In longwall mining, premining prediction of methane emission rate depends on a number of geological factors, geographical factors, and operational factors. These same factors also can impact the selection of a specific degasification system. This study proposes a principle component analysis (PCA) and artificial neural network (ANN) approach to predict the ventilation methane emission rates of ...

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...

Longwall mining is one of the most widespread methods globally. During preliminary development working, coal seam sectioned into panels divided by protective pillars. The pillars are necessary for maintaining service life underground mines, a highly productive stope, and personnel safety. In this work, we apply finite-difference continuum damage mechanics approach to modeling stress–strain evol...

A longwall water jet mining machine called the Hydrominer has been developed at the University of Missouri-Rolla under a Bureau of Mines contract. The first design, referred to as Hydrominer One, has been extensively tested in an open pit mine and has clearly demonstrated that the working principle is viable. The second and greatly improved version, Hydrominer Two, has been built but has not as...

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.