An Investigation of the Uniaxial Compressive Strength of a Cemented Hydraulic Backfill Made of Alluvial Sand

摘要: Backfill is commonly used in underground mines. The quality control of the backfill a key step to ensure it meets designed strength requirement. This done through sample collection from environment, followed by uniaxial compression tests obtain Uniaxial Compressive Strength (UCS) laboratory. When cylindrical cemented samples are axially loaded failure, several failure modes can be observed and mainly classified into diagonal shear axial split failure. To date, UCS obtained these two considered same with no distinction between them. In this paper, an analysis results on hydraulic made alluvial sand at Canadian mine over course more than three years presented. show that values generally higher those for recipe curing time. highlights importance making different Their difference mechanism explained. Further investigations sources data dispersion tend indicate laboratory following current practice may not representative in-situ distribution stopes due segregation backfill.