非饱和粉土的抗拉强度研究及其预测

doi:10.13722/j.cnki.jrme.2023.0938

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Abstract Engineering geological problems，such as slope instability and cracking of roadbed fills，are closely related to the tensile strength of soil. The Brazilian splitting test was used to study the tensile strength properties of unsaturated compacted specimens and dehydrated specimen in this study. The objective was to study the evolution of the tensile strength in unsaturated compacted and dehydrated specimens across a broad range of the water content. Results show that with decreasing the water content，the tensile strength of compacted specimens initially increases and then decreases，reaching its maximum value at a critical moisture content. Conversely，the tensile strength of dehydrated specimens continues to rise and eventually approaches a stable level. The difference between these two types of specimens can be attributed to the fact that the tensile strength of compacted specimens is mainly affected by capillary suction stress generated at the bending liquid surface，whereas the tensile strength of dehydrated specimens is primarily influenced by factors such as capillary suction stress and cohesive forces. Then, microstructure images of both types of specimens obtained through electron microscopy scanning experiments were carefully analyzed and discussed. Finally，an unsaturated soil tensile strength model was established based on an effective stress formula that considers both capillary and adsorption effects. The effectiveness of this model was verified using measured data.

Key words： soil mechanics unsaturated soil tensile strength micro-pore structure Brazilian splitting test

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	Articles by authors
	HE Wei1
	GAO You1
	LI Wanshuang2
	LI Ze1
	ZHANG Xiayang1

Cite this article:

HE Wei1,GAO You1,LI Wanshuang2, et al. Experimental study and modeling of tensile strength in unsaturated silty soil[J]. , 2024, 43(8): 2069-2078.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0938 OR http://rockmech.whrsm.ac.cn/EN/Y2024/V43/I8/2069

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