不同吸力分布下条形地基极限承载力解答

doi:10.13722/j.cnki.jrme.2017.1391

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Abstract Formulas of Terzaghi?s ultimate bearing capacity for a strip foundation with different suction distributions were developed based on the unified solution of shear strength for unsaturated soils under plane strain condition. The overall effects of matric suction，four types of suction distribution，intermediate principal stress and roughness of foundation base were taken into account. The formulas were validated through comparison with the model tests，the upper-bound theory and the suction stress method available in the literature. The parametric studies were carried out. It was found that the infiltration depth had an important impact on the bearing capacity of foundations under suction distributions of type I and type II，and the former had four stages while the latter had three stages. The effect of matric suction under uniform suction is more significant than that under other three suction distributions in the low suction range. The dual-effect of high suction makes the bearing capacity to decrease gradually and to stabilize eventually. The effect of high suction under uniform suction is greater than that under linear suction and suction of type II. The bearing capacity of foundations increases with the intermediate principal stress. The strengthening effect of effective strength parameters is obvious. The effect of roughness of foundation base cannot be ignored. Moreover，the difference between the effects of matric suction and roughness of foundation base should be distinguished.

Key words： foundation engineering strip foundation ultimate bearing capacity suction distribution intermediate principal stress Terzaghi?s theory

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	ZHANG Changguang1
	2
	YAN Qing1
	ZHOU Fei3
	ZHANG Chenglin1

Cite this article:

ZHANG Changguang1,2,YAN Qing1, et al. Formulas of ultimate bearing capacity for strip foundation on unsaturated soils with different suction distributions[J]. , 2018, 37(5): 1237-1251.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1391 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I5/1237

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