Advancing Minefill Barricade Design Using Numerical Modelling

9th International Symposium on Mining with Backfill
David Sainsbury,
Abstract Barricade failure is a core geotechnical risk that is an inherent feature of any mining method employing paste or hydraulic fill. Historically within Australia the design of barricades has relied on simplified analytical solutions. Three-dimensional numerical modelling provides a method to explicitly model the actual barricade geometry, barricade construction materials, wall-rock interface and loading on the barricade. In 2005/06 a collaborative project involving six paste and hydraulic fill operations using sprayed Fibrecrete/Shotcrete/Aquacrete barricades or mullock barricades in Australia was conducted. This paper presents the findings of this study and the results of the operations where the design techniques have been implemented. Topics described include review of currently used analytical methods and their limitations, summary of field experience using shotcrete barricades, the numerical barricade model developed including presentation of the range of barricade materials and geometries studied, calibration of the model using data from failed barricades, comparison of numerical model and analytical solutions, numerical modelling of barricade loading and the instrumentation programmes being implemented to provide further understanding and calibration of the barricade model.
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