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Definition of the roof strata movements in longwall mining method
2018In longwall mining method, one of the most important factor for production plannig and support design is geomechanical properties of hangingwall and behaviour of the roof strata during cool excavation. There are many mathematical formulations developed to determine the height of immediate roof but in situ measurements always give a better idea to ...
Onur, AH +4 more
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UDEC Numerical Simulation Research of Mining Overlying Strata Movement Regulation
Applied Mechanics and Materials, 2013The process of fractures developing of coal and rock and overlying strata movement is a temporal dynamic evolution process. In this paper, based on the research object a working face of a mine, using the UDEC numerical simulation software to research the movement of the working face upper strata in mining process, the results showed that the overlying ...
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Centrifuge modelling of twin-tunnelling induced ground movements in loess strata
Arabian Journal of Geosciences, 2017A great concern for the safety of large cross-section tunnels, which are being or to be built in the loess strata of China, is attracted. Generally, loess is a multi-phase porous medium and develops complex stress and strain variation while executing a tunnel project.
Junling Qiu +4 more
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Three-dimensional strata movement around coal face of steeply dipping seam group
Journal of Coal Science and Engineering (China), 2008Steeply dipping seam group, which has complex occurrence conditions, belongs to the steeply dipping seam. The research on the strata movement around the coal face not only improves safe production technology in practice, but also develops the mining theory.
Yong-ping Wu +3 more
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Ground movement, strata fracturing and changes in permeability due to deep longwall mining
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1991Abstract This is an emperical study of the sub-surface deformation caused by retreating longwall mining. The strata movement was monitored by a multi-wire borehole instrumentation system consisting of mechanical anchors installed at different horizons in a borehole drilled over a longwall panel.
L. Holla, M. Buizen
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Strata‐Movement Concepts and the Hydrogeological Impact of Underground Coal Mining
Groundwater, 1986ABSTRACT A review of mining‐engineering concepts and studies in mine hydrology suggests a conceptual model linking the strata deformation, hydraulic property changes, and ground‐water impacts due to underground coal mining. The pressure‐arch deformation pattern about a small opening creates a local zone of increased permeabilities and
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Analytical determination of strata movement parameters
Gornyi Zhurnal, 2020A. V. Zhabko +2 more
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Scale model studies of strata movement around mine roadways—IV. Ribside support
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1970Abstract Results are given of a scale model study to ascertain whether closure in a supported roadway is dependent upon ribside pack width, pack density and the presence of a dummy ribside waste. It was found that floor lift increased with decreasing ribside pack width, that both roof lowering and floor lift were greatest in roadways with solid ...
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The Influence of Previous Workings and Mining Practice on Strata Movement
1983Discussion so far has assumed a virgin rock mass that is being worked through for the first time on a large scale in the course of extracting a seam. In most cases, however, the subsidence engineer is concerned with strata that have been mined repeatedly — as, for example, when there have been previous workings in the same seam, or when a deposit ...
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