挤扩支盘桩承载力性状的现场试验研究  

Field tests on load transfer performances of squeezed branch piles

作　　者：陈飞[1] 吴开兴[1] 何书[1] 

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000

出　　处：《岩土工程学报》2013年第S2期990-993,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41063001);江西理工大学博士基金项目(22027)

摘　　要：通过挤扩支盘桩原位测试试验,对单桩静载试验和桩身轴力测试结果分析表明,挤扩支盘桩的荷载–沉降曲线为缓变型,根据桩身应力测试结果,加荷初期桩摩阻力发挥较多,加荷后期,摩阻力已发挥到极限,所加荷载主要由支盘承担,支盘承担的荷载超过总荷载的一半;挤扩支盘桩的支盘阻力主要体现端承力的性质,桩侧摩阻力和承力盘阻力的发挥具有明显的时序效应。试验研究成果为工程应用提供了有价值的参数和实验依据。在工程实例中,挤扩支盘桩比同径、同桩长的普通灌注桩提高单桩承载力89%,节省工程造价28%。Based on the field tests on squeezed branch piles and piles with equivalent diameter, the static load tests on single pile and the test results of pile body resistance are studied and analyzed. The study indicates that load-settlement curve of squeezed branch piles changes slowly, and the piles behave mechanical features of end-bearing pile under the action of vertical load. The nature of foundation soils, span and diameter of piles, diameter and amount of plates and vertical spacing between piles are the main factors to influence bearing capacity of squeezed branch piles. The tests and study results provide valuable parameters and experimental data for engineering application of squeezed branch piles. In the engineering case, compared with that of the traditional borehole piles, the bearing capacity of single squeezed branch pile is increased by 89%, and the construction cost is saved by 28%.

关 键 词：挤扩支盘桩 荷载传递特性 承载力 静载荷试验 

分 类 号：TU473.1[建筑科学—结构工程]