Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (7): 2838-2846.doi: 10.16285/j.rsm.2018.0577

• Geotechnical Engineering • Previous Articles     Next Articles

Shear properties of pile-soil of three modes of bored piles in field tests

WU Shuang-shuang1, HU Xin-li1, GONG Hui2, ZHOU Chang1, XU Chu1, WANG Qiang1, YING Chun-ye1   

  1. 1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China; 2. Guizhou Bridge Construction Group Co., Ltd., Guiyang, Guizhou 550000, China
  • Received:2018-04-09 Online:2019-07-11 Published:2019-07-28
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41630643), the National Key Research and Development Program of China (2017YFC1501302) and the Fundamental Research Founds for Central Universities (CUGCJ1701).

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Abstract: The pile-soil shear modes have significant influences on the displacement of pile-soil shear and the development of pile side resistance. Field experiments and long-term monitoring were carried out to study shear properties of six bored piles under three modes: bearing pile type, uplift pile type and negative friction pile type. The curve of side resistance versus displacement was established by systematically analyzing the pile strain, displacement of the top pile, and pile-soil layered subsidence of different pile types. The established curve was further used to determine the displacement of pile-soil shear in different modes and the ultimate lateral resistance at different depths. According to the characteristics of the ultimate lateral resistance in different modes, its five influence factors were analyzed, including the relative motion direction of pile-soil, shearing boundary constraint, shear displacement, loading rate and shear duration. Meanwhile, we discussed the feasibility of using the in situ testing results of uplift pile to predict the ultimate lateral resistance of negative friction pile in the increasing stage. This study provides useful references for similar projects.

Key words: pile-soil shear modes, ultimate lateral resistance, field test, bored pile, negative friction pile, uplift pile

CLC Number: 

  • U 443.15+4
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