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Effect of Premining on Hard Roof Distress Behavior: A Case Study
Rock Mechanics and Rock Engineering, 2019Considering the complex geological conditions of mining in the fully mechanized 828 working face of the Qingdong Coal Mine, a mining plan was developed for premining the upper No. 7 coal seam to control the hard roof and gas of the No. 8 coal seam. Failure depth of the No. 7 coal seam floor and the caving interval of the hard roof were analyzed using a
Weidong Pan, Xiaodong Nie, Xinyuan Li
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Experiment simulation of hydraulic fracture in colliery hard roof control
Journal of Petroleum Science and Engineering, 2016Abstract Hydraulic fracture geometry is of paramount importance to enhance fracture effect in colliery hard roof control. Near wellbore complexity often resulted in low lateral dimension of induced fracture hence the fracking effect of the treatment.
null Cong Lin +4 more
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Μulti-jointed stratified hard rock roof analysis and design
International Journal of Rock Mechanics and Mining Sciences, 2018Abstract An arched roof can support a much greater load than a horizontal beam. This increase in the carrying capacity stems from the fact that the downward movement due to gravity creates a compressive arch. The behavior of multi-jointed hard rock roof under gravity load is hereby investigated under the novel view of the compressive arch forming a ...
Paraskevi Yiouta-Mitra +1 more
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Study on Characteristics of Energy for Hard Roof Fracture in Island Workface
Advanced Materials Research, 2013According to the characteristics of the island workface with hard roof, various mechanical models of hard roof in island workface are established, to analyze energy characteristics of hard roof before and after the first fracture in island workface with all round gobs, derived their simplified formulas of bending strain energy for hard roof before and ...
Xu Feng Pang, Ke Xue Zhang
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Analysis and design of an underground hard rock voussoir beam roof
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1996Abstract The behaviour of a voussoir hard rock beam roof is investigated by considering it to act as a symmetric flat arch with cracks at the abutments and at midspan. Analytical formulae are derived initially that evaluate, for any given geometry, loading and mechanical parameters of the beam, its deflection and strain within it in terms of the ...
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STABILITY OF UNDERGROUND STRATIFIED HARD ROCK ROOFS
1998A. I. SOFIANOS, A. P. KAPENIS
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Features of in-situ stresses in coal layers with hard roofs
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1993openaire +1 more source
Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof
Energies, 2021Manchao He, Jiong Wang, Xiaoyu Liu
exaly