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2020, 13(5): 177-205 Back to browse issues page
Shear Strength-Dilation Characteristics of Silty and Clayey Sands
Vahid Yousefpour *1, Amir Hamidi2, Ali Ghanbari2
1- Master of Science, School of Engineering, Kharazmi University , std_yousefpour@khu.ac.ir
2- professor, School of Engineering, Kharazmi University
Abstract:   (2125 Views)
Sandy soils usually contain different amounts of fines like silt and clay, causing some changes to their shear strength and dilation characteristics. Bolton [1] conducted  some experiments on the different sands and suggested a relation between the parameters of the soil shear strength. In this paper, some experiments were performed on fine contained sand and the extended Bolton's relation was has been proposed. In this paper, shear strength and dilation behavior of a pure sand mixed with different amounts of silt or clay fines were studied using direct shear test device (100*100*30 mm), and a total of 96 tests were carried out. The samples were prepared separately using clay and silt contents of 0, 10, 20 and 30% in different relative densities of 70, 80, 90 and 100%. They were tested under three surcharge pressures of 90, 120 and 150 kPa, under particle crushing threshold. Variations in shear strength, maximum friction angle, critical state friction angle and cohesion, as well as dilation angle were investigated by increasing in the mentioned amounts. The results demonstrate that shear strength, dilation angle, maximum friction angle decreased by clay content increase, however, they increase with increase in silt content. In addition, a new form of the Bolton's relation for fine contained sandy soils was presented.
Keywords: Direct shear test, shear strength, dilation, clay content, silty sand.
Full-Text [PDF 1101 kb]   (1028 Downloads)    
Type of Study: Research Paper | Subject: Geotecnic
Received: 2019/01/20 | Accepted: 2019/07/1 | Published: 2020/06/9
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Yousefpour V, Hamidi A, Ghanbari A. Shear Strength-Dilation Characteristics of Silty and Clayey Sands. Journal of Engineering Geology. 2020; 13 (5) :177-205
URL: http://jeg.khu.ac.ir/article-1-2865-en.html

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Volume 13, Issue 5 (English article specials 2020) Back to browse issues page
نشریه زمین شناسی مهندسی Journal of Engineering Geology
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