Khapilova N. The theory and the basic laws of the wringing out of a coal seam

The development of analytical methods of the research of the geomechanical state of a rock mass by underground coal output. The three - dimensional problem on the stressed-strained state of a rock mass near workings with the aid of a plastic regions has been generalized. The mathematical model, the computation methods and the regularities of the wringing out of a coal seam in longwall face have been considered. The influence of the mechanical properties of coal and rock, the inclination of a seam and its depth from the earth's surface on the dynamic of the process of the wringing out has been investigated in the case when the seam contains a site with destroyed coal. It has been established that the speed of rock displacement is more in the mass depth than near the face, if the latter approaches the domain of the disturbed coal. The methods have been developed to calculate the parametrs of the protective measures which are used at Donbas mines.