Undrained behavior and shear strength of clean sand containing low-plastic fines

2nd International Conference on Sustainable Development in Civil, Urban and Transportation Engineering

地球科学;运输工程;经济学

Phan, Vu To-Anh^1 ; Hsiao, Darn-Horng^2

Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam^1

Department of Civil Engineering, National Kaohsiung University of Applied Sciences, Taiwan^2

关键词: Confining pressures;    Consolidated-undrained triaxial;    Deviator stress;    Effective internal friction angle;    Experimental test;    Friction angles;    Pore-water pressures;    Undrained behavior;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/143/1/012020/pdf
DOI  :  10.1088/1755-1315/143/1/012020

来源: IOP

【 摘 要 】

This study presents experimental tests to understand the undrained behavior of sand containing various fines contents. The specimens were prepared by the wet tamping method. The consolidated undrained triaxial shear tests were carried out by sands mixed with amounts of fines in ranging from 0 to 60%. The results showed that the deviator stress quickly reaches the peak value with an axial strain in a range of 0.5 to 2%, and then, the value drops significantly with further increases in the axial strain, the pore water pressure of all the sand-fines mixtures rapidly increases as the axial strain reaches a value in a range from 1 to 2% and then slowly increases and reaches a stable state when strain is greater than 8%. Peak deviator stress gradually decreases with an increasing fines content from 0 to 40%, thereafter, the peak deviator significantly increases with further increases in the fines content up to 60%, irrespective of confining pressure values using in these tests. Finally, the effective internal friction angles are remarkably greater than the total friction angles for various sand-fines mixtures.