Influence of particle breakage on the geomechanical behaviour of compacted coalwash
Coalwash is a waste material that results from coal mining operations. While its potential use as structural fills has been recognised in past research studies, the effects of particle breakage on the geomechanical performance of the material have not been investigated. This paper presents an experimental study of compacted coalwash tested under saturated conditions and over a wide range of stresses. The results indicate that particle breakage has a strong influence on the geomechanical behaviour of coalwash. Furthermore, the influence of particle breakage on the critical state behaviour was also analysed. While the results confirmed that coalwash is a suitable structural fill material in terms of its shear strength, its excessive deformation associated with particle breakage must be considered in order to meet specific performance criteria.