主应力方向诱导风积土各向异性强度准则及试验验证

doi:10.13722/j.cnki.jrme.2022.0684

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Abstract To investigate the anisotropy and stress directional mechanical behavior of geotechnical materials，directional shear tests of aeolian soil with principal stress direction angles of 0°，15°，22.5°，30°，45°，60°，67.5°，75°，and 90° were performed using a hollow cylinder torsion shear apparatus(GDS-SSHCA). The variation law of the shear stress-shear strain curve and anisotropic strength characteristics of aeolian soil under the action of different major principal stress directions are presented. Test results shown that when ?≤30°，the shear strength of soil increases with the increase of ?；when ?＞30°，the shear strength of soil decreases with the increase of ?. Significant anisotropy exists in the strength of aeolian soil samples under directional shearing in different major principal stress directions. Based on the test results，the equivalent modified anisotropic Lade-Duncan criterion (EL-D criterion ) of aeolian soil is established by using the fabric-stress coordinate transformation based on the idea of equivalent stress and considering the stress，the size of the fabric，and the direct relationship between the stress and the fabric. The reliability of the established anisotropic criterion is verified by the directional shear test results of aeolian soil. The results show that EL-D criterion established in this paper can better describe the strength characteristics of stress-induced anisotropy in aeolian soil. The research results will provide scientific support for the study of anisotropy of geotechnical materials and the prevention and control of aeolian soil engineering disasters.

Key words： soil mechanics principal stress direction aeolian soil anisotropy equivalent stress

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	LIU Jiashun1
	2
	3
	ZHU Kaixin1
	CAI Yanyan4
	REN Yu1
	SHENG Yantao1
	LIU Yelong1

Cite this article:

LIU Jiashun1,2,3, et al. Anisotropic strength criterion of aeolian soil under stress path considering the variation of principal stress direction[J]. , 2023, 42(7): 1789-1798.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0684 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I7/1789

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