Effect of Particle Size on Shear Properties of Coarse-grained Soil

Chaofan Gong ； Zhixiang Cao ； Xinwei Song ； Lingjie Zhang ； Shifang Yuan

《International Core Journal of Engineering》 7卷1期 (2021/01) Pp. 189-194

https://doi.org/10.6919/ICJE.202101_7(1).0025

摘要

In order to explore the influence of particle size on the shear properties of coarse-grained soil, 40 groups of direct shear tests were conducted on 3 kinds of coarse-grained soil with the same dry density by DHJ50-2 shear test machine. The results show that the change of shear strength with the increase of particle size is related to dry density and vertical load. Under low density and low vertical load, the shear strength decreases with the increase of particle size; the cohesive force does not show a single change relationship with the particle size; the internal friction angle increases with the increase of particle size; the larger the particle size, the stronger the restraint effect of vertical load and the greater the dilatancy. The research results have certain significance for the follow-up study on the shear properties of complex graded soil.

關鍵字

Coarse-grained soil ； Shear properties ； Direct shear test ； Particle size

參考文獻

Varadarajan A , Sharma K G , Venkatachalam K , et al. Testing and Modeling Two Rockfill Materials[J]. Journal of Geotechnical & Geoenvironmental Engineering, 2003, 129(3):206-218.

Charles J A , Watts K S . The influence of confining pressure on the shear strength of compacted rockfill[J]. Géotechnique, 1980, 30(4):353-367.

Chang C S, Chao S J, Chang Y. Estimates of elastic moduli for granularmaterial with anisotropic random packing structure[J]. InternationalJournal of Solids and Structures, 1995, 32( 14): 1989-2008.

Majmudar T S,Behringer R P.Contact force measure-ments and stress-induced anisotropy in granular materials[J] Nature, 2005, 435(23) :1079-1082.

Hartley R R, Behringer R P.Logarithmic rate depend-ence of force networks in sheared granular materials[J]. Nature, 2005, 421(6926):928-931.