ABSTRACT
In the following article describes a method for calculating of the minimum pressure of hydro breaking of the coal seam. The method is based on the theory of cracks. It is assumed that the development gets an extreme crack in the top of which shear stress reach the maximum value. At determining the maximum value of shear stress we taken into account the hydraulic pressure of liquid, that operates on the inside of crack face, the vertical rock pressure effect, frictional force, the horizontal stress of backwater, the damping contact shear stresses from contact formation zones. Derive a set of equations to determine the minimum hydraulic pressure of hydro breaking of coal layer.
