Investigation on application of filling mining technology pass through abandoned roadway of reclaimed working face.

Autor: Hong ZJ; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.; The project of Henan Key Laboratory of Underground Engineering and Disaster Prevention (Henan Polytechnic University), Jiaozuo, China., Chen S; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China., Li ZH; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China., Chen ZX; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China., Cui X; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China., Xu L; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2023 Sep 29; Vol. 18 (9), pp. e0291519. Date of Electronic Publication: 2023 Sep 29 (Print Publication: 2023).
DOI: 10.1371/journal.pone.0291519
Abstrakt: This paper aims to analyze the roof stability when the reclaimed working face passes through abandoned roadway. The mechanical model of main roof in abandoned roadway was established for the purpose of theoretical analyses. To ensure the stability of the abandoned roadway, the strength formula of backfill body was deduced. The optimum ratios among different compositions of the filling material were determined by experiment, while the viscosity, bleeding, hydration temperature and compressive strength of filling material were also studied. Test results indicated that the optimum ratio among coal ash, lime and compound activator is 80:15:5, and the ideal water cement ratio is 0.7:1. It was also found that no bleeding occurred, the rheological behavior of slurry presented shear thinning fluid and the hydration temperature of filling body was relatively stable which is mainly maintained at 40°C. The uniaxial compressive strength of filling material with 28 and 90 days curing were 3.35 and 6.62 MPa respectively. Under a confining pressure environment, the filling material presented an obviously plastic deformation. Field test showed that the filling rate was almost 100%, when working face passed through abandoned roadway, the surface of filled body was complete and no roof collapse was triggered. Therefore, a better bonding effect was proved for the filling body.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2023 Hong et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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