In view of the deformation and instability law hard roof without side filling retaining roadway, based on systematic construction analysis force bearing model roadway structure, this article proposes control mechanical calculation method retaining, which takes anchor beam key block above to form cantilever together, with solid coal as foundation support. The research practice show that under co...

Coal auger mining is a promising technology used for excavating thin coal seams. The efficiency of largely related to the stability mine roadways in influence zone coal-face. Roof bolting systems are such conditions. An adequate choice roof parameters only possible if one understands features stratification rocks and stages deformation array mining. Modern monitoring methods condition based on ...

Sugar beet (Beta vulgaris) is a biennial root crop that grows vegetatively in the first year and starts shoot elongation (bolting) and flowering after exposure to cold temperatures over winter. Early bolting before winter is controlled by the dominant allele of the B locus. Recently, the BOLTING time control 1 (BTC1) gene has been cloned from this locus. BTC1 promotes early bolting through repr...

Purpose.This article proposes to analyze and determine the mining design for shallow-dip deposits hosted in poor quality rock. Methods. We used UBC tool find optimal exploitation method, Rock mass rating (RMR) Q-system (Q) stope recommended rock support, numerical modeling by RS2 software with a variety of geotechnical, geometrical, technical conditions evolution unstable zone width maximum tot...

The main objective of occupational health and safety research is to minimize or eliminate the events that may cause fatal or nonfatal injuries to human workers. A commonly used technique is to devise an “incident prevention plan”, which is more often the product of thorough investigations of past reported incident events. Incident documentation and methodical reporting and systematic and thorou...

There is an increasing need to determine accurately the strength properties of tendons for an effective ground control on mines and underground structures as well as on modelling simulations. The strength properties of cables, used as cable bolts, have been evaluated mainly by their ultimate tensile strength, as this kind of test can be carried out in the field as well as in the laboratory. Onl...

The U.S. National Institute for Occupational Safety and Health (NIOSH) conducted a study to determine the effectiveness of a filtered air delivery system to reduce respirable dust exposure of roof bolter operators in underground coal mines. When performing roof bolting operations, roof bolter operators may experience exposure to high levels of respirable dust during a working shift, especially ...