大直径钻埋预应力混凝土空心桩承载力的试验  

Simulation test of large-diameter bored hollow pile of prestressing force concrete

作　　者：冯忠居[1] 谢永利[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2005年第2期50-54,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：陕西省交通科技项目(9922G)

摘　　要：通过室内模拟试验,对大直径钻埋预应力空心桩承载力的桩侧阻力和桩端阻力分别进行模拟研究。分析桩周注浆体与桩体间的摩阻力以及注浆体与土体间的摩阻力,并与桩和土体界面的摩阻力试验结果相比较;研究桩端注浆前后承载力大小及其变化规律。研究结果表明:桩周压浆介质的差异对桩承载力性状影响很大,以填石压浆效果最好;同时压浆填料中含泥量宜控制在5%以内。此研究成果为完善大直径钻埋预应力混凝土空心桩设计与计算理论奠定基础。Through indoor simulation test, the paper conducts simulation to lateral friction and end friction of bearing capacity in large-diameter bored hollow pile of prestressing force concrete, and analyzes the friction between injecting cement paste around pile and pile as well as the friction between injecting cement paste and earth, and it also compares the experimental result of friction between pile and earth; besides, the paper studies the bearing capacity and its changing regularity before and after injecting cement paste at pile end. The results show that the mediums of injecting cement paste around pile have great inflence to the characters of pile’s carring capacity. The best effect can be achieved by rockfill and injecting cement. In practice, the silt content in the filling should be less than 5%.

关 键 词：桥梁工程 大直径空心桩 模拟试验 桩周压浆 桩侧阻力 桩端阻力 

分 类 号：U443.157[建筑科学—桥梁与隧道工程]