软粘土地基中挤土桩沉降时效性分析  

TIME-DEPENDENCY ANALYSIS OF SOIL COMPACTION PILE IN SOFT CLAY GROUND

作　　者：张雪松[1] 屠毓敏[1] 龚晓南[1] 潘巨忠 

机构地区：[1]浙江大学土木系,杭州310027 [2]浙江省火电建设公司,杭州310016

出　　处：《岩石力学与工程学报》2004年第19期3365-3369,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：位于饱和软粘土地基中的挤土桩,由于沉桩过程中地基土产生挤土效应及超静孔隙水压力,同时随着超静孔隙水压力的消散,桩周地基土产生再固结沉降。在研究沉桩过程中超静孔隙水压力的形成及消散规律的基础上,研究了桩周地基土再固结沉降的变化规律;从桩土相互作用的原理出发,研究了在桩周地基土再固结沉降的作用下,工程桩基沉降的计算方法。研究表明:由于桩周地基土的再固结沉降作用,工程桩基产生较大的沉降量,其值远大于垂直荷载作用下的桩基沉降;由于桩周地基土的再固结,桩基沉降随着时间的推移而增长。Because of soil squeezing effect and excess pore water pressur,reconsolidation settlement will occur around soil compaction piles in saturated soft clay during pile driving. The issue of reconsolidation settlement is analyzed in this paper with respect to the excess pore water pressure formation and dispersing scatter discipline. In addition,calculation methods of pile settlement due to soil reconsolidation settlement is studied by using the interaction effect principle. The research indicates that the pile settlement due to soil reconsolidation settlement is far more than that due to vertical load,and this kind of settlement will go up with time. Therefore,the time-dependency of pile settlement is theoretically studied.

关 键 词：土力学 挤土效应 超静孔隙水压力 再固结沉降 桩基沉降时效性 

分 类 号：TU473.1[建筑科学—结构工程]