Noise is one of the most pervasive health hazards in mining. A compilation of Mine Safety and Health Administration (MSHA) noise survey data for Fiscal year 1990 shows that approximately 40% of the total samples taken for longwall occupations exceeded the Permissible Exposure Limit (PEL) of 100% [Gigliotti et al. 1991]. In order to properly determine workers’ exposures on longwall coal mining s...

In fully mechanized caving mining, the earlier top coal enters limit-equilibrium zone, easier it is for leakage to be induced in front of support. As dip angle seam increases, support drastically reduces stability stope support–surrounding rock system. this study, theoretical analysis, a physical simulation experiment, numerical simulation, and field measurements were performed consider influen...

In this study, based on the engineering background of No. 8222 working face Tashan coal mine in Shanxi Province, China, true triaxial experiments were carried out Geotechnical Consulting and Testing Systems rock mechanics testing machine using cubic samples, numerical simulation was conducted through FLAC3D software. Moreover, stress evolution law different layers extra-thick seams failure mech...

In a multi-agent system, the complex interaction among agents is one of difficulties in making optimal decision. This paper proposes new action value function and learning mechanism based on equivalent neighborhood (OEAN) order to obtain decision from agents. Q-value function, OEAN used depict between current agent others. To deal with non-stationary environment when act, inferred simultaneousl...

Nowadays we can observe the change of the structure of energy resources, which leads to the increasing fraction of a renewable energy sources. Traditional underground coal mining loses its significance in a total but there are countries, including Poland, which economy is still coal based. A decreasing coal resources imply an exploitation a becoming harder accessible coal beds what is connected...

Barometric pressure changes affect air density, leading to change in the mass of the gas in the gob. When the barometric pressure decreases, the volume of gas in the gob expands, while the volume of gas contracts when the barometric pressure increases, causing the gob to breathe out and in. Although the concept of gob “breathing” is simple, its effect on spontaneous heating of coal in the gob a...