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http://dx.doi.org/10.7474/TUS.2021.31.6.623

A Fundamental Study on Shearing/Bonding Characteristics of Interface Between Rock Mass and Backfills in Mine Openings  

Kim, Byung-Ryeol (Korea Institute of Limestone & Advanced Materials)
Lee, Hyeon-woo (Dept. of Integrated Energy and Infra system, Kangwon National University)
Kim, Young-Jin (Korea Institute of Limestone & Advanced Materials)
Cho, Kye-Hong (Korea Institute of Limestone & Advanced Materials)
Choi, Sung-Oong (Dept. of Energy and Resources Engineering/Integrated Energy and Infra system, Kangwon National University)
Publication Information
Tunnel and Underground Space / v.31, no.6, 2021 , pp. 623-646 More about this Journal
Abstract
As the demand for electric power increases with acceleration of electrification at home and abroad, the needs for coal-fired electrical power plant are accordingly increased. However, these coal-fired electrical power plants induce also many environmental problems such as increase of air pollutants, increase of possibility of land contamination by reclamation of coal ash, even though these power plants have a good economical efficiency. In case of a by-product of coal-fired electrical power plants, only 70% of them are recycled and the remaining 30% of by-product are fully buried in surrounding ground. Consequently, this study deals with coal ash backfilling mechanism in abandoned mine openings for the purposes of increasing the coal ash recycling rate as well as securing the mine area stability. In order to analyze the backfill and ground reinforcement by interaction between rock mass and backfills, the copying samples of discontinuous surface with different roughnesses were produced for bond strength tests and direct shear tests. And statistical analysis was also conducted to decide the characteristics of bond and shear behavior with joint roughness and their curing day. Numerical simulations were also analyzed for examining the effect of interface behavior on ground stability.
Keywords
Coal-ash; Backfilling in abandoned mine; Interface between rock mass and backfills; Bond strength; Shear behavior;
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