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Long-hole destress blasting for rockburst control during deep underground coal mining

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    0394628 - UGN-S 2014 RIV GB eng J - Journal Article
    Koníček, Petr - Souček, Kamil - Staš, Lubomír - Singh, R.
    Long-hole destress blasting for rockburst control during deep underground coal mining.
    International Journal of Rock Mechanics and Mining Sciences. -, č. 61 (2013), s. 141-153. ISSN 1365-1609
    R&D Projects: GA MŠk ED2.1.00/03.0082
    Institutional support: RVO:68145535
    Keywords : Ostrava - Karvina Coal basin * longwall mining * rockbursts * destress blasting
    Subject RIV: DH - Mining, incl. Coal Mining
    Impact factor: 1.424, year: 2013

    The Lazy Colliery in the Ostrava–Karvina Coalfield of the Upper Silesian Coal Basin adopted modern longwall technology for an underground extraction of coal seam No. 504. This coal seam is located at a cover depth of around 700 m. The seam thickness varied from 3.1 m to 5.0 m in the selected longwall panel. Two overlying coal seams, Nos. 512 and 530 experienced mining at average heights of 58 m and 75 m, respectively, from the planned working horizon of the seam No. 504. The proposed longwall panel was adversely situated below goaf edges of the workings in these two overlying extracted seams. An analysis of the inter-burden rock mass among these coal seams showed the presence of strong, massive strata of sandstones and conglomerates with uniaxial compressive strength values between 70 MPa and 120 MPa. The stress is measured at different mining stages by Compact Conical-ended Borehole Monitoring (CCBM). A simple laboratory test of the coal sample found a high value of the ratio of the elastic deformation to the total deformation (>0.8), indicating the energy-storing characteristic (prone to burst/bump) of the coal seam.
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