Effect and mechanism of fines content on the shear strength of calcareous sand

doi:10.1007/s10064-021-02398-w

	Effect and mechanism of fines content on the shear strength of calcareous sand
	Shen, Jianhua; Wang, Xinzhi; Wang, Xing; Yao, Ting; Wei, Houzhen; Zhu, Changqi
刊名	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
	2021-09-03
页码	21
关键词	Calcareous sand Fines content Shear strength Particle shape Dilatancy
ISSN号	1435-9529
DOI	10.1007/s10064-021-02398-w
英文摘要	Fine-grained calcareous silt interlayers with a non-uniform thickness are distributed discontinuously in the hydraulically reclaimed foundation of island-reefs in the South China Sea. Because of their high compressibility and low strength, these interlayers commonly cause differential foundation settlement and result in the cracking of buildings, which poses a potential safety hazard. In this study, consolidated-drained triaxial shear tests were conducted to investigate the effect of fines content (FC) on the shear strength of calcareous sand. The brittleness index and dilatancy coefficient were introduced to quantify the strain-softening and dilatancy of calcareous sand. The mechanism by which the FC affects the calcareous sand strength was revealed in terms of the particle shape and soil structure. Under a constant effective confining pressure, an increase in FC led to a gradual decrease in peak strength, a weakening of strain-softening characteristics, less dilation, and a linear decrease in apparent cohesion for calcareous sand. The internal friction angle of calcareous sand peaked at a FC of 10%. Compared with quartz sand, calcareous sand has the more irregular particle shape. An increase in FC weakened the interlocking between calcareous sand particles, which decreased the shear strength. The research results are of great significance for slope stability analysis and for the foundation treatment of island reefs.
资助项目	National Natural Science Foundation of China[41772336] ; National Natural Science Foundation of China[41877271] ; National Natural Science Foundation of China[41572297] ; National Natural Science Foundation of China[41877260] ; Basic Resources Investigation Project of Ministry of Science and Technology of China[2018FY100103] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA13010203]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000692458000001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27863]
专题	中科院武汉岩土力学所
通讯作者	Wang, Xing
作者单位	Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geotech Mech & Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Shen, Jianhua,Wang, Xinzhi,Wang, Xing,et al. Effect and mechanism of fines content on the shear strength of calcareous sand[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2021:21.
APA	Shen, Jianhua,Wang, Xinzhi,Wang, Xing,Yao, Ting,Wei, Houzhen,&Zhu, Changqi.(2021).Effect and mechanism of fines content on the shear strength of calcareous sand.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,21.
MLA	Shen, Jianhua,et al."Effect and mechanism of fines content on the shear strength of calcareous sand".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2021):21.