Consolidation process of uncemented backfill slurry in a mine stope considering hydro-geotechnical properties of rockmass in adjacent stopes
Guangsheng Liu, Qinghai Ma, Xiaocong Yang, Lijie Guo, Li Li
TL;DR
This study examines how the surrounding rockmass affects the consolidation of backfill slurry in mines, showing that rock properties significantly influence pore water pressure and stress development.
Contribution
The paper introduces a numerical model to evaluate the impact of rockmass hydro-geotechnical properties on backfill consolidation, offering a more accurate boundary condition approach.
Findings
Pore water pressure and effective stresses in backfill are higher with impermeable boundaries and lower with permeable ones.
Hydraulic conductivity variations in rockmass lead to a five-fold difference in peak pore water pressure and effective stresses.
Rockmass porosity and initial saturation have less impact on backfill consolidation compared to hydraulic conductivity.
Abstract
In open stoping with subsequent backfill mining, the filled slurry in one stope is typically surrounded by the rockmass in adjacent stopes. The rockmass generally contain geological faults and joints that can serve as seepage pathways for pore water within the backfill slurry during consolidation process. However, these impacts from the adjacent rockmass were usually simplified to an impermeable or permeable boundary in previous studies. In this paper, numerical modeling with FLAC3D was conducted to investigate the influences of hydro-geotechnical properties of surrounding rockmass on consolidation process of uncemented backfill slurry in a vertical stope. Results show that the pore water pressure (PWP) and effective stresses of backfill slurry confined by rockmass are consistently higher than those obtained by assuming fully permeable boundaries but lower than those derived from…
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Taxonomy
TopicsTailings Management and Properties · Rock Mechanics and Modeling · Geotechnical Engineering and Underground Structures