真空—堆载联合预压不排水桩复合地基固结简化解研究  

Study on Simplifying Solution to Consolidation of Composite Ground with Partially Penetrated Impervious Pile under Vacuum-surcharge Preloading

作　　者：张玉国[1] 张丹贝 黄彤[1] 万东阳 韩帅[1] 郑言林 

机构地区：[1]中原工学院,郑州450007

出　　处：《中原工学院学报》2017年第4期52-56,共5页Journal of Zhongyuan University of Technology

基　　金：国家自然科学基金项目(U1204511);河南省高等学校青年骨干教师资助计划项目(2013GGJS-118)

摘　　要：针对不排水桩复合地基固结问题,考虑到真空-堆载联合预压荷载的瞬时施加和桩体未打穿等因素对复合地基固结的影响,采用双层地基法将未打穿复合地基转化为等效双层地基,推导出真空-堆载联合预压不排水桩复合地基固结简化解,并绘制出贯入比、桩-土压缩模量之比、加固区和下卧层的土体渗透系数之比以及压缩模量之比对固结的影响曲线图。研究结果表明,在单面排水条件下,随着贯入比、桩-土压缩模量之比、加固区和下卧层土体压缩模量之比的增大,复合地基固结速率随之加快;加固区和下卧层的土体渗透系数之比对固结速率的影响不显著。在各种影响因素中,贯入比对固结速率的影响最大,加固区和下卧层土体压缩模量之比对固结速率的影响较为明显。Aiming to the consolidation of impervious pile composite ground which considering the effect of vacuum-surcharge preloading and pile partial penetration and other factors,the composite ground with partially penetrated piles is turned into an equivalent-double-layered ground by the method of double-layeredsoil;and the simplifying analytical solution to consolidation of composite ground with partially penetrated impervious pile under vacuum-surcharge preloading is derived,the results are prepared in graph forms which considering the influence of some factors including penetration ratio,pile-soil compression modulus ratio,ratio of permeability coefficient and compression modulus of reinforcement zone and substratum by programming and calculating.The research results show that,the consolidation rate is increased with the increase of penetration ratio,pilesoil compression modulus ratio,compression modulus ratio of reinforcement zone and substratum under singlesided drainage;the influence of soil permeability coefficient ratio of reinforcement zone and substratum on consolidation is not obvious;among the various influencing factors,the penetration ratio has the greatest influence on the consolidation rate,and the compression modulus ratio of reinforcement zone and substratum on the consolidation is more obvious.

关 键 词：固结 不排水桩 真空-堆载联合预压 未打穿 等效双层地基 

分 类 号：TU472[建筑科学—结构工程]