摘要
根据桩基现场原位试验,分析了钻孔灌注桩的桩基承载力的性状特征。试验结果表明:各截面的轴力随着荷载的增加而增加,而在同一级荷载下轴力沿桩的深度逐渐变减小,说明桩长是轴力衰减大小的主要因素之一;桩侧/桩端阻力随着荷载的增加而增加,桩侧摩阻力若同时发挥作用,其与一定深度范围有关,而与地层无关,地层仅是侧摩阻力大小的主控因素。在求得单桩承载力特征值时,将桩端阻力和侧摩阻力取相同的安全系数未反映桩基荷载传递的实际情况。同时从经济分析的角度进行试桩成果总结,以期达到节省投资、缩短计划工期的目的。
On the basis of the pile foundation of in-situ tests, the characters of pile bearing capacity of bored pile is analyzed. The test results show that the cross section of the axial force increases with the increase of load, and gradually decreases along the depth of the pile under the same load axial force of pile length, one of the main factors of axial force decreasing. Pile side/pile tip resistance increased with the increase of load, pile lateral friction at the same time plays a role associated with certain depth scope, and not with the strata. When calculating the characteristic value of single pile bearing capacity, pile tip resistance and lateral friction resist- ance adopt the same safety coefficient, but not reflect the actual situation of pile load transferring. Pile testing is summarized from the perspective of economic analysis to save the investment and shorten the schedule.
出处
《桂林理工大学学报》
CAS
北大核心
2013年第3期493-498,共6页
Journal of Guilin University of Technology
基金
中国石油工程建设公司科学研究与技术开发项目(CPECC2011KJ22)
关键词
钻孔灌注桩
承载力
原位试验
后注浆
bored pile
bearing capacity
in-situ test
lateral pile grouting
