NUMERICAL SIMULATION OF MECHANICAL AND SEISMIC EFFECTS OF EXPLOSION AT GREAT DEPTH

Abstract

The article presents the results of calculations of the mechanical and seismic effects of underground nuclear explosions carried out at a depth of more than a kilometer. A comparison is made of the modeling results, carried out taking into account the action of lithostatic pressure, with the data of recording the parameters of seismic explosion waves during known experiments on the island Amchitka (USA) «Cannikin» (explosion depth H = 1791 m) and «Milrow» (H = 1219 m). In addition, calculations were made of the maximum values of the relative coefficient of change in the permeability of the rock mass in the near zone of the explosion. It is shown that the methods used in the numerical modeling of the mechanical and seismic action of an explosion satisfactorily describe the parameters of seismic waves and the configuration of the zone of material destroyed by the explosion. At the same time, the calculation results do not provide quantitative information about the degree of damage to the massif and changes in its integral properties. However, the use of previously established correlation dependencies makes it possible to evaluate such properties as post-explosion permeability, seismic waves propagation velocities, apertures of fractures opening, etc. The results of such estimates can be used as input data when modeling a number of physical problems.