真空联合变堆载预压下竖井地基固结分析  

Consolidation analysis of vertical drain with vacuum and varying surcharge preloading

作　　者：郭彪[1,2] 张发春 房锐 李果 陈贺 

机构地区：[1]云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室,云南昆明650200 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《湖南科技大学学报（自然科学版）》2014年第2期52-56,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

摘　　要：为了得到真空联合变堆载预压下竖井地基沉降随时间的发展规律,考虑真空度沿竖井线性减小,堆载单级线性施加,还考虑了地基的径竖向渗流以及扰动区土体水平渗透系数呈抛物线变化,推导了真空联合变堆载预压下竖井地基固结度的一个解析解.并分析了地基固结性状.结果表明,荷载逐渐施加时,采用真空联合堆载预压比只采用堆载预压固结要快,真空度越大,沿深度衰减越慢,固结越快.在地基井径比和水平渗透系数与竖向渗透系数之比较小时,地基的竖向渗流对地基的固结度有较大的影响.In order to get the settlement development pattern of vertical sand foundation under vacuum-surcharge preloading,A analytical solution was obtained for the consolidation of vertical sand foundation,under vacuum preloading considering,the vacuum degree was linearly changed along the vertical drain depth,the loading was applied in a single-stage way,both horizontal and vertical drainage,and the parabolic distribution pattern of horizontal permeability coefficient of soil was considered.Furthermore,the consolidation behavior of vertical drain foundation was analyzed.The results show that the loading is applied gradually,the larger the vacuum is,the faster the consolidation is,the slower the reducing of vacuum is,the faster the consolidation. Ignoring the vertical flow within the soil will under-estimate the consolidation rate.Furthermore,the less the radius ratio is,and the less the ratio of horizontal permeability to vertical permeability is,the greater the under-estimated value is.

关 键 词：竖井地基 固结 真空联合堆载预压 渗透系数 

分 类 号：TU47[建筑科学—结构工程]