饱和盐渍黏土弹塑性行为的试验及理论研究

doi:10.13722/j.cnki.jrme.2023.0115

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Abstract A series of triaxial compression tests involving saline condition and degree of overconsolidation are carried out to investigate the influence of type and concentration of pore solution and overconsolidation ratio(OCR) on the stress-strain curve，dilatancy behavior and other mechanical properties of saturated clay. The test results indicate that the change of the type and concentration of pore solution can change the degree of overconsolidation，deformation capacity，dilatancy ratio and slope of critical state line of clay，but it has little effect on the elastic modulus. Therefore，a new chemo-elastoplastic model is established based on UH model to simulate mechanical behavior of saturated saline clay. This model considers the impact of osmotic suction on clay?s mechanical properties and can describe its stress-strain behavior under different saline conditions. The new model introduces equivalent stress to define osmotic suction?s contribution and presents a chemical elasticity theory for saturated saline clay. Additionally，the yield surface，hardening modulus，stress-dilatancy equation and constitutive relation of saturated saline clay are derived by considering osmotic suction effects. It is observed that increasing osmotic suction leads to a“shorter and fatter”yield surface in three-dimensional stress space for saturated saline clay while reducing overconsolidation degree but increasing dilatancy ratio gradually. The universality and prediction ability of this model are verified by simulation and comparative analysis of test results of saturated saline clay under different osmotic suction.

Key words： soil mechanics saturated saline clay osmotic suction triaxial compression test stress-dilatancy behavior UH model

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	Articles by authors
	ZHOU Fengxi1
	WANG Liye1
	2
	WAN Xusheng3
	LIANG Yuwang1
	YE Weilin2

Cite this article:

ZHOU Fengxi1,WANG Liye1,2, et al. Experimental and theoretical study on elastoplastic behavior of saturated saline clay[J]. , 2023, 42(12): 3095-3108.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0115 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/3095

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