数值极限分析法确定黏性土地基承载力系数方法研究

doi:10.11896/cldb.25010095

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Abstract Traditional limit analysis methods for calculating the ultimate bearing capacity of foundations under strip loads rely solely on empirical formulas, making it difficult to obtain precise solutions for ultimate bearing capacity of a foundation with heavy soil, especially for cohesive soil foundations, where the calculation error in bearing capacity coefficients is relatively large. In order to accurately calculate the ultimate bearing capacity of cohesive soil strip foundations, a calculation and analysis model for the bearing capacity coefficients of cohesive soil foundations with a foundation width B ranging from 3.2 to 6 meters was established. The bearing capacity coefficient N_γ of cohesive soil was calculated using the load increment method. The results show that the bearing capacity coefficient N_γ calculated based on the load increment method has an error of 0.95% compared to the results obtained using PLAXIS software with the limit strain method, indicating a relatively reliable calculation. A comparative analysis with the results for foundation width B ranging from 1 to 3 meters reveals that the failure surface is distinct in the calculation results for B=3.2—6.0 m, whereas it is not distinct for B=1—3 m. When B=3.2—6 m, the calculation errors for the bearing capacity p_u2, p_u using traditional empirical formulas are significantly larger than for B=1—3 m, indicating that traditional empirical formulas cannot accurately determine the bearing capacity coefficient N_γ for B=3.2—6 m. Finally, based on the calculation results, a graphical representation of the bearing capacity coefficient N_γ of cohesive soil strip foundations in relation to foundation width B and friction angle φ was provided, offering parametric guidance for the calculation of bearing capacity in cohesive soil foundations.

Key words： sticky soil foundation foundation bearing capacity coefficient load increment method limit strain method practical method

Published: 10 November 2025 Online: 2025-11-10

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TU47

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	ZHENG Yingren
	YANG Yingming
	LIU Yuanxue
	ABI Erdi
	TANG Deying

Cite this article:

ZHENG Yingren,YANG Yingming,LIU Yuanxue, et al. A Practical Method for Determining Bearing Capacity Coefficient of Cohesive Soil Strip Foundation by Numerical Limit Analysis[J]. Materials Reports, 2025, 39(21): 25010095-6.

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https://www.mater-rep.com/EN/10.11896/cldb.25010095 OR https://www.mater-rep.com/EN/Y2025/V39/I21/25010095

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