Numerical analysis of loess and weak intercalated layer failure behavior under direct shearing and cyclic loading

doi:10.1007/s11629-020-6178-0

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2020 > Vol17 No.11

	Numerical analysis of loess and weak intercalated layer failure behavior under direct shearing and cyclic loading
	Zhang, Ze-lin; Wang, Tao
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2020
卷号	17 期号:11 页码:2796-2815
关键词	Loess Mudstone Weak intercalated layer Direct shear test Cyclic shear test PFC2D
ISSN号	1672-6316
DOI	10.1007/s11629-020-6178-0
文献子类	Article
英文摘要	The mechanical behavior of the joints inside a loess layer is greatly important in weak intercalation studies owing to its involvement in a wide range of landslides in the loess region in China. The shear behavior of the joints in the loess stratum during direct shear and cyclic loadings was investigated using the PFC2D discrete element software. Loess mudstone and mudstone with weak intercalated layer materials were subjected to direct testing, and cyclic shear tests were conducted with consideration to the influence of normal stress and shear velocity. The macroscopic properties and damage patterns were obtained for six numerical configurations; namely, loess-weathered mudstone with 0 degrees, 10 degrees, and -10 degrees joints and weathered mudstone with 0 degrees, 10 degrees, and -10 degrees weak intercalated layers. The numerical test results revealed that, in the direct shear tests, the shear stress and shear displacement of the samples increased with the normal stress. In the cyclic shear tests with a total cycle number N=20, the shear stress-shear strain curve of the six different configurations exhibited a hysteresis loop. The numerical tests also revealed that, under cyclic shear, the normal stress and shear velocity affected the shear strength. The degree of damage increased as the shear velocity decreased from 0.1 mm/s to 0.005 mm/s for all six numerical configurations. Compared with the damage pattern of the direct shear tests, the damage of the cyclic shear tests mainly comprised shear cracks and fractures, some shaking consolidation settlement and fewer shear strain occurred around the joints. In the direct shear tests, more compression cracks and fractures occurred in the samples. The damage mainly developed along the joints, and shearing-off damage occurred. The results obtained by this study further elucidate the failure mechanism and microscopic damage response of the joints in the loess stratum in Northwest China.
电子版国际标准刊号	1993-0321
语种	英语
WOS记录号	WOS:000588716900015
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/50645]
专题	Journal of Mountain Science_Journal of Mountain Science-2020_Vol17 No.11
推荐引用方式 GB/T 7714	Zhang, Ze-lin,Wang, Tao. Numerical analysis of loess and weak intercalated layer failure behavior under direct shearing and cyclic loading[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(11):2796-2815.
APA	Zhang, Ze-lin,&Wang, Tao.(2020).Numerical analysis of loess and weak intercalated layer failure behavior under direct shearing and cyclic loading.JOURNAL OF MOUNTAIN SCIENCE,17(11),2796-2815.
MLA	Zhang, Ze-lin,et al."Numerical analysis of loess and weak intercalated layer failure behavior under direct shearing and cyclic loading".JOURNAL OF MOUNTAIN SCIENCE 17.11(2020):2796-2815.