柔性楔形桩复合地基承载特性试验研究  

Experimental Study on Bearing Behavior of Composite Foundation with Flexible Tapered Column

作　　者：汤磊华 何杰[1] 王亚涛[1] 高建喜[1] 王忍[1] 

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《湖南工业大学学报》2015年第4期20-25,共6页Journal of Hunan University of Technology

基　　金：国家自然科学基金资助项目(51108176);湖南省研究生科研创新基金资助项目(CX2014B425;CX2015B571)

摘　　要：为了研究夯实水泥土楔形桩复合地基在粉质黏土地基中的承载特性,对碎石垫层作用下,3组不同楔角的夯实水泥土楔形单桩复合地基和1组等直径单桩复合地基进行竖向静载对比试验。分析复合地基中桩顶沉降、桩周土沉降、桩-土平均沉降差随荷载变化的规律,以及桩的荷载传递规律。试验结果表明:在相同地质条件下,夯实水泥土楔形桩承载性状比等直径桩好,且能更好地调节桩土之间的沉降;此外,桩身轴力的分布与桩体的楔角有关,在合理楔角范围内,桩体分担基础上部的荷载随楔角的增大而增加;土体距离桩心一定范围内的沉降曲线呈"勺子"型趋势变化。For the study of bearing performance of composite foundation with rammed soil-cement piles in silty clay ground, conducted vertical static load contrast experiments under the action of the gravel cushion on three groups of composite foundation with single rammed soil-cement tapered pile of different wedge angle and a group of composite foundation with single rammed soil-cement cylindrical pile, respectively. Analyzed the variation law of pile top settlement,soil around pile settlement and average pile-soil settlement difference with load and the load transferring law of pile. The test results show： Under the same geological condition, the bearing behavior of rammed soil-cement tapered pile is better than that of cylindrical pile, and the tapered pile can better adjust the settlement between pile and soil, in addition the distribution of axial force is relative to the wedge angle of pile, and in rational wedge angle range, the pile sharing load of upper foundation increased with increment of wedge angle; In a certain scope of soil to pile core, the settlement curve appeared the varying tendency of ＂spoon＂ type.

关 键 词：楔形桩 合理楔角 桩身轴力 桩周土 柔性桩复合地基 沉降 

分 类 号：TU473.1[建筑科学—结构工程]