Based on the field conditions of Huojitu Coal Mine Shendong coal in Northern China, eight dynamic numerical models are developed to examine interaction between shield and surrounding rock longwall panel. The take into consideration actual mining process simulate change working resistance for same shallow burial but with different height conditions, ranging from 2.5 7 m. results show that averag...

Methane emissions from the active face areas and from the fractured formations overlying the mined coalbed can affect safety and productivity in longwall mines. Since ventilation alone may not be sufficient to control the methane levels on a longwall operation, gob vent boreholes (GVB), horizontal and vertical drainage boreholes, and their combinations are drilled and used as supplementary meth...

The purpose of the paper is to substantiate width barrier and yield pillars for application a new seam development scheme in conditions Alardinskaya mine (Russia). develops gas-bearing coal seams that are prone spontaneous combustion hazardous due rock bumps, which leads frequent accidents. analysis world experience mining being bumps showed safe with longwalls can be provided by system inter-p...

For underground mining and construction, it is important to obtain a discontinuities’ model of rocks for simulations to evaluate rock stability around the working space and fluid flow in these rocks. We have developed a method using the fractal property of acoustic emission (AE) source distribution to construct a feasible crack distribution model. We confirmed the usefulness of the model throug...

Mining operations cause volumetric deformations within the rock mass and changes in its density, to which gravimetric method is sensitive. These are particularly well seen periodic measurements of local gravity field. The paper analyses relationship between movement a longwall coal seam change distribution field time space observed on ground surface. Relative were carried out six series 2018 20...

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...

SAR Interferometry is a method that allows to measure land subsidence on radar coherent areas with high precision. This method can measure displacements of the terrain surface smaller than one centimeter. A very important feature of the method is that since the SAR data are acquired frequently it is possible to use archived data to measure deformations over the last fifteen years for almost any...