Comparison on load-bearing characteristics among equal diameter pile, belled pile and branch pile(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年05期
- Page:
- 37-44
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Comparison on load-bearing characteristics among equal diameter pile, belled pile and branch pile
- Author(s):
- ZHANG Li-peng; WANG Xiao-mou
- School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China
- Keywords:
- geotechnical engineering; equal diameter pile; belled pile; branch pile; load transfer; ultimate bearing capacity
- PACS:
- TU473.11
- DOI:
- -
- Abstract:
- The load transfer mechanisms of different types of pile foundation under upper load are different, that is, the bearing characteristics of pile foundation with different types are different. Under the current construction conditions, the choice of pile type is diverse. In order to investigate the bearing characteristics and the differences among different types of pile foundation in practical engineering, a reasonable choice of pile type was made under different stratigraphic conditions. Based on the results of field static load test on mandigged hole equal diameter pile in the same site, belled pile and branch pile, an comparative analysis of the characteristics of pile axial force, pile lateral friction, pile tip resistance, ultimate bearing capacity and pile settlement of the above three types of piles were conducted combining with experimental results. Moreover, the potential reasons for different characteristics were analyzed. Based on hyperbolic fitting method, the ultimate bearing capacities of the three types of pile foundations were analyzed. The results show that the bearing capacity of belled pile is the largest, the branch pile takes the second place, and the equal diameter pile is the least. Under the same load, the settlement of belled pile is the smallest, and then the branch pile follows, and the equal diameter pile is the maximum. In addition, the bearing load effect of the two branches of the branch pile is significant and shows significant time sequence. The pile axial force and lateral friction change greatly at the place of branch. The axial force and pile lateral friction resistance of the rest segments are similar to those of the diameter pile. The upper branch shares more load than the lower branch, which shows the characteristics of more friction pivot endbearing pile. And also the belled influence on the end of belled pile is significant, tip resistance of belled pile is larger than those of the equal diameter pile and branch pile, and the lateral friction of upper belled side drops to 0 suddenly and lower belled side gradually recovers with the increasing load, which shows the characteristics of endbearing pile. The experimental results can be used to select the type of pile in similar geological conditions.
Last Update: 2016-10-06