A New index and control method of filling effect for cemented paste backfill in coal mines

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.

KEYWORDS:

• Cemented paste backfill
• final backfill ratio
• characterization model
• Sobol sensitivity analysis
• control method

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the National Natural Science Foundation of China [52034009]; National Natural Science Foundation of China [52274149]; the Yue Qi Young Scholar Project [2020QN03]; and the Fundamental Research Funds for the Central Universities [2023YQTD02].