Rajmeny, PK & Vakili, A 2017, 'Three-dimensional inelastic numerical back-analysis of observed rock mass response to mining in an Indian mine under high-stress conditions', in J Wesseloo (ed.), Deep Mining 2017: Proceedings of the Eighth International Conference on Deep and High Stress Mining
, Australian Centre for Geomechanics, Perth, pp. 329-342, https://doi.org/10.36487/ACG_rep/1704_23_Rajmeny
Numerical modelling is increasingly being used to evaluate ground stability and to assist in the longterm planning of mining operations. However, selection of appropriate constitutive material behaviour and input parameters for the rock mass is still debated amongst the rock mechanics community. A case study of a hard rock mine practising sublevel open stoping has been simulated using 3D finite difference
method (FLAC3D). The mine was modelled using four types of constitutive material models — Mohr–Coulomb with post-peak cohesionsoftening/frictionsoftening, bi-linear Mohr–Coulomb with post-peak cohesionsoftening/frictionsoftening, Mohr–Coulomb with post-peak cohesionsoftening/frictionhardening and the improved unified constitutive model (IUCM). The outcome of all approaches has been compared with measured ground performance. The comparison revealed that the numerical model using the IUCM provides the most realistic match to the observations in the mine including the failure of the crown pillars.
Keywords: high stress, numerical back analysis, constitutive model
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