Research on conversion coefficient of self-balanced test method in large thickness layered foundation

Journal of Lanzhou University of Technology ›› 2026, Vol. 52 ›› Issue (2): 145-150.

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Research on conversion coefficient of self-balanced test method in large thickness layered foundation

LI Wei-li^1,2, ZHANG Zhen-tao³, ZHANG En-xiang^1,2, JIANG Zong-xin^1,2GUO Zhi-yuan^1,2, YANG Yang⁴

1. Gansu CSCEC Municipal Engineering Investigation and Design Institute Co., Ltd., Lanzhou 730000, China;
2. CSCEC AECOM Consultants Co., Ltd., Lanzhou 730000, China;
3. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou730050, China;
4. School of Civil Engineering, Longdong University, Qingyang 745000, China

Received:2022-07-21 Online:2026-04-28 Published:2026-04-28

Abstract

Abstract: In order to determine a reasonable value range of conversion coefficient for the thickness of layered foundation, this study relies on the third phase of the expansion project of Lanzhou Zhongchuan International Airport. Self-balanced test piles and anchor-pile test piles with similar geological conditions, pile geometry, and construction methods were selected for comparative analysis. Using Matlab programming, the Q -s curves obtained from self-balanced tests were fitted to those from anchor-pile tests to identify the conversion coefficient range that best reflects actual engineering behavior. The results show that, for the self-balancing test piles in the large thickness layered foundation of the project area, the conversion coefficients ranges from 0.45 to 0.63 for long piles, and from 0.63 to 0.74 for short piles. Notably, both the proposed values of the self-balancing method and the actual values of the conversion coefficients are higher than the fitted values obtained in this study, resulting in engineering waste.

Key words: pile foundation, layered foundation, self-balance test method, anchor pile method, conversion coefficient

CLC Number:

TU473.1

LI Wei-li, ZHANG Zhen-tao, ZHANG En-xiang, JIANG Zong-xinGUO Zhi-yuan, YANG Yang. Research on conversion coefficient of self-balanced test method in large thickness layered foundation[J]. Journal of Lanzhou University of Technology, 2026, 52(2): 145-150.

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Research on conversion coefficient of self-balanced test method in large thickness layered foundation

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