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| RESEARCH ON TIME-EFFECT OF SHAFT BEARING CAPACITY OF JACKED-IN SINGLE PILE IN SOFT SOIL BASED ON SEISMIC PIEZOCONE PENETRATION TESTS(SCPTU) |
| CAO Quan1，2，3，SHI Jianyong1，2，LEI Guohui1，2，AI Yingbo1，2，CHEN Hong3 |
| (1. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；3. Shenzhen Municipal Design and Research Institute Co.，Ltd.，Shenzhen，Guangdong 518029，China) |
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Abstract According to the characteristics of installation about the seismic piezocone penetration tests(SCPTU) penetrometer and the pile，a theoretical relationship between time-effect of shaft bearing capacity of single pile and the data measured from SCPTU is developed，which can be used to predict the variation of shaft bearing capacity of a jacked-in pile with time in saturated soft clay. Different from the traditional way，the effect of different stiffness index and consolidation coefficient on the consolidation process in varied clays and highly stratified deposits are considered in the new theoretical solution. Besides，the ration of the solution is verified by the single pile loading tests in different time period after installation.
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Received: 30 December 2010
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| [1] BUSTAMANTE M，GIANESELLI L. Pile bearing capacity prediction by means of static penetrometer[C]// Proceedings of European Symposium on Penetration Testing. Amsterdam，The Netherlands：[s.n.]，1982：493–500.
[2] CUDMANI R，OSINOV V A. The cavity expansion problem for the interpretation of cone penetration and pressuremeter tests[J]. Canadian Geotechnical Journal，2001，38(6)：622–638.
[3] WHITE D J. Field measurements of CPT and pile base resistance in sand[R]. Cambridge，England：Cambridge University，2003.
[4] GUI M W，BOLTON M D. Geometry and scale effects in CPT and pile design[C]// Proceeding of the 1st International Conference of Site Characterization. Atlanta：[s.n.]，1998：1 063–1 068.
[5] ROY M，TREMBLAY M，TAVENAS F，et al. Development of pore pressures in quasi-static penetration tests in sensitive clay[J]. Canadian Geotechnical Journal，1982，19(1)：124–138.
[6] 叶观宝，汤 竞，徐 超，等. 利用孔压静力触探试验估算沉桩过程中产生的超孔隙水压力[J]. 工程力学，2005，22(增1)：194–198.(YE Guanbao，TANG Jing，XU Chao，et al. Estimation of excess pore water pressure during pile installation by piezocone test[J]. Engineering Mechanics，2005，22(Supp.1)：194–198.(in Chinese))
[7] ABU-FARSAKH M Y，TITI H H. Assessment of direct cone penetration test methods for predicting the ultimate capacity of friction driven piles[J]. Journal of Geotechnical and Geoenvironmental Engineering，2004，130(9)：935–944.
[8] ESLAMI A，FELLENIUS B H. Pile capacity by direct CPT and CPTU methods applied to 102 case histories[J]. Canadian Geotechnical Journal，1997，34(6)：886–904.
[9] TAKESUE K，SASAO H，MATSUMOTO T. Correlation between ultimate pile skin friction and CPT data[C]// Geotechnical Site Characterization Proceedings ISC?98. Atlanta：[s.n.]，1998：1 177– 1 182.
[10] JARDINE R J，CHOW F C. New design methods for offshore piles[R]. London：Marine Technology Directorate，Ltd.，1996.
[11] BROWN R P. Predicting the ultimate axial resistance of single driven piles[Ph. D. Thesis]. Austin：University of Texas，2001.
[12] COOP M R. The axial capacity of driven piles in clay[Ph. D. Thesis][D]. Oxford，England：University of Oxford，1987.
[13] 曹 权. 基于孔压静力触探试验(SCPTU)研究软土中静压桩的承载力性状[博士学位论文][D]. 南京：河海大学，2010.(CAO Quan. Research on characteristics of jacked-in pile in soft soil based on seismic piezocone penetration test(SCPTU)[Ph. D. Thesis][D]. Nanjing：Hohai University，2010.(in Chinese)) |
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2011, Vol. 30 
