Stress behaviour of cemented paste backfill within temperature controlled stope model

ABSTRACT

Cemented Paste Backfill (CPB) undergoes transient changes in stress behaviour during curing, influenced by geothermal gradient and cement hydration. This study explores CPB’s response to temperature variations in a semi-confined narrow wall, simulating mining stope conditions. The results revealed that arching effects restricts vertical expansion of CPB slurry leading to temperature-induced thermal stress that often exceeding total stress estimation. Temperature change at different stage of backfill resulted in different level of stress generated due to the material state. These findings suggest the need to consider thermal behaviour in the relevant designs to improve safety in the mining industry.

KEYWORDS:

• Mine stope
• cemented paste backfill
• narrow wall
• temperature
• arching effect

Acknowledgments

The authors would also like to acknowledge, as well as the technical support and facilities provided by the Geotechnical Engineering Laboratory, The Department of Civil Engineering, University of Malaysia Sarawak.

Disclosure statement

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

Data availability statement

The data that support the findings of this study are available from the corresponding author, Alsidqi Hasan, upon reasonable request.

Additional information

Funding

This research is financially supported by Fundamental Research Grant Scheme (no. FRGS/1/2023/TK06/UNIMAS/02/2 with a title: Behavior of thermal contraction on cemented paste backfill in mine stope, by the Ministry of Higher Education Malaysia.