摘要
某码头堆场软土地基发生了推移,采用树根桩网复合地基进行加固。通过土工离心模型试验研究超大荷载下桩长对树根桩网复合地基沉降特性的影响,试验模拟了地基、树根桩、加筋垫层、防尘网和轨道梁基础、矿石堆载等,分析了超大荷载作用下不同桩长复合地基沉降变化规律。试验结果表明,复合地基表面沉降呈锅形分布,沉降随桩长的增加而减小,分布形状变尖,等长桩沉降远大于设计桩长,分布形状更尖。设计桩长桩网复合地基在350 kPa荷载作用下2 a责任期沉降满足控制在80 cm以内的使用要求,表明树根桩的布置方案合理、可行。
For the slip of the soft soil foundation in the storage yard of a wharf,the root pile-net composite foundation is used for reinforcement.The geotechnical centrifugal model tests are carried out to study the effects of pile length on settlement characteristics of the root pile-net composite foundation under super-large loads.The foundation,root piles,reinforced cushion,dust net foundation,track beam foundation and ore loads are simulated in the tests.The settlement variation laws of composite foundation with different pile lengths are analyzed the under super-large loads.The surface settlement of the composite foundation is distributed in a pan shape.The settlement decreases with the increase of the pile length,and the distribution shape becomes sharp.The settlement of the equal-length pile scheme is far greater than that of the design length pile scheme,and the distribution shape is sharper.The settlement of the pile-net composite foundation with the design pile length meets the use requirements of controlling within 80 cm under the loads of 350 kPa in two years.The test results show that the arrangement scheme of root piles is reasonable and feasible.
作者
董华钢
周春儿
王年香
徐光明
顾行文
任国峰
DONG Huagang;ZHOU Chuner;WANG Nianxiang;XU Guangming;GU Xingwen;REN Guofeng(Guangdong Province Planning&Design Institute for Water Transportation Co.,Ltd.,Guangzhou 510050,China;Department of Geotechnical Engineering,Nanjing Hydraulic Research Institute,Nanjing 210024,China;National Key Laboratory of Disaster Prevention Water,Nanjing Hydraulic Research Institute,Nanjing 210029,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第S01期201-205,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51179106)
关键词
树根桩网复合地基
沉降
桩长
超大荷载
离心模型试验
root pile-net composite foundation
settlement
pile length
super-large load
centrifugal model test
