泾阳原状黄土–古土壤序列抗剪强度各向异性及其机制研究

doi:10.13722/j.cnki.jrme.2019.0319

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Abstract System sampling was conducted with an interval of 1 meter at Xiushidu section of Jingyang south plateau，Guanzhong Basin，Shaanxi. Direct shear test was executed under different or same vertical pressures，and microstructure and basis physical properties including dry density，moisture content and porosity were tested. The anisotropic characteristics of the shear strength of undisturbed loess were studied，and their formation mechanisms and influencing factors were also analyzed. The results show that the structural parameters of loess present different anisotropy characteristics as well as the shear strength. The vertical shear strength is generally greater than the horizontal shear strength for the layers above L7，while the ratio of the vertical shear strength to the horizontal shear strength for L7 and below layers is less than 1. The anisotropy degree of paleosol is larger than that of corresponding loess. The main influencing factors on shear strength anisotropy of loess-paleosol sequence are the porosity and the moisture content. The effect of the porosity on the horizontal shear strength is greater than that on the vertical shear strength，while the water content is opposite. The dry density is directly proportional to the shear strength but has little effect on the anisotropy of the shear strength. The shear strength anisotropy of natural loess is due to different arrangements of soil particles by aeolian deposition and rotation and rearrangement of particles during shearing.

Key words： soil mechanics shear strength anisotropy influencing factors formation mechanism Xiushidu section

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	ZHANG Qiying1
	2
	XU Panpan1
	2
	QIAN Hui1
	2

Cite this article:

ZHANG Qiying1,2,XU Panpan1, et al. Study on shear strength anisotropy of undisturbed loess-paleosol sequence in Jingyang county#br#[J]. , 2019, 38(11): 2365-2376.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0319 OR http://www.rockmech.org/EN/Y2019/V38/I11/2365

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