Laboratory-scale model studies on bearing characteristics of junked tires encased slags pile composite foundation

Abstract

Junked tires encased slags pile composite foundation (JTES pile composite foundation for short) is a new method for treating soft soil ground. To study the vertical load-settlement characteristics and load-transfer mechanism of JTES pile composite foundation, vertical static load comparison tests in different loading conditions were investigated herein. The test results show that, the load-settlement curve of the JTES pile composite foundation changed slowly. And compared with the uncovered equal section slag pile composite foundation and natural foundation, its ultimate bearing capacity increased about 22.2% and 57.1%, respectively. While settlement of JTES pile composite foundation was reduced by 12.2% and 23.1% compared to that of the other two foundations. The axial force and lateral friction resistance of JTES pile were abruptly changed. The abrupt change rates of axial force of JTES piles were 35.4%, and the lateral friction with change rate of 40.8%. The pile-soil stress ratio of the JTES pile composite foundation was in 2 ∼ 4. Then, the calculated settlements of JTES pile composite foundation were proposed. The difference between model test results and calculation values was about 10%. The results can provide important references for the design and construction of JTES pile composite foundation in soft soil improvement.

Keywords:

• pile composite foundation
• model test
• bearing characteristics
• load-transfer mechanism
• calculation method

Acknowledgments

The authors would like to express their appreciation to these financial assistances.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work in this paper is supported by grants from National Natural Science Foundation of China (NSFC) (grant numbers 51678223, 51608181), Green Industrial Project of Hubei University of Technology (grant number YXQN2017001) and Major Technological Innovation Projects of Hubei (grant number 2017AAA128). The authors would like to express their appreciation to these financial assistances.