Centrifuge model studies of salt backfill

CIM Bulletin, Vol. 87, No. 976, 1994

Euler M. De Souza, Department of Mining Engineering, Queen's University, Kingston, Ontario

This paper presents a study developed to assess the potential use of salt tailings as backfill to control surface subsidence and as a mine bulkhead used to isolate areas of potential brine inflows. A series of index tests, centrifuge model tests and quasi-static creep-consolidation tests were performed to evaluate the creep and consolidation properties of salt backfill and to evaluate the effect of brine inflow and brine infiltration on backfill behaviour. The centrifuge models were specifically designed to study the mechanical behaviour of salt backfill under the influence of brine inflow and long-term creep. Test results indicated that salt tailings could be applied underground as a bulkhead to seal off areas of potential inflow with the additional advantage of controlling room closure and local back instability. It is hoped that this study will assist mine planners to develop contingency plans to control brine inflow occurrences.

Mots Clés: Rock mechanics, Salt tailings, Brine inflow, Backfill.