The longwall mining method is one of the most applied methods in extracting low-inclined to high-inclined coal seams. Selection of the most suitable extraction equipment is very important in the economical, safety, and productivity aspects of mining operations. There are a lot of parameters affecting the selection of an extraction equipment in mechanized longwall mining in steeply inclined coal...

Coal bursts caused by mining-induced seismicity occur in the working face steeply inclined and extra thick coal seams (SIETCSs). This article presents a case study SIETCS through discrete element simulation as well field investigation. The evolution of burst was studied from perspective stress distribution, crack propagation fragment ejection. results showed that dynamic failure mainly occurred...

As a tool for exploration of concealed coal seams by modern techniques, determination of the depth of erosion of coal seams with reference to the surface of angular unconformity underlying the remnants of a key bed is conducted for the first time in coal mines of Kerman region. The angular unconformity surface (the initial surface exposure of coal seams) separates the coal seams of Jurassic age...

In order to clarify the mechanical properties and energy changes of coal samples under influence mining depth, a test analysis method determine that increase in depth increases loading rate has been developed. Taking Wudong Coal Mine as an example, is carried out. The results show surface deformation failure process presents four stages. That is, evolution ‘complete sample’–‘partial failure-fai...

In Sichuan Province, China, most coal seams that are mined steeply inclined; their roadways’ surrounding rocks asymmetric, with non-equilibrium deformations and unstable anchorage structures, thus making major safety hazards highly likely. Using field observations a universal distinct element code (UDEC) numerical simulation method, this paper analyzed the time-dependent failure of ventilation ...