›› 2015, Vol. 36 ›› Issue (11): 3150-3156.doi: 10.16285/j.rsm.2015.11.015

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental research on horizontal bearing behavior of caisson-pile composite foundation

WANG Lei1, 2, GUO Chao3, MU Bao-gang1, 2, GONG Wei-ming1, 2, SUN Zhen-wei4   

  1. 1. School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China; 2. Key Laboratory for RC and PRC Structure of Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China; 3. China Communication Highway Planning and Design Institute, Beijing 100088, China; 4. China Shanghai architectural design & research institute, Shanghai 200063, China
  • Received:2015-04-30 Online:2015-11-11 Published:2018-06-14
  • Supported by:

    Project supported by the National Key Basic Research Program of China (Grant No.2013CB036304) and the Special Project of Important Science and Technology of Transport of Ministry of Transport in Twelfth Five Year Plan Period (Grant No.2011318494160).

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Abstract: In this study, four groups of different types of bridge foundation model are tested to research the horizontal bearing behavior of caisson-pile composite foundation in lab based on the Qiongzhou Strait bridge project. The Q-s curve and horizontal ultimate bearing capacity of these four groups of foundations in sandy soil layer are obtained. Pile bending moment and shear force of pile shaft are analyzed in detail. At the same time, the load sharing ratio of caisson and piles is discussed. The results show that the horizontal ultimate bearing capacities of a single caisson foundation are increased by 1.2 times, 1.6 times and 2 times respectively with adding skirts, steel pipe pile, or steel pipe pile and the skirt. The maximum bending moment point is in the middle of the pile shaft, i.e. at about 0.5 m under the mud surface. The horizontal load is borne mainly by the upper caisson foundation and soil layers above the middle upper part of pile. The maximum shear force is found at the joint of pile top of steel pipe and caisson pile, where the reinforcement measures should be taken in practical engineering. The research achievements could provide a better reference for design or construction of caisson-pile composite foundation.

Key words: caisson-piles, composite foundation, horizontal bearing capacity, experimental research

CLC Number: 

  • TU 443
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