Pasichnyk A. Rationale seismic stability of rock mass with cavities seasonally adjusted blasting in quarries

Thesis is devoted to the solution of scientific problems on the justification conditions of seismic stability of rock mass with cavities and positioned thereon protected objects that constantly affect seismic waves generated by industrial explosions. Based on the ray method, mathematical models of the P- and S-waves interaction with a spherical cavity have being developed. For computer equipment designed and implemented an algorithm for determining the dynamic loads on the perimeter of the spherical cavity of seismic-shock waves that incident on the interface. To determine the sustainability of protected objects above the voids in the rock mass, the criterion of evaluation of static and dynamic loads the joint action on the cavity, taking into account the impact of the cavity wall self-weight, the mass of the protected object, and seismic-shock-waves propagating in a medium. Regularities change of stresses in the rock mass around the cavity depending on the coordinate on the surface, the depth of the cavity, the mass of an object disposed over the cavity, the angle of the wave front at the cavity incidence, the Poisson's ratio and the rock density. Determine the cumulative voltage at the interface during cavity filling with air or water. First experimentally established regularities of changes in the speed of the ground motion caused by moisture in different seasons that allows adjusting parameters of blasting in the seasonality of their carry out. Based on the research, proposed method of the safe blasting parameters determining and developed recommendations for the implementation seism safe blasting parameters of explosives during the industrial explosions in Ukraine quarries.