CFG桩复合地基静载试验及有限元模拟  

Static load tests and finite element simulation of CFG pile composite foundation

作　　者：傅少君[1] 谢作为 杨红成 罗滔 韩燕华 FU Shao-jun;XIE Zuo-wei;YANG Hong-cheng;LUO Tao;HAN Yan-hua(School of Civil Engineering, Wuhan University, Wuhan 430072, China;First Engineering Co. Ltd. , China Construction Third Bureau, Wuhan 430040, China;Shaanxi Key Laboratory of Safety and Durability of Concrete Structure, Xijing University, Xi’an 710123, China;School of Civil Engineering, Hubei Engineering University, Xiaogan 432000, China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]中建三局第一工程有限责任公司,武汉430040 [3]西京学院陕西省混凝土结构安全与耐久性重点实验室,西安710123 [4]湖北工程学院土木工程学院,湖北孝感432000

出　　处：《沈阳工业大学学报》2021年第6期698-702,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51879207);湖北省教育厅科学技术研究项目(B2018165).

摘　　要：为了将CFG桩应用于马尔代夫吹沙回填岛礁灰岩地基中,以胡鲁马累住宅项目为案例,在现场进行了单桩和复合地基承载力试验,利用ANSYS有限元软件对CFG桩复合地基的受力特性进行了数值模拟.结果表明:单桩和复合地基承载力特征值均满足设计要求;数值模拟得到了与现场静载试验一致的荷载沉降规律;随着外荷载增加,桩土分担的荷载比例逐渐增大,桩土应力比也随之快速增长,当上部荷载达到148 kPa时,桩土应力比达到12且趋于稳定.In order to apply the CFG pile to the reef limestone foundation of sand blowing backfill island in Maldives,the Hulu-Male residential project was taken as an example,and the bearing capacity tests for the single pile and composite foundation were carried out on the spot.The stress characteristics of CFG pile composite foundation were simulated with the ANSYS finite element software.The results show that the bearing capacity characteristic values of single pile and composite foundation meet the design requirements,and the load-settlement law in consistence with the on-the-spot static load tests was obtained by the numerical simulation.With the increase of external load,the load proportion shared by the pile and soil gradually increases,and the pile-soil stress ratio rapidly increases.When the upper load reaches 148 kPa,the pile-soil stress ratio reaches 12 and tends to be stable.

关 键 词：CFG桩 复合地基 吹沙回填岛 静载 沉降 有限元 桩土应力比 荷载分担比 

分 类 号：TU472[建筑科学—结构工程]