大直径扩底嵌岩桩抗拔承载性状试验与分析  

Experimental Analysis and Numerical Calculation of Large Diameter Rock Socketed Uplift Pile with Belled Shaft

作　　者：刘波[1] 徐薇[1] 胡和涛 屈海波[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《安徽理工大学学报（自然科学版）》2015年第2期1-5,42,共6页Journal of Anhui University of Science and Technology:Natural Science

基　　金："十二五"国家科技支撑计划子课题资助项目(2012BAK24B0201)

摘　　要：为了了解大直径扩底嵌岩桩在高层建筑中的抗拔承载力及影响因素,以深圳某高度为660 m的超高层工程为背景,采用自平衡法对3根大直径扩底嵌岩抗拔桩进行加载试验。在试桩试验的基础上,建立了扩底抗拔嵌岩桩数值模型,并进行了三维有限差分数值计算及参数化分析,数值计算结果与试桩试验结果吻合较好,表明建立的模型可以较好的模拟大直径扩底嵌岩桩的抗拔工作特性。同时讨论并分析了大直径扩底嵌岩抗拔桩的桩身轴力、桩身等直径段和扩底处侧摩阻力的分布特征,研究了扩大头周围岩体弹性模量、扩径比和扩底高度对抗拔承载力的影响。结果表明,扩径比的增大对大直径嵌岩桩的抗拔承载力影响较大,扩大头周围岩体弹性模量和扩底高度的影响相对较小。For the purpose of studying the uplift 3 piles of self - balance loading tests was carried bearing capacity of large diameter drilled shaft with belled shaft, out. A series of 3 D numerical analyses were preformed based on the tests. The uplift load versus displacement curves are in a good agreement with selfbalance loading tests. The pile shaft force, side friction of straight shaft and the bell at the bottom and elastic - plastic deformation were discussed. Moreover, it is shown that increase of expansion ratio of diameter will increase uplift capacity accordingly. The elastic modulus of rock around pile and uplift capacity. enlarged base was not account as a factor of rock socketed pile

关 键 词：扩底桩 嵌岩桩 抗拔承载力 自平衡法 数值分析 

分 类 号：TU473.1[建筑科学—结构工程]