封闭环境中群桩桩间土超孔压消散数值模拟  

Numerical simulation of dissipation of excess pore water pressure of squeezed soil among pile groups in enclosed fields

作　　者：高子坤[1] 何俊[2] 

机构地区：[1]莆田学院土木建筑系,福建莆田351100 [2]湖北工业大学土木与建筑工程学院,湖北武汉430068

出　　处：《河海大学学报（自然科学版）》2010年第3期290-294,共5页Journal of Hohai University(Natural Sciences)

基　　金：福建省教育厅A类项目(JA08198);福建省青年人才项目(2008F3094)

摘　　要：通过分析封闭环境中群桩基础成桩后,桩间土体及下卧土层中超静孔隙水压力消散的边界条件和初始条件,建立了场地边界径向渗流受到阻隔时,饱和黏土中群桩桩间横观各向同性土体固结的定解条件,应用数值理论建立了相应定解问题的有限元程序,对桩间及下卧土层中压桩挤土造成的孔压消散时空变化规律进行了模拟研究.结果表明:下卧土层的渗透特性对桩间土体的孔压消散有明显影响,特别当下卧土层水平向渗透系数很小时,桩间土超孔压消散将延续非常长的时间.The boundary and initial conditions for the dissipation of the excess pore water pressures of squeezed soil and in underlying soil strata among pile groups in enclosed fields were analyzed. The definite solution conditions for the consolidation of transversely isotropic soil among pile groups in saturated clay were established when the radial seepage at the site boundary was obstructed. The FEM procedures for the corresponding definite solutions were proposed based on numerical theories. The temporal and spatial variation of the dissipation of the excess pore water pressures of squeezed soil and in underlying soil strata among pile groups were studied. The results show that the dissipation of pore water pressure of soil among pile groups is greatly affected by the permeability of underlying soil strata. Especially when the horizontal permeability coefficient is relatively small,the dissipation of the excess pore water pressure of squeezed soil among pile groups has a long duration.

关 键 词：群桩 桩间土 封闭环境 孔压消散 数值模拟 时空变化 

分 类 号：TU473.12[建筑科学—结构工程]