In the mining of close coal seam, stress concentration under residual pillar in upper seam leads to serious deformation roadway surrounding rock lower seam. Hence, it poses a huge challenge maintenance entry rock. Based on this, an approach control technology, directional pre-splitting, and roof-cutting pressure relief, was applied. The utilizing pre-splitting relief were studied by numerical s...

Affected by coal mining activities, the remaining pillars are very likely to be destabilized and cause safety accidents. The backfilling of goaf can maintain stability pillar well, but in unfilled zone may still unstable. In this paper, effect materials on reinforcement method discussed using numerical simulation, statistical mathematics, elastic mechanics, mechanical test methods. results show...

Abstract Retaining a waterproof coal pillar is the most effective water conservation method for roadway close to gob, and determining reasonable width of has been common problem among mining scholars considerably long time. Based on 15208 face in Xinjing Coal Mine, structure divided into mine-pressure-influenced plastic zone, an elastic core pressure failure zone. The zone determined by using l...

Abstract Using goof as water storage space plays a vital role in the ecological environment and economic development of arid mining areas, while rock strength stability coal pillars underground reservoirs are closely related to creep process. In this work, triaxial creep-seepage tests were conducted for samples develop new insights into behavior permeability evolution. The results showed that d...

With the gradual increase of coal mining intensity, many pillars need to be left near stope. The stability composite structure and their overlying strata determines safety whole stope surface. This paper conducts uniaxial compression tests on coal-rock structures with same lithology height ratio finds structure’s mechanical properties failure characteristics have greater discreteness. Combining...

Coal mining with perspective of health is a crucial area in India. The health condition of mine workers including women and children is one of the most serious impacts of mining. Workers not only suffers from external environmental situation of mines also they faces reduction in quality of life due to denial of access of food availability livelihoods. India, in this aspect poses a much more dan...