Stability of the retained goaf-side gateroad (RGSG) is influenced mainly by the movements of the roof strata near coal seam after coalface passes by. To make effective controlling technology for the stability of the RGSG, we analyze the roof structure over the RGSG to illustrate the mechanism causing the RGSG instability under different roof conditions. We then examine the dynamic evolution of ...

Over significant areas of the UK and western Europe, anthropogenic alteration of the subsurface by mining of coal has occurred beneath highly populated areas which are now considering a multiplicity of 'low carbon' unconventional energy resources including shale gas and oil, coal bed methane, geothermal energy and energy storage. To enable decision making on the 3D planning, licensing and extra...

Chang 8 oil deposit, developed in Hohe and Jihe oil fields at the southern Yi-Shan Slop of Ordos Basin, is regarded as a kind of typical sand reservoir formation with super-low porosity, poor permeability, strong anisotropy as well as locally natural faults and fractures. The previous studies believed that matrix reservoir has a good permeability, whereas fracture reservoir has a reverse manner...

The distribution of Selenium (Se) in the Jurassic-Cretaceous Mist Mountain Formation of southeastern British Columbia was documented in a previous study by Ryan and Dittrick (2001). As part of that study, complete sections of rock types, including coal seams were sampled, as well as various materials segregated by mining such as coarse refuse and solid tailings from tailings ponds. Preliminary ...

Chief Executive Officers of the National Mining Association (NMA) for the Mine of the Future (MOF) and their prioritized Technology Development Road Map, together with a 2010 Section 11 National Research Council/National Engineering Academy Study, confirmed that boundary detection in coal and metal/nonmetal mining remains a mining technology gap. The National Aeronautical and Space Administrati...

According to the basic parameters of Yangquan mining area, based on determined meso physical and mechanical geological parameters, several groups numerical calculation models considering different fracturing (water injection flow water time) are established. Then, simulation test is carried out by using particle discrete element program, influence effect related coal seam hydraulic analyzed num...

Recent NIOSH published information has shown an increase of rapidly progressive coal workers’ pneumoconiosis (CWP) in the southern Appalachian coal region (SAR) of the U.S., despite the fact that compliance data indicates that most coal miners have been exposed to coal mine dust concentrations below the statutory limit of 2.0 mg/m3. While the exact cause of these elevated CWP levels in the SAR ...

In this paper a one-dimensional analytical model for the mechanism of rock fracturing in hydrothermal regimes is described. The model is based upon the modern thermo-poro-elasticity theory and its two non-linear heat-like equations. On the boundary aquifer-caprock a buried thermomechanical source is supposed to be built up in terms of subsurface fluid-rock coupling dynamics. With this considera...

Rock burst is one of the most serious risks for underground coal mines, and associated dynamic waves generally cause roof falls large-scale shrinkage roadway. The roadway often seriously damaged by duplicated rock bursts. Previous research on propagation attenuation shock cannot explain well failure mechanisms surrounding under waves. To fill this gap, paper presents comprehensive fracturing pr...

The instability and fracturing of gas drainage boreholes are one the main causes low efficiency. Based on rock mass energy principle Barenblatt model, evolution coal–rock around hole, conversion characteristics dissipated Ud, propagation pattern initial tensile cracks were investigated. results show that based process energy, failure samples containing holes can be divided into an dissipation s...