基于CPT数据确定伊拉克南部CFA桩承载力计算方法及数值模拟分析研究  

Research on calculation method for bearing capacity of CFA piles based on CPT data and numerical simulation analysis in Southern Iraq

作　　者：李东 钱明 张志豪 

机构地区：[1]青岛中油岩土工程有限公司,山东青岛266071

出　　处：《工程勘察》2018年第3期6-11,40,共7页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(41572247);中国石油工程建设公司科学研究与技术开发项目(CPECC2014KJ03)

摘　　要：本文研究主要针对伊拉克南部两河流域典型表层软土地区长螺旋钻孔灌注桩(CFA)。结合伊拉克南部某工程岩土工程勘察与长螺旋钻孔灌注桩单桩检测数据,筛选了6种国外比较常用的基于CPT数据计算桩基承载力的方法。首先,运用各方法,结合实测静力触探(CPT)数据计算单桩承载力,对计算结果进行初步对比分析;其次,结合单桩静载试验承载力值与各方法计算值进行对比分析;最后,应用Plaxis 3D三维有限元模型分别对桩端、桩侧及砂—粘土界面处桩的受力特性进行模拟分析,并与各计算值进行对比。经过以上分析,验证了LCPC法计算结果与实际情况比较一致,其准确性与精度满足工程设计要求,可作为该地区CFA桩基设计与施工的可靠依据。The research mainly focuses on the continuous flight auger（ CFA） piles in the marsh soft soil region of Mesopotamia in Southern Iraq. Combined the geotechnical investigation and the CFA pile testing data of practical engineering project in Southern Iraq,six calculation methods abroad for the calculation of pile bearing capacity based on CPT data are selected. Firstly,through the said methods the bearing capacity of piles based on the CPT data is calculated. Secondly,the results from the loading tests and the calculation methods are compared and analyzed. Finally,by using the Plaxis 3 D element model the simulating analysis on the stress conditions at the pile tip,the pile shaft and the sand-clay interface are carried out. After the multi-level argumentation,the calculation results and loading process from LCPC method is consistent with the practical engineering condition,and the accuracy could meet the requirement of engineering practice,and could be used as the basis for CFA pile design and construction in the area.

关 键 词：长螺旋钻孔灌注桩(CFA) CPT PLAXIS 3D 单桩静载试验 承载力 

分 类 号：TU473.1[建筑科学—结构工程]