双荷载箱技术深长嵌岩桩基承载特性试验研究  

Experimental study on bearing characteristics of deep rock-socketed pile based on double load cell technology

作　　者：龚成中[1,2] 龚维明[1] 何春林[2] 戴国亮[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]淮阴工学院建筑工程学院,江苏淮安223001

出　　处：《岩土工程学报》2010年第S2期501-504,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家科技支撑计划课题项目(2008BAG07B01)

摘　　要：深长嵌岩桩是指嵌入岩层深度较大的桩,一般的试验方法难于准确测出嵌岩桩岩层的桩侧阻力和桩端阻力。双荷载箱技术根据不同的设计要求,将两个荷载箱埋置于桩身特定位置,按照不同的加载次序,可分别测出指定桩段的极限承载力,可解决部分传统试桩难以解决的问题。实测结果表明:该地区大直径深长嵌岩桩的桩顶的曲线主要是缓变型为主;从桩侧岩层摩阻力来看,勘探报告所提供的岩层极限侧阻力数值偏小;从桩侧、桩端阻力分布来看,在软岩地区嵌岩深度大小对承载力影响较大,嵌岩比越大,相应的承载力越大,变形越小。The deep rock-socketed pile is the pile which embedded in rock deeply.The side resistance and tip resistance of rock are difficult to be measured accurately with general test methods.According to different loading sequence,double load cell technique,with two load cells embedded in the specific position of the pile to meet different design needs,can measure the actual bearing capacity of specified pile section and solve some questions that conventional test ways can't.The results indicate that Q-s curve of large diameter and deep rock-socketed shaft in this area is slowly changed.From the view of side resistance,the value of ultimate side resistance which provided by exploration report is less than the true one.With the point of distribution of side and tip resistance,the length which is embedded in sock has great impact on the bearing capacity in the soft rock area.As the embedded ratio is greater,the resistance is greater,and the deformation is smaller.

关 键 词：桥梁工程 深长嵌岩桩 自平衡法 双荷载箱 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]