Considered are the thermodynamic conditions on the surfaces generated in coal cracks in the process of its destruction. It is shown that the temperature at the surface of cracks on the stage of destruction is comparable with the melting temperature of coal and ignition of methane. Ratios for the assessment of the development phase transitions on the surfaces of coal cracks. It is shown that the rate of methane in proportion to the total surface of the pieces of coal at de-struction. To reduce the amount of methane generation it is recommended to reduce the load on the breakage face.
Status of the marginal zone of the reservoir developed largely determines the conditions of interaction of mechanized roof supports of the complex and surrounding rocks, and also defines direct link with deposition of surface and gas evolution in the face cleansing. In this paper we consider the influence of strike face speed subsidence at the surface and condition of the marginal zone of the reservoir.
On the basis of the experimental data received at erection mass of a file by throwing car with the bottom emission of breed, in the conditions of negative temperatures laws of distribution and a trajectory of flight of pieces of breed of the various sizes are established.
The necessity of development of new principles of approach to organization of degasification works at coal mines and directions of improvement of technological schemes at development of high-gas-bearing coal seams at great depths is grounded. The technological scheme of working out of a mining area with a direct flow ventilation scheme, with isolation of excavated space and protection of preparatory workings with cast strips from quick-hardening materials is offered.
An algorithm for selecting a mathematical model of the rock massif is presented. The finite difference method is used as a numerical solution method. The case of nonlinear rock deformation process is considered.
The modern coal mines work at great depths, characterized by high natural gas content of the massif, which increases the intensity of gas release at high rates of movement of the working faces. A brief review of the experience of operating coal mines at great depths is given. The main directions of improvement of technological schemes of mine working areas are proposed.
Based on the use of the special limit state condition, studies were conducted on the effect of moisture on the stratification of layered interbedded rocks for the case of overworked and then underworked interbedded rocks. The researchers paid insufficient attention to the effect of humidity on the stratification of interbedded rocks. As is known, the stratification of stratified rocks of the roof of mine workings significantly reduces their bending stiffness, which eventually leads to a significant increase in normal to the layering displacements of interlayered layers and the formation of limit zones. In this regard, prediction of the stratification of interbedded rock, with account of moisture, is important, as it is used in selecting the optimal parameters of the passports of mine workings, providing the necessary operational mode of mine workings, as well as in solving other important geomechanical problems.
Рассмотрены вопросы перспективного применения пневмобаллонной крепи в гибких технологических схемах отработки пластов многолетнемерзлых пород буровзрывным способом. Даны рекомендации по определению оптимальных параметров очистки забоев.
Разработка россыпных месторождений подземным способом в районах многолетнемерзлых пород осуществляется в большинстве случаев камерно-лавными системами разработки ...
