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Geotechnical considerations for concurrent pillar recovery in close-distance multiple seams

International Journal of Mining Science and Technology 2018年第1期28卷 21-27页

作者： Peter Zhang Berk Tulu Morgan Sears jack trackemas Ground Control Branch NIOSHPittsburgh Mining Research Division Department of Mining Engineering West Virginia University

Room-and-pillar mining with pillar recovery has historically been associated with more than 25% of all ground fall fatalities in underground coal mines in the United *** risk of ground falls during pillar recovery increases in multiple-seam mining *** hazards associated with pillar recovery in multiple-seam mining include roof cutters, roof falls, rib rolls, coal outbursts, and floor *** pillar recovery is planned in multiple seams, it is critical to properly design the mining sequence and panel layout to minimize potential seam *** paper addresses geotechnical considerations for concurrent pillar recovery in two coal seams with 21 m of interburden under about 305 m of depth of *** study finds that, for interburden thickness of 21 m, the multiple-seam mining influence zone in the lower seam is directly under the barrier pillar within about 30 m from the gob edge of the upper *** peak stress in the interburden transfers down at an angle of approximately 20°away from the gob, and the entries and crosscuts in the influence zone are subjected to elevated stress during development and *** study also suggests that, for full pillar recovery in close-distance multiple-seam scenarios,it is optimal to superimpose the gobs in both seams, but it is not necessary to superimpose the *** the entries and/or crosscuts in the lower seam are developed outside the gob line of the upper seam,additional roof and rib support needs to be considered to account for the elevated stress in the multiple-seam influence zone.

关键词： Pillar recovery Room-and-pillar Retreat mining Multiple seam Mining sequence Pillar design

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Influence of longwall mining on the stability of gas wells in chain pillars

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International Journal of Mining Science and Technology 2020年第1期30卷 3-9页

作者： Peter Zhang Heather Dougherty Daniel Su jack trackemas Berk Tulu CDC NIOSH Pittsburgh Mining Research Division(PMRD)PittsburghPA 15236USA Department of Mining Engineering West Virginia UniversityMorgantownWV 26505USA

Longwall mining has a significant influence on gas wells located within longwall chain *** subsidence and abutment pressure induced by longwall mining can cause excessive stresses and deformations in gas well *** the gas well casings are compromised or ruptured,natural gas could migrate into the mine workings,potentially causing a fire or *** the current safety regulations,the gas wells in the chain pillars have to be either plugged or protected by adequate coal *** current regulations for gas well pillar design are based on the 1957 Pennsylvania gas well pillar *** study provided guidelines for gas well pillars by considering their support area and overburden depth as well as the location of the gas wells within the *** the guidelines were developed for room-andpillar mining under shallow cover,they are no longer applicable to modern longwall coal mining,particularly,under deep *** well casing of failures have occurred even though the chain pillars for the gas wells met the requirements by the 1957 *** study,conducted by the National Institute for Occupational Safety and Health(NIOSH),presents seven cases of conventional gas wells penetrating through longwall chain pillars in the Pittsburgh Coal *** study results indicate that overburden depth and pillar size are not the only determining factors for gas well *** other important factors include subsurface ground movement,overburden geology,weak floor,as well as the type of the construction of gas *** modeling was used to model abutment pressure,subsurface deformations,and the response of gas well *** study demonstrated that numerical models are able to predict with reasonable accuracy the subsurface deformations in the overburden above,within,and below the chain pillars,and the potential location and modes of gas well failures,thereby providing a more quantifiable approach to assess the stability of the gas wells in l

关键词： Longwall mining Gas well Chain pillar Casing stability

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