Abstract
This paper presents the ring shear characteristics of abandoned Imgi mine waste materials (Busan Metropolitan City, Republic of Korea) as a function of drainage and shear velocity with the help of ring shear tests. The soil samples are mainly composed of gravelly sands with little percentage of fines. Normal stress, drainage (drained/undrained condition) and shear velocity (0.01–100 mm/s) were applied under the unlimited shear deformation. The test results show that the peak and residual shear strength were influenced as a function of shear velocity. The shear stresses increase with increasing shear velocity. The shear stresses measured from drained condition is much larger than those from undrained condition at the same shear velocity. It is due to the fact that a progressive grain crushing and sedimentation may occur strongly in the drained condition. Grain crushing is also significant with shear velocity: the higher the shear speed, the larger the crushed fines. Thus, high mobile characteristics of failed masses should be examined in terms of grain crushing and pore water generation.
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