CFG桩和树根桩单桩承载力现场试验研究  

Field tests on bearing capacities of CFG pile and root pile

作　　者：王年香[1,2] 周春儿 吴加武 任国峰 WANG Nian-xiang;ZHOU Chun-er;WU Jia-wu;REN Guo-feng(Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing 210029,China;Guangdong Province Planning and Design Institute for Water Transpotation Co.LTD,Guangzhou 510050,China)

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024 [2]水文水资源与水利工程国家重点实验室,江苏南京210029 [3]广东省航运规划设计院有限公司,广东广州510050

出　　处：《岩土工程学报》2022年第S02期194-197,共4页Chinese Journal of Geotechnical Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(Y321006,Y321007)

摘　　要：某码头堆场软土地基发生了推移,针对不同区域,分别采用CFG桩和树根桩桩网复合地基进行加固。通过CFG桩和树根桩单桩的现场静载试验,研究了CFG桩和树根桩单桩承载性状,对比了两者单桩竖向极限承载力试验结果,分析了CFG桩和树根桩单桩承载变形差异。结果表明,CFG桩和树根桩单桩静荷载试验Q-s曲线存在明显拐点,树根桩单桩竖向极限承载力要高于CFG桩,极限承载力下树根桩的单桩刚度明显高于CFG桩,最大荷载下桩顶最大沉降明显小于CFG桩。For the soft soil foundation slipped in the storage yard of a wharf,the composite foundations with CFG pile and root pile net are used for reinforcement in different zones.The field static load tests are carried out to study the bearing behavior of the CFG pile and root pile.The test results of their vertical ultimate bearing capacities of single pile are compared.The bearing deformation difference between the CFG pile and the root pile is analyzed.The results show that there are obvious inflection points in the Q-s curves of the static load tests on the CFG pile and root pile.The values of the vertical ultimate bearing capacity of the root pile are larger than those of the CFG pile.The stiffness of single pile of the root pile is significantly larger than that of the CFG pile under the ultimate bearing capacity,and its maximum settlement at pile top is obviously smaller than that of the CFG pile under the maximum loads.

关 键 词：CFG桩 树根桩 承载性状 变形差异 现场静载试验 

分 类 号：TU470[建筑科学—结构工程]