›› 2009, Vol. 30 ›› Issue (9): 2643-2650.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of uplift capacity of long enlarged-base pile in soft soil ground

LI Jian-jun1, 2, HUANG Mao-song1, 3, WANG Wei-dong4, CHEN Zheng5   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai Jianke Project Management Co., Ltd., Shanghai 200032, China; 3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 4. East China Architectural Design & Research Institute, Shanghai 200002, China; 5. East China Electric Power Design Institute, Shanghai 200063, China
  • Received:2008-03-24 Online:2009-09-10 Published:2010-03-24

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Abstract:

Determination of ultimate uplift capacity for enlarged-base pile plays a dominant role in engineering design. Resorting to limit equilibrium method based on local cutting slippage surface, a new simple formula of uplift capacity of enlarged-base pile in soft clay is deduced. Calculated results by the proposed formula have a good accordance with field test data. Based on above analysis approach, range of enlarged base is gained combined with the in situ test and engineering example. Finally, the analysis approach is applied to long enlarged-base pile and some useful conclusions are drawn: Failure mechanism of enlarged-base pile embedded in soft clay can be interpreted rationally with local cutting slippage surface; Range of enlarged base is related to pile radii and embedded depth.

Key words: enlarged-base uplift pile, local cut slippage surface, limit equilibrium method, ultimate capacity

CLC Number: 

  • TU 473.1
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