摘要
为了解海陆交互相沉积土中预应力高强混凝土(PHC)管桩锤击沉桩产生的施工效应,在长江口北岸选择典型场地开展了一系列现场试验研究。结果表明,超静孔压大小、上升与消散速度受土层性质决定,沉桩引起的超静孔压沿深度增大程度软土层高于粉土、砂土层。沉桩结束30d后,25～40m长PHC管桩单桩极限承载力可提高约33.5%。施工结束后相同龄期时,桩体越长单桩极限承载力提高的百分比相对越小。锤击法施工时每米锤击数与按孔压静力触探(CPTU)测试所得管桩总贯入阻力间有很好的线性相关性。
To learn the installation effect of prestressed high-strength concrete （PHC） pipe pile with hammer-driving method in interactive marine and terrestrial deposit, typical test site was selected at the north bank of Yangtze River estu- ary and a series of field tests were conducted. The test results indicate that the magnitude, increase and dissipation of ex- cess pore pressure are determined by soil properties. The increase of excess pore pressure due to pile installation along depth in soft soil is higher than that in silty or sandy soil. About 33.5 ~ increase of the ultimate bearing capacity of single pile with length of 25440 m is achieved 30 days after pile installation. In addition, the longer the pile is, the relatively smaller the increasing ratio of the ultimate bearing capacity of single pile will have for the same period after pile installa- tion. Finally, the blow count per meter of hammer-driving along depth is in good linear correlation with the total pile pen- etration resistance obtained from CPTU test.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2013年第3期102-106,共5页
Journal of Wuhan University of Technology
基金
国家自然科学基金(41272311)
高等学校博士学科点专项科研基金(20100092120049)
江苏省交通科学研究计划(09Y33)
关键词
海陆交互相沉积土
PHC管桩
施工效应
超静孔隙水压力
贯入阻力
interactive marine and terrestrial deposit
prestressed high-strength concrete （PHC） pipe pile
instal lation effect
excess pore pressure
penetration resistance
