Engineering Property Changes and Environmental Effects on Coal Mine Wastes Due to Slaking

摘要

Fresh coal refuse was sampled at 21 U.S. mines; 5 were drilled, sampled, and tested more extensively than the remaining 16. Field tests included standard penetration tests and in situ density determinations. Laboratory testing included specific gravity, gradation, maximum and minimum density tests, 9-inch drained triaxial tests, 9 and 10-inch permeability tests, slake-durability tests, and accelerated slaking tests. Some refuse sites had significantly lower shear strengths and permeabilities in old, slaked, or weathered material than in fresh refuse. The state-of-art in slaking research, and the implications of slaking on coal refuse disposal, and on practical methods of managing slaking, were also studied.