预应力薄壁管桩群桩施工引起的超静孔隙水压力试验研究  

TESTS ON EXCESS PORE WATER PRESSURE INDUCED BY DRIVING GROUP PRESTRESSED TUBULAR CONCRETE PILES

作　　者：余闯[1] 杜广印[2] 刘松玉[2] 

机构地区：[1]温州大学建筑与土木工程学院,浙江温州325005 [2]东南大学岩土工程研究所,南京210096

出　　处：《工业建筑》2009年第8期69-71,100,共4页Industrial Construction

基　　金：浙江省钱江人才计划资助项目;住房和城乡建设部科技计划项目(2008-K2-11)

摘　　要：海相软土中预应力薄壁管桩采用锤击法施工会产生较大的超孔隙水压力。通过某工程实测表明：群桩施工引起的孔压在初期消散较快，其后逐渐缓慢；引起的最大孔压接近于80kPa。在群桩施工结束的1个多月后，桩间土超静孔隙水压力尚未能彻底消散，剩余的最大超静孔隙水压力还有10-20kPa。群桩的施工导致孔压的叠加，对孔隙水压力的大小产生显著的影响。因此，必须采取合理的施工工艺，来控制孔隙水压力并加快孔隙水压力的消散，以使群桩施工能顺利的进行。In marine soft ground, the prestressed tubular concrete pile （PTC Pile） driven by hammering method induces the increase in excess pore water pressure （EPWP）. The following results are obtained by field test. The excess pore water pressure increases with time during pile installation and dissipates with time after installation. The maximum EPWP reaches as high as 80 kPa. The dissipation time of excess pore pressure varies with the time and the distance from the pile. As 1 month elapsed after installation, the residual EPWP remains still with the value in the range of 10 to 20 kPa. The accumulations of EPWP in group piles driving cause the high level stress in the ground. Therefore, the rational measures for controlling the excess pore water pressure pile installation should be taken during installation of group piles.

关 键 词：超静孔隙水压力 预应力薄壁管桩 海相软土 

分 类 号：U416.1[交通运输工程—道路与铁道工程]