Influence of grain segregation on the behavior of sand in triaxial tests

doi:10.1007/s11629-021-6709-3

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 > 山地表生过程与生态调控重点实验室

	Influence of grain segregation on the behavior of sand in triaxial tests
	Yu Fang-wei 2,3,4,5,6; Peng Xiong-zhi 1; Su Li-jun 3,4,5,6
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2021-09-16
卷号	18 期号:10 页码:2776-2790
关键词	Critical state Dilatancy Friction Grain segregation Landslides Soil behavior Triaxial tests
ISSN号	1672-6316
DOI	10.1007/s11629-021-6709-3
英文摘要	As a common phenomenon in granular flow, grain segregation plays a great role in affecting the behavior of granular soil by causing a great change of grain-void distribution in granular soil. This paper presents an experimental study on the influence of grain segregation on the behavior of sand, by a number of triaxial tests to interpret the characteristic behavior, friction and dilatancy behavior, excess pore water pressure behavior and critical state behavior of sand incorporating grain segregation. An index - grain segregation index I-gs was proposed to quantify grain segregation. Grain segregation affected greatly the characteristic behavior of sand, causing the movement of void ratio-dilatancy relation of sand towards the increase of void ratio and dilatancy of sand. In the drained tests, the mobilized friction angle of sand showed a decrease followed by an increase but the mobilized dilatancy angle of sand increased, with increasing grain segregation index. An increase in grain segregation index impaired the basic friction of sand. In the undrained tests, the mobilized friction angle of sand showed an increase followed by a decrease with increasing grain segregation index. However, grain segregation caused an increase of the mobilized dilatancy of sand followed by a different development. An increase in grain segregation resulted in a higher summit of the dilatancy of sand but with a faster decrease along axial strain. In the q-p ' plane, grain segregation caused a reciprocating rotation of the dilatancy line and failure line of sand. Grain segregation resulted in enhancement of the peak-state dilatancy of sand, affecting greatly peak-state friction angle and peak-state basic friction angle of sand as well as the normalized excess pore water pressure. The excess friction angle of sand showed an increase followed by a decrease in the drained tests but increased linearly in the undrained tests, with increasing grain segregation index. The excess friction angle-over-maximum dilatancy angle of sand decreased in up convexity while increasing grain segregation index. Grain segregation resulted in rotation and translation of the critical state line of sand in the e-p '(alpha=0.7) plane. However, in the q-p ' plane, the critical state line of sand showed an anticlockwise rotation followed by a clockwise rotation with increasing grain segregation index.
资助项目	National Natural Science Foundation of China[41807268] ; Major Program of National Natural Science Foundation of China[41790432] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences, China[2018408]
WOS关键词	UNDRAINED SHEAR-STRENGTH ; PARTICLE BREAKAGE ; ROCK-AVALANCHE ; CRITICAL-STATE ; GRANULAR SOILS ; DRAINED SHEAR ; DILATANCY ; DEBRIS ; FLOW ; LIQUEFACTION
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000696453400004
资助机构	National Natural Science Foundation of China ; Major Program of National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences, China
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/56236]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Su Li-jun
作者单位	1.Southwest Jiaotong Univ, Dept Civil Engn, Chengdu 610031, Peoples R China 2.Univ Tokyo, Dept Civil Engn, Tokyo 1138656, Japan 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.CAS HEC, China Pakistan Joint Res Ctr Earth Sci, Islamabad 45320, Pakistan 5.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 6.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Yu Fang-wei,Peng Xiong-zhi,Su Li-jun. Influence of grain segregation on the behavior of sand in triaxial tests[J]. JOURNAL OF MOUNTAIN SCIENCE,2021,18(10):2776-2790.
APA	Yu Fang-wei,Peng Xiong-zhi,&Su Li-jun.(2021).Influence of grain segregation on the behavior of sand in triaxial tests.JOURNAL OF MOUNTAIN SCIENCE,18(10),2776-2790.
MLA	Yu Fang-wei,et al."Influence of grain segregation on the behavior of sand in triaxial tests".JOURNAL OF MOUNTAIN SCIENCE 18.10(2021):2776-2790.