Abstract
Elevated bearing load pressure is formed near the exposed part of the coal seam, compared with static stresses normal to the reservoir. The loading of the near-bottom part of the coal seam is formed by linearly damped, according to the principle of Saint-Venant, from the bottom of the face to the massif of the tangential stresses from contact friction between the formation and lateral enclosing rocks in the form of a reference rock pressure, the epure of which is described by a convex quadratic function whose initial value is normal stress at the top of the bottom hole fracture, and the final stress is to the rock pressure in the zone of the intact massif. In connection with the above scientific position, a method has been developed for determining the vertical normal stress at the top of the bottom hole fracture, the length of the epure, and the distance from the bottom to the maximum of the reference pressure.
Highlights
In modern conditions, the solution of issues of rock pressure only by methods of mine observations and modeling by equivalent materials does not allow to reveal the mechanism of formation of the reference pressure.Since the second half of the last century, work has been carried out to control mountain pressure [1]
Its initial value is equal to the normal stress at the top of the bottom hole fracture, and the final value is to the mountain pressure in the zone of an intact massif corresponding to the experimental measurements
The basis of the methodology for developing a method for calculating epure parameters is the analytical determination of the vertical normal stress at the top of the bottom hole fracture, the length of the epure of the reference pressure
Summary
The solution of issues of rock pressure only by methods of mine observations and modeling by equivalent materials does not allow to reveal the mechanism of formation of the reference pressure.Since the second half of the last century, work has been carried out to control mountain pressure [1]. Rejecting all other approaches to the critical analysis of various theories based on the fact that they are described by ascending and descending exponents, while the real epures of rock pressure have the form of quadratic functions, А.А. Borisov, are reduced to three types of representation of the epure of rock pressure in the form: 1) a downward stress epure, characterized by its maximum value above the face; 2) one ascending and other descending exponent or exponential function of stresses intersecting at the point of the maximum value of the reference pressure
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