Mining Institute, Ural Branch, Russian Academy of Sciences:

N. A. Litvinovskaya, nlitovskaya@mail.ru

Perm National Research Polytechnic University:

S. S. Andreiko, rmpi@pstu.ru

In the paper the analysis of problems of gas-dynamic phenomena in salt underworked rock massif. The results of simulation of stress–strain state in the vicinity of excavation with a gas hearth in the soil. Geomechanical modeling was carried out for four variants of a design scheme based on the boundary element method (the method of fictitious loads) in linear–elastic statement: single output with gas concentration in the soil in terms of hydrostatics and in the conditions of part-time work; connect two workings with a gas accumulation in the soil in terms of hydrostatics and in terms of conditioning. For each option in the simulation varied the gas pressure in the hearth and the calculation results were evaluated a minimum critical pressure, in which the possible destruction of rocks of soil of development, which is a necessary condition for the development of gas-dynamic phenomena in the form of sudden breaking of rock soil, accompanied by gassing. To solve the problem about stress–strain state of a piecewise homogeneous three-dimensional elastic medium was used specially developed mathematical algorithm for solving three-dimensional nonhomogeneous elastic problems indirect boundary element method. The possibility of sudden breaking of rock soil development and the pairing of the two roadways was estimated according to the criterion of Coulomb, and also under existing tensile stresses. For each alternative design scheme the estimation of the minimum critical pressure in picantinny accumulations of free gases, the possible sudden collapse of rocks of soil of development, accompanied by gassing. For safe penetration of preparatory workings in rock salt underworked array suggested the use of preventive drilling of degassing holes in the soil.

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