DX桩承力盘抗拔阻力的分析与研究  

ANALYSIS AND RESEARCH OF TENSILE RESISTANCE FOR LOAD-CARRYING PLATE OF DX PILE

作　　者：李广信[1] 汤飞[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《工业建筑》2005年第6期52-55,60,共5页Industrial Construction

基　　金：国家自然科学基金资助项目 (批准号 :5 0 2 790 14 )。

摘　　要：DX单桩的抗拔阻力不但源于桩身的摩阻力,其承力盘(岔)的阻力也是不可忽视的部分。对于桩身的抗拔摩阻力的研究有不少成果,在有关规范中也规定了折减系数。而各种扩底桩和支盘(岔)桩的抗拔端阻力研究较少,也缺少必要的试验资料。提出和检验了几种抗拔端阻力的分析计算方法,并与竖向受压的端阻力进行比较,且分析了一些试验结果,以期探讨DX桩的承力盘的抗拔承载力的设计计算方法。研究表明,DX桩承力盘拉拔的破坏形式及端阻力与桩周土的性质有关,与承力盘的尺寸和埋深等因素有关;一般讲,它明显小于受压桩的端阻力,其折减系数约为0 .3～0 .4。The resistance of tension DX pile consists of the frictional resistance of pil e shaft and the resistance of load|carrying plate.In comparison with the friction al resistance in tension pile,the latter is studied very little both in theory and in experiment.Several calculation methods of tension resistance of the plate ar e proposed or identified.The compressive end resistance and tensile resistances of the plate are compared with each other.A few experimental results are analyze d on the basis of the above calculations.It is found that the failure mode and th e resistance of the plate of tension DX pile are related with soil property,the size and depth of the plate.Generally,tensile resistance of the plate is less th an compressive one considerably,and the reduction factor is about 0 3～0 4.

关 键 词：承力盘 DX桩 分析与研究 分析计算方法 设计计算方法 折减系数 端阻力 抗拔承载力 试验资料 试验结果 破坏形式 摩阻力 扩底桩 桩周土 桩身 单桩 支盘 受压 竖向 压桩 

分 类 号：TU473.11[建筑科学—结构工程]