›› 2016, Vol. 37 ›› Issue (5): 1268-1280.doi: 10.16285/j.rsm.2016.05.008

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A study of the additional stress caused by the tip resistance of a Y-shape pile with considering abnormality effect

WANG Xin-quan1, ZHANG Qiang2, ZHANG Shi-min1, CUI Yun-liang1, ZHOU Xing-de3   

  1. 1. Department of Civil Engineering, Zhejiang University City College, Hangzhou, Zhejiang 310015, China; 2. College of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui 232000, China; 3. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2015-12-18 Online:2016-05-10 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Yong Foundation of China(51308497),the Science and Technology Project of Ministry of Housing and Urban-Rural Development of People’s Republic of China (2015-K3-020), and the Science and Technology Program of Zhejiang Provincial Communicational Transport Department (2014H34).

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Abstract: A Y-shape pile is a newly-developed abnormal pile with a reversed-arch surface. The tip resistance distribution along the pile bottom section is non-uniform. Although the calculated additional stresses, due to the assumed uniformly distributed tip resistance, is more close to the actual values compared to those due to the assumed concentrated tip resistance, the former still has some error. Based on the numerical simulation, the nonuniform distribution model of tip resistance for a Y-shape pile is developed, and used to calculate the additional stresses. By means of the integral function NIntegrate of Mathematica software and Geddes’s stress solution, the numerical calculation method is introduced to estimate the vertical additional stress coefficient at any point in foundation under the action of tip resistance of Y-shape pile with considering the effect of abnormality. Assuming the major factors as variables, including the outside circle radius R, template radian ?, open arc spacing s, and angle radian ?, the variation of additional stress is comparatively studied for two distribution patterns of tip resistance of the Y-section pile, i.e, the uniform distribution and the nonuniform distribution with considering abnormality effect, respectively, and the method for calculating the additional stress due to tip resistance is used for estimating the settlement with considering abnormality effect. Based on the field static load tests, it is found that the calculated settlements agree well with the measured results using the proposed method.

Key words: Y-shape pile, abnormality effect, tip resistance, nonuniform distribution, additional stress coefficient

CLC Number: 

  • TU 473

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