饱和黏土中沉桩挤土形成超静孔压分布理论解答研究  

Theoretical solutions of distribution of excess pore pressure due to pile jacking in saturated clay

作　　者：高子坤[1,2] 施建勇[3] 

机构地区：[1]莆田学院土木建筑工程学系,福建莆田351100 [2]河海大学水利水电学院,江苏南京210098 [3]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《岩土工程学报》2013年第6期1109-1114,共6页Chinese Journal of Geotechnical Engineering

基　　金：福建省教育厅A类项目(JA12295)

摘　　要：饱和黏土中沉桩挤土会形成较大的超静孔隙水压力,其时间及空间分布相关特性影响场地土体工程性质和土木及水利工程设计施工的技术经济的合理性。为得到沉桩挤土形成的超静孔压分布理论解答,首先根据三维挤土附加总应力解答分析成桩后挤土造成的超静孔隙水压力分布规律,结合附加总应力计算方法,采用Henkel公式推导三维挤土造成的超静孔隙水压力理论解答;然后,结合工程实例,应用三维固结计算级数解,对沉桩挤土的位移、应力、超静孔隙压力分布规律和成桩后孔压消散的完整过程进行较为系统地计算和验证,为桩基工程的设计和施工提供理论依据和计算方法。Pile jacking will produce excess pore water pressure in saturated clay and affects technical and economic rationality of design and construction in civil and hydraulic engineering in time and space. In order to obtain theoretical solution of distribution of excess pore pressure due to pile jacking in saturated clay, the distribution rules of pore water pressure are analyzed, and the Henkel formula is used to calculate the excess pore water pressure caused by 3D soil squeeze based on calculated results of the additional total stress. Finally, based on the engineering practice, the distribution rules of displacement and stress and excess hydrostatic pore pressure are calculated for test and verification of theoretical solutions by means of the consolidation series solution. It may provide methods for design and construction of pile foundation engineering.

关 键 词：沉桩挤土 附加应力 Henkel公式 超静孔隙水压力 固结级数解 

分 类 号：TU47[建筑科学—结构工程]