限公司,四川成都611731 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《四川建筑科学研究》2025年第1期73-81,共9页Sichuan Building Science

摘　　要：预应力高强度混凝土(prestressed high-strength concrete,PHC)管桩是软土地区常用的一种桩型,其在水平荷载作用下的承载性能受多种因素的影响。为探究不同施工工艺、不同桩型以及不同桩顶土层抗力对其承载性能的影响程度,对某场地锤击、静压2种不同施工工艺下的3种桩型、2种桩径的16根PHC管桩进行了原位水平荷载试验,并采用有限元法对带承台以及桩顶有薄壳层2种工况下PHC管桩水平承载特性进行了补充数值模拟分析。结果表明:锤击、静压不同施工工艺以及桩型对试验桩水平承载力的影响不明显,同一桩径下不同桩型的试验桩的水平承载特性也基本相同。采用规范m(m为桩侧地基土水平抗力系数)法得到的桩身弯矩要比实测桩身弯矩稍小,但误差不大,表明目前桩基规范推荐的计算方法同样适用于水平荷载作用下PHC管桩桩身内力的计算。桩顶存在承台或者硬薄壳土层可有效提高桩身的水平极限承载力。Prestressed high-strength concrete(PHC)pipe pile is a common type of pile in soft soil area,and its bearing performance under horizontal loads is influenced by various factors.In order to explore the influence of different construction techniques,pile types,and soil resistance at the top of piles on their bearing performance,sixteen PHC pipe piles with three pile types and two pile diameters under two different construction techniques of hammering and static pressure were tested under in-situ horizontal load,and the finite element method was used to supplement the numerical simulation analysis of the horizontal bearing characteristics of PHC pipe piles under two working conditions:With a bearing platform and a thin shell layer on the pile top.The results show that the influence of hammering,static pressure and pile type on the horizontal bearing capacity of test piles is not obvious,and the horizontal bearing characteristics of test piles with different pile types under the same pile diameter are basically the same.The distribution of bending moment of pile body calculated by the gauge m(m is the horizontal resistance coefficient of pile side foundation soil)method is basically consistent with the measured results,and its value is slightly smaller than the measured value,this indicates that the calculation method recommended by the current pile foundation standards is also applicable to the calculation of internal forces of PHC pipe piles under horizontal loads.The horizontal ultimate bearing capacity of the pile body can be effectively improved on the presence of a pile cap or hard shell soil layer at the top of the pile.

关 键 词：PHC管桩 水平荷载试验 水平承载特性 施工工艺 桩型 有限元方法 

分 类 号：TU473.1[建筑科学—结构工程]