Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams [PDF]
Energies, 2022 Aiming at the problem that it is difficult to achieve accurate laying of model and precise excavation of roadways in special surrounding rock structure roadway according to conventional physical similarity simulation, which reduces the reliability of ...
Pengze Liu +9 more
doaj +2 more sources
Research on location optimization and application of the gob-side entry retaining by roof cutting in close-distance coal seams [PDF]
Scientific ReportsCompared to traditional long-wall mining, the gob-side entry retaining by roof-cutting (GERRC) technology reduces the amount of entry excavation by 50%, and recovers the previously wasted coal pillar resources, which has obvious superiority in mining ...
Qiang Fu +6 more
doaj +2 more sources
Mechanical analysis and application of floor failure mechanism under repeated mining in close-distance coal seams. [PDF]
Sci RepThe stress state of primary rocks is redistributed during coal mining, which leads to deformation and failure of the floor strata. Coal seam floor experiences repeated additional stress from the mining of two overlying seams in close-distance mining.
Li Y, Yao Y, Zhu T, Zeng F, Chang G.
europepmc +3 more sources
Overlying Rock Activity Laws and Influential Ranges of Coal Seam Mining in Stubble Areas [PDF]
Geofluids, 2022 This report applies theoretical analysis, similar material simulations, and numerical simulation methods to study the overburden strata movements and influential range of coal mining under pressure stubble conditions and to elucidate the relationship ...
Baoxin Jia +3 more
doaj +2 more sources
Gong-kuang zidonghua, 2021 In the existing methods of close distance coal seam group gas control, there are problems such as large engineering quantities, high cost and long cycle.
ZHANG Chaoju1 +4 more
doaj +2 more sources
Study on Pillar Stability of Wongawilli Mining Area in Shallow Close Distance Coal Seams [PDF]
Procedia Earth and Planetary Science, 2009 AbstractIn order to ensure the lower working face safety production under Wongawilli mining area pillars in shallow close distance coal seams in Bulianta coalmine, the influence of Wongawilli coal pillars’ stability in upper coal seam on lower working face is studied by three-dimensional simulation and field measurement.
Zhu, Wei-bing +4 more
openaire +2 more sources
Stability control of goaf‐driven roadway surrounding rock under interchange remaining coal pillar in close distance coal seams [PDF]
Energy Science & EngineeringThe roadway surrounding rock stability under the influence of interchange remaining coal pillar in close distance coal seams is one of the key factors affecting the coal mines safe and efficient mining.
Chengshuai Wang +2 more
doaj +2 more sources
An Improved Composite Fly Ash Gel to Extinguish Underground Coal Fire in Close Distance Coal Seams: A Case Study [PDF]
Advances in Materials Science and Engineering, 2020 Fire extinguishing with the superior performance of fly ash composite colloid material is a cost‐effective colloid fire prevention technology. In this paper, a new powder additive (suspending agent (XK‐XJ) and gelling agent) was developed for the existing fire extinguishing technology of fly ash compound colloid.
Jun Guo +4 more
openaire +4 more sources
Research on surrounding rock control technology for gob-side entry in close-distance lower coal seam. [PDF]
Sci RepResearch on the surrounding rock control technology of along-the-gob roadways in close-distance lower coal seams of the Xiaoyu Mine in Shuozhou City, Shanxi Province, is conducted using theoretical analysis, numerical simulation, field application, and effect monitoring.
Li S, Wang Z.
europepmc +3 more sources
Research on the attenuation characteristics of seismic energy in multicoal seam mining and the warning method of rock burst [PDF]
Energy Science & EngineeringThe mechanism of rock burst induced by the superposition of dynamic and static loads in multicoal seam mining is unique. To investigate the propagation attenuation law of large‐energy microseismic events and the induced mechanism of rock burst under this
Hongwei Mu +6 more
doaj +2 more sources