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Abstract Crushing of the slag from Qincun Reservoir and the gravel-cobble from Yuxi Reservoir was studied by large-scale direct shear tests，and discarding parameters were introduced to investigate laws of breakage development from stratification planes of fractions and granular soil as a whole respectively. The results show that the relationship between discarding ratio Rk and nominal stress ? is linear for different fractions of the tested coarse-grained soils with ? varying in the research range. And difference of crushing of the two tested soils，which is mainly reflected in the grains from larger fractions，tends to disappear as grain size decreases. For coarse-grained soil as a whole，when ? varies in the range of 0–300 kPa，the breakage degrees of two soils are rather close. However，once ? varies in the range of 300–1 200 kPa，crushing of slags from Qincun Reservoir is more significant than gravel-cobble from Yuxi Reservoir. Besides，breakages of the two coarse-grained soils tend to be more remarkable as increases.
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2015, Vol. 34 
