In order to protect surface buildings and maximize the recovery of coal resources, there are a large number strip pillars unfilled goafs left in mining areas China. Affected by comprehensive factors such as long-term overlying rock load, water accumulation goafs, adjacent mining, instability probability pillar increases greatly, which becomes potential hidden danger disaster. However, law movem...

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method rock burst prevention, used in black coal mining with longwall system. In order to define changes seismic activity due DHF at “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding mass during system using roof layers collapse. was recorded area itself, where, on...

Coal gangue is widely used as a filling material in coal seam mining. During the steeply dipping seam, loading rate, gradation, and speed have an important impact on deformation failure of gangue, further affect bearing overlying strata control surrounding rock movement deformation. Therefore, this article uses self-made steel cylinder to conduct compression test HCT pressure testing machine. T...

Studies regarding the reuse of a gob-side roadway formed by N00 longwall mining method are scarce. To investigate mine pressure behavior characteristics during reuse, anchor cable force, roof-to-floor deformation, and working resistance hydraulic support obtained from verification face were analyzed. Test results show that influence range mining-induced was 0-90 m in front face. The ratios firs...

Water quality along the Waratah Rivulet in the Woronora Lake Catchment, New South Wales (NSW), Australia, has been monitored during the last three years by the Sydney Catchment Authority. Water quality data shows changes in chemical composition due to cracking of streambeds and rockbars, and diversion of surface water into subsurface routes in the Hawkesbury Sandstone aquifer. Water quality ups...

In mining of inclined coal seams in Tangshan coal mine of Kailuan group, gateways on either end of a panel were both typically located along the floor and a gateway pillar between adjoining panels was left unmined between adjacent panels to ensure stability, thus forming a planar mining system. According to the practice, however, it turned out that this conventional mining system has long-stand...

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.

Longwall fully comprehensive mechanized mining is mainly used for the working faces of shallow coal seam with large height, which usually have a suspended roof at face end. The overhang end leads to stress concentration, affects safe face. In this paper, we use 15210 (overhanging area 50~70 m2) Zhangjiamao mine as study background, physical simulation, numerical calculation and theoretical anal...

The range of values ​​of the coefficient resistance to movement chain typical longwall armored face conveyors and inner viscous friction in chain, both immersed moving load during idle run conveyor, is estimated. computer model conveyor built as a multi-mass elastic-viscous stretched closed without sag with number masses n = 200 one induction drive motor located head conveyor. Using constructed...