›› 2012, Vol. 33 ›› Issue (2): 389-394.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Model test of vertical bearing capacity of cast-in-situ X-shaped concrete piles

ZHANG Min-xia1, 2, 3, LIU Han-long1, 3, DING Xuan-ming1, 3, WANG Zhi-qiang1, 3   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. College of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China; 3.Geotechnical Research Institute, Hohai University, Nanjing 210098, China
  • Received:2010-06-19 Online:2012-02-10 Published:2012-02-14

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Abstract: To study the load settlement characteristics and load-transfer mechanism of cast-in-situ X-shaped concrete piles, full-scale model pile load test of X-shaped pile is carried out by using the large-scale test trench of Hohai University. The interaction behavior of the vertical loaded X-shaped piles is obtained by means of the reinforcement stress gauges set in the pile and earth-pressure boxes embedded in the pile bottom. The experiment results show that: X-shaped pile load settlement curve is an adjustment curve; pile side friction and tip resistance show incremental development with the increasing pile settlements; but with the increase of pile top load, the ratio of pile side resistance sharing pile head load is regressive, its sharing ratio decreases from the initial load of about 90% to 70% of the limit state, while the ratio of tip resistance sharing the load is incremental, the pile top load-sharing ratio of about 10% from the initial state up to 30% of the limit. The research results are useful for the design and analysis of X-shaped piles under vertical load.

Key words: cast-in-situ X-shaped pile, full-scale model test, bearing capacity, pile side friction resistance, pile tip resistance

CLC Number: 

  • TU 473.1
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