Real Time Monitoring of Cemented Paste Backfill

CIM Vancouver 2010
Murray Grabinsky, Ben Thompson,
Abstract Cemented Paste Backfill (CPB) has proven a highly efficient backfilling method due to its rapid delivery rate, the ability to engineer the required stand up strength, and the diversion of tailings to underground storage. However, the ability to predict in-situ pressures induced by CPB is limited and so mines necessarily adopt conservative backfilling strategies. The University of Toronto is conducting a major research project in order to better understand the in-situ behaviour of CPB, and so improve design strategies for backfilling (i.e. continuous versus multi-stage backfilling, binder contents, liquefaction susceptibility). In this paper, we present a case study from the third fieldwork campaign, in which stopes were instrumented and backfilling was monitored at Inmet’s Cayeli Mine in Northern Turkey. Prior to backfilling, two stopes were instrumented with orthogonal clusters of total earth pressure cells, piezometers, electrical conductivity probes and thermocouples, which were positioned at fill fences, under the stope brows, and in the main stope bodies, to capture the complete evolution of CPB behaviour during backfilling. These case studies demonstrates how monitoring of fence pressure and displacement can be used to dictate filling strategy in real time, from surface.
Keywords: cemented paste backfill, Field Study, Paste Properties, Thermal behaviour, Instrumentation, Stopes, Barricade Behaviour, Barricade loading
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