Predicting the temperature and strength development within cemented paste backfill structures

Mamadou Fall, O Nasir
2010 Proceedings of the Thirteenth International Seminar on Paste and Thickened Tailings   unpublished
In this paper, a thermo-chemo-mechanical (TCM) model is developed and implemented into FLAC software for predicting the strength development and distribution within hydrating cemented paste backfill (CPB) structure, temperature development and distribution within the CPB structures, heat transfer between CPB structures and mine rock temperatures. The developed model is validated against results from laboratory (on CPB samples and small scale model) and field studies of CPB. The validation tests
more » ... he validation tests show good agreement between the predicted and experimental laboratory and field results. The developed tool is then used to simulate the performance of CPB structure in several practical cases of mine backfill operations. From the simulation results valuable information was gained regarding the strength and heat development within CPB structures, the optimal curing time of a given CPB structure, the effect of filling rate and stope geometry of the strength and heat development within CPB structures, the effect of mix design (e.g. %binder, water content, initial mix temperatures, tailings types) on the performance (mechanical, thermal) of CPB structures. The developed tool will contribute to more cost-effective and safer design of CPB structures. 2 Model development and validation 2.1 Modelling approach FLAC (2D) (Version 5.0, Itasca, 2005), a two-dimensional finite difference program based on an explicit Lagrangian calculation scheme, was used for the numerical modelling. Explicit means it uses a time stepping procedure to solve the problem without forming the stiffness matrix. Furthermore, the program FLAC contains a powerful built-in programming language (FISH), which enables the user to implement his own https://papers.acg.uwa.edu.au/p/1063_11_Fall/ Predicting the temperature and strength development within cemented paste backfill structures M. Fall and O. Nasir 126 Paste 2010, Toronto, Canada
doi:10.36487/acg_rep/1063_11_fall fatcat:uvlia27eibeu5kqzmpbifyqbx4