Large-scale Direct Shear Experimental Study on Particle Breakage of Coarse-grained Soils
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Abstract:
Particle breakage is the basic property of coarse-grained soils.With the continuous construction of high earth-rock dams, the characteristics of particle breakage of coarse-grained soils under high stress are one of the important aspects for the particle breakage study. The large-scale direct shear tests were performed on the coarse-grained soils with different particle sizes to investigate the characteristics of particle breakage of coarse-grained soils under high normal stress, and the relationship between the shear stress and shear displacement at the interface was also analyzed. The results suggested that (1) with the increasing of normal stress, the particle breakage rate increases; (2) under the same normal stress, the particle breakage rate is higher when the particle size is higher; (3) the better the grading is, the lower the breakage rate is; and (4) the particle breakage mainly forms the sub-first grade particle size.
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