（1 成都理工大学环境与土木工程学院，成都 610059；2 温州大学建筑与土木工程学院，温州 325035； 3 东南大学岩土工程研究所，南京 210096）
［摘要］软土地基中预制桩施工往往会产生较大的孔隙水压力。分析了海相软土中预应力薄壁管桩采用锤击沉入法施工产生超孔隙水压力的变化规律。通过对单桩沉桩过程中孔隙水压力的观测，得出以下结论：单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上覆有效土压力的1.5倍。最后提出了控制和减小孔隙水压力的施工措施。
［关键词］孔隙水压力；预应力薄壁管桩；软土；消散
Field test on pore water pressure induced by PTC pile installation in soft ground
Du Guangyin1，3，Yu Chuang2，Liu Songyu3 (1 Environment and Civil Engineering College, Chengdu University of Technology, Chengdu 610059, China； 2 College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China； 3 Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China)
Abstract:Precast pile installation induces the excess pore water pressure in soft ground. The prestressed tubular concrete pile (PTC pile) installation using hammering method causes the increase in excess pore water pressure of surrounding clays in soft ground. The following results are obtained by filed test. The excess pore water pressure increases with time during pile installation and dissipates with time after installation. The dissipation time of excess pore pressure varies with the time and the distance from the pile. The dissipation rate initially is larger than later. The longer the dissipation time, the closer the distance is. And the maximum excess pore water pressure is nearly 1.5 times of the effective overburden stress in ground soils. In the end, the measure controlling the excess pore water pressure pile installation is presented.
Keywords:pore water pressure; PTC pile; soft ground; dissipation
*国家自然科学基金资助项目(40702047)。
作者简介：杜广印，博士研究生，副教授，Email:guangyin@seu.edu.cn。
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