初始含水率对吹填土地基真空预压加固效果影响分析  

Analysis of influence of initial water content on result of vacuum preloading method to improve hydraulic fill foundation

作　　者：刘敏 冯海暴 赵莎莎 张嘉莹 LIU Min;FENG Hai-bao;ZHAO Sha-sha;ZHANG Jia-ying(School of Civil Engineering,Hebei University of Engineering,HanDan,HeBei 056038,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China;Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]中交第一航务工程局有限公司,天津300461 [3]中交天津港湾工程研究院有限公司,天津300222

出　　处：《中国港湾建设》2023年第8期78-82,共5页China Harbour Engineering

摘　　要：为研究不同初始含水率下沉降变化规律,以软土地基处理工程为例,采用有限元数值分析方法模拟真空预压作用下欠固结土的沉降变形,得到在真空预压作用下土体沉降变形以及孔压消散的过程。通过数值模拟分别对5种不同初始含水率的欠固结土进行沉降分析,结果表明:初始含水率小的土体趋于稳定时间较快且沉降量较小,随着初始含水率的增大,土体趋于稳定的时间较长且沉降量逐渐增大,采用最小二乘法分析最终沉降量与初始含水率的关系得到最优拟合方式为线性拟合以及对应的拟合公式为s=22.95w_(0)-1101.6。In order to study the law of change of settlement of soil with different initial water content,taking a soft soil improvement project as an example,the finite element numerical analysis method was used to simulate the settlement deformation of under-consolidated soil under vacuum preloading,and the process of soil settlement deformation and pore pressure dissipation under vacuum preloading was obtained.Through numerical simulation,a settlement analysis was carried out on five kinds of under-consolidated soil with different initial water content,and the results show that:soil mass with a small initial water content tends to stabilize with shorter time and the settlement is smaller and,with the increase of the initial water content,the soil takes a longer time to stabilize and the settlement becomes gradually larger.The least square method was used to analyze the relationship between the final settlement and the initial water content,and the optimal fitting method obtained is the linear fitting while the corresponding fitting formula is s=22.95w0-1101.6.

关 键 词：真空预压法 吹填土 初始含水率 沉降 

分 类 号：U655.544.4[交通运输工程—港口、海岸及近海工程]