Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30124
Effect of Silt Presence on Shear Strength Parameters of Unsaturated Sandy Soils

Authors: R. Ziaie Moayed, E. Khavaninzadeh, M. Ghorbani Tochaee

Abstract:

Direct shear test is widely used in soil mechanics experiment to determine the shear strength parameters of granular soils. For analysis of soil stability problems such as bearing capacity, slope stability and lateral pressure on soil retaining structures, the shear strength parameters must be known well. In the present study, shear strength parameters are determined in silty-sand mixtures. Direct shear tests are performed on 161 Firoozkooh sand with different silt content at a relative density of 70% in three vertical stress of 100, 150, and 200 kPa. Wet tamping method is used for soil sample preparation, and the results include diagrams of shear stress versus shear deformation and sample height changes against shear deformation. Accordingly, in different silt percent, the shear strength parameters of the soil such as internal friction angle and dilation angle are calculated and compared. According to the results, when the sample contains up to 10% silt, peak shear strength and internal friction angle have an upward trend. However, if the sample contains 10% to 50% of silt a downward trend is seen in peak shear strength and internal friction angle.

Keywords: Shear strength parameters, direct shear test, silty sand, shear stress, shear deformation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3299453

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 113

References:

REFERENCES
[1] Salgado, R., Bandini, P. and Karim, A., 2000. Shear strength and stiffness of silty sand. Journal of Geotechnical and Geoenvironmental Engineering, 126(5), pp.451-462.
[2] Huang, Y. T., Huang, A. B., Kuo, Y. C. and Tsai, M. D., 2004. A laboratory study on the undrained strength of a silty sand from Central Western Taiwan. Soil Dynamics and Earthquake Engineering, 24(9-10), pp.733-743.
[3] Gupta, R. and Trivedi, A., 2009. Effects of Non-Plastic Fines on the Behavior of Loose Sand− An Experimental Study. Electronic Journal of Geotechnical Engineering, 14, pp.1-14.
[4] Xiao, Y., Liu, H., Chen, Y. and Chu, J., 2014. Strength and dilatancy of silty sand. Journal of Geotechnical and Geoenvironmental Engineering, 140(7), p.06014007.
[5] Yosefpour, V, Hamidi. A, 2015. "Comparison of clay and Silty Finite content on Shear Strength parameters and Sands dilation", The First National Conference on Soil Mechanics and Foundation Engineering, Faculty of Civil Engineering, Shahid Rajaee University, Tehran, Iran.
[6] Krumbein, W. C., 1941. Measurement and geological significance of shape and roundness of sedimentary particles. Journal of Sedimentary Research, 11(2), pp.64-72.
[7] ASTM Committee D-18 on Soil and Rock, 2017. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System) 1. ASTM international.
[8] Ladd, R. S., 1974. Specimen preparation and liquefaction of sands. Journal of Geotechnical and Geoenvironmental Engineering, 100(Proc. Paper 10857 Proceeding).