A New index and control method of filling effect for cemented paste backfill in coal mines
Hao Liu, Xuejie Deng, Xiaoming Shi, Zhenchao Wang, Ning Jia, Erol Yilmaz, Liguo Bian
Abstract
The scientific filling effect characterization is very important for backfill mining. A new filling effect index, the final backfill ratio (FBR), is proposed through experimental tests and theoretical analysis, and the sensitivity of FBR is studied in this paper. The control method of FBR is obtained and applied to optimise the filling effect for the backfill panel in Kailuan Group in China. It is concluded that every 0.05 m reduction of the void between the filling body and roof corresponds to 1.87% increase in FBR. FBR increases by 1.47% and 3.15% respectively when the UCS of the backfill body increases from 2MPa to 3MPa and 4MPa.
Topics & Concepts
Coal miningGeotechnical engineeringRoofCoalEnvironmental scienceEngineeringGeologyMaterials scienceMining engineeringWaste managementStructural engineeringTailings Management and PropertiesRock Mechanics and ModelingMine drainage and remediation techniques