Mine roof fall characteristics of 250 falls in 5 different room-and-pillar coal mines, located in Pike, Martin, and Floyd counties, Kentucky, were investigated to determine the relationship of selected parameters associated with roof failure and the assumed condition of the mine roof before failure. The selected parameters used in the study included: presence of cracks and water before the occu...

Based on the special spatial position of 1–2 coal and 2–2 coal, this paper adopts a new way modeling by fish overcomes difficulty modeling, simulates influence pillar 22,206 return airway after mining seam Flac3D, studies under primary secondary mining, puts forward support scheme airway. The following conclusions are obtained: (1) After stress 22,206–return residual increased. maximum is below...

There are various criteria that need to be examined alongside each other when designing a longwall mining system. Challenges such as determination of the supported roof width, support system design, caving height determination, lateral or chain pillar size determination, and optimum support design for the main gate and tail gate roadways have to be tackled for this aim. Three-dimensional analys...

The article proposes a constructive technical solution to increase the contact adaptivity of mechanical roof support. developed mechanized support section is able adapt changing mining and geological conditions in process excavation pillar, which increases efficiency safety coal longwall.

Determination of reasonable protective coal pillar width has a great significance for the safety and stability seam working face surrounding structures facilities. For studying pillar, based on platform ABAQUS, program with PYTHON language to make dynamic model which can simulate changes different width. Then, deformation law floor roadway under protection is analyzed. The finite element optimi...

The dynamic load effect of supports is mainly caused by the movement roof structure and transfer overburden. In view practice issue that phenomenon strong ground pressure easy to happen, when working face lower coal seam passes inclined pillar in shallow buried closely multiple-seam, it will lead supprot damaged. This paper takes mining over-inclined pillars 22410 Bulianta Coal Mine as backgrou...

Possible issues during mining of the upper coal seam in old goaf nearby seams, including step subsidence, gas overflow goaf, and roadway around rock fragmentation. Using Hanjiawa Coal Mine’s mining, which takes place 28 m above working face lower seam, as research’s focal point. The paper focuses on self-stability pillar failure form floor, roof caving rule bearing capacity interlayer strata us...