Добыча полезных ископаемых открытым способом в СССР непрерывно растет. В 1975 г. карьерная добыча угля по сравнению с 1970 г. возрастет на 52,2—55,2 млн. т и составит 205,5—208,5 млн. г, или 30% от общего объема добычи угля по стране. В 1980 и 2000 г. долевое участие открытой угледобычи будет составлять, соответственно, 40—45 и около 70% от всей добычи угля по СССР ...
When designing the standards for the consumption of timber for coal mining, it is especially important to correctly determine the consumption of timber for the lining of workings, which is from 50 to 70% of the total timber consumption for coal mining. The purpose of this work is to attempt to provide a method for the theoretical determination of the required density of lining of working faces based on the theory of limiting and equivalent spans developed by V.D. Slesarev. In accordance with this goal, the first two paragraphs of the work provide a brief exposition of the theory of limiting and equivalent spans according to V.D. Slesarev; § 3 provides an application of this theory to the issue of determining the magnitude of rock pressure on the lining of workings with a constant width; § 4 presents the method of successive approximations proposed by the author for calculating the expected pressure on the lining of working faces; § 5 provides a formula for determining the required density of lining of a working face; § 6 provides the results of calculating the pressure according to the proposed method for a specific case of practice—the 1st eastern face at Mine B in the Donetsk Basin.
This article is devoted to the assessment of the impact of the cost of hauling minerals along floor crosscuts on the most advantageous longwall dimensions of the mine field of a vertical shaft opening a suite of steeply dipping seams, determined by the method of L. D. Shevyakov. The cost of hauling minerals along crosscuts during the development of a suite of steeply dipping seams by a vertical shaft with floor crosscuts increases with the increase in the number of floors in the mine field and decreases the most advantageous number of floors against the values given by L. D. Shevyakov's formulas derived without taking this factor into account. In exceptional cases (location of the mine outside the suite with a small angle of dip of the seams), the number of floors determined without taking into account the cost of transport along floor crosscuts may exceed their most advantageous number by 50% or more.
The condition of the problem, the solution of which is the goal of this work, can be formulated as follows: based on a given law of distribution of mineral reserves along a curvilinear underground haulage working and the location on the surface of the point to which the entire reserve of mineral should be transported, find a point on this working such that, with the location of a vertical lifting shaft in which the total cost of underground and surface transport of minerals would be minimal.
