Modification of load transfer function forpile-soil interface in collapsible loess

Journal of Lanzhou University of Technology ›› 2024, Vol. 50 ›› Issue (2): 124-130.

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Modification of load transfer function forpile-soil interface in collapsible loess

WANG Jin-shou¹, WU Hao², YANG Yang³, CAO Ming⁴ ZHANG Wei-jun¹, DUAN Tian-hao⁵

1. Gansu Third Construction Group Company, Lanzhou 730000, China;
2. School of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou730050, China;
3. School of Civil Engineering, Longdong University, Qingyang 745000, China;
4. Qingyang Vocational and Technical College, Qingyang 745000, China;
5. State Grid Xinjiang Electric Power Co. Ltd., Xinhe County Power Supply Company, Akesu 843000, China

Received:2022-01-18 Online:2024-04-28 Published:2024-04-29

Abstract

Abstract: The consolidation settlement of soil has a great influence on negative friction acting on the sides of piles. Under the framework of unsaturated soil mechanics, based on the interaction principle of the soil-pile interface, a computation methodology for consolidation settlement of soil is proposed in this study. Firstly, according to the hydraulic equivalent principle of collapsible loess, the equivalent load after immersion is calculated. Subsequently, considering the consolidation characteristics of unsaturated soil, the governing equation of pore air and liquid under the equivalent load is established, and the formula for calculating the settlement of soil in the exhaust stage is deduced. Finally, the negative friction of the pile side is obtained according to the relationship between the settlement of soil around the pile, the axial force, and the negative friction. The rationality of the proposed method is then verified through relevant case studies. The results show that the proposed calculation method is feasible and enriches the calculation model of negative friction of the pile side.

Key words: pile foundation, consolidation of unsaturated soil, loading transfer, collapsible loess, negative skin friction

CLC Number:

TU443

WANG Jin-shou, WU Hao, YANG Yang, CAO Ming ZHANG Wei-jun, DUAN Tian-hao. Modification of load transfer function forpile-soil interface in collapsible loess[J]. Journal of Lanzhou University of Technology, 2024, 50(2): 124-130.

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Modification of load transfer function forpile-soil interface in collapsible loess

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