Research of Cemented Paste Backfill in Offshore Environments

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Wang, Kun^1 ; Yang, Peng^1,2 ; Lyu, Wensheng^1 ; Lin, Zhixiang^3

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, China^1

Beijing Key Laboratory of Information Service Engineering, Beijing, China^2

263 Brigade of Jiangxi Nuclear Industry Geological Bureau, Nanchang, China^3

关键词: Cemented paste backfill;    Comprehensive utilizations;    Early age strengths;    Ground pressure;    Ion composition;    Offshore environments;    Underground mining;    Viscosity coefficient;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/4/042082/pdf
DOI  :  10.1088/1755-1315/108/4/042082

来源: IOP

【 摘 要 】

To promote comprehensive utilization of mine waste tailings and control ground pressure, filling mine stopes with cement paste backfill (CPB) is becoming the most widely used and applicable method in contemporary underground mining. However, many urgent new problems have arisen during the exploitation in offshore mines owing to the complex geohydrology conditions. A series of rheological, settling and mechanical tests were carried out to study the influences of bittern ions on CPB properties in offshore mining. The results showed that: (1) the bittern ion compositions and concentrations of backfill water sampled in mine filling station were similar to seawater. Backfill water mixed CPB slurry with its higher viscosity coefficient was adverse to pipeline gravity transporting; (2) Bleeding rate of backfill water mixed slurry was lower than that prepared with tap water at each cement-tailings ratio; (3) The UCS values of backfill water mixed samples were higher at early curing ages (3d, 7d) and then became lower after longer curing time at 14d and 28d. Therefore, for mine production practice, the offshore environments can have adverse effects on the pipeline gravity transporting and have positive effects on stope dewatering process and early-age strength growth.