西南交通大学学报2017，Vol.52Issue(1)：30-37,8.DOI:10.3969/j.issn.0258-2724.2017.01.005
柔性荷载作用下桩筏加固地基变形特性试验研究
Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load
摘要
Abstract
To study the pile-raft foundation in thick soft clay ground,total settlements of foundation surface,layered settlements,lateral deformations,and pore water pressures of foundation soil for pile-raft foundation and natural foundation were observed and analyzed by long-time in-situ test.The load and deformation mechanism of pile-raft foundation under flexible load was proposed by the comparative analysis of the deformation differences between the two types of foundations.The results show that the total settlement of pile-raft foundation is reduced to be the 24％ total settlement of the natural foundation,and the differential settlement is reduce to be 0.9％.This means that the pile-raft foundation has lager integral rigidity,which can homogenize the load and restrict the lateral deformation,and lead to the reduction in the total settlement and differential settlement.The settlement of the pile-raft foundation in substratum is the main part of total settlement,which accounts for the 90％ total settlement.The pile-raft structure bears the most subgrade load.Compared with that of the natural foundation,the excess pore water pressure of the pile-raft foundation is reduced by about 70％;therefore,the settlement of foundation is reduced.关键词
柔性荷载/桩筏加固地基/原位长期试验/变形机理/超孔隙水压力Key words
flexible load/pile-raft foundation/long-time in-situ test/deformation mechanism/excess pore water pressure分类
交通工程引用本文复制引用
邵国霞,苏谦,陈尚勇,白皓,王武斌..柔性荷载作用下桩筏加固地基变形特性试验研究[J].西南交通大学学报,2017,52(1):30-37,8.基金项目
中央高校基本科研业务费专项资金资助项目(2682015CX008EM) （2682015CX008EM）
国家自然科学基金资助项目(51378441) （51378441）
