The article sets out a comprehensive approach to the reconstruction of stress fields in rocks at any stage of coal mining. The approach involves laboratory testing of coal in order to find an empirical dependence of Vp on stresses; coal seam tomography, taking impulses generated by dynamic events as the sounding signals; and statement and solving of inverse problem in the framework of a geomechanical model of an object under consideration where the input data is the velocity field reconstructed in the illuminated part of coal seam by tomography.
The laboratory data of the coal specimens subjected to ultrasonic sounding in the course of triaxial compression is fitted to obtain the relationship between Vpand mean normal stress.
The numerical experiments carried out for a typical underground layout at coal producer have shown that, given that the spread arrangement is approved in the mine, the single-valued solution of the inverse problem requires good illumination of coal seam areas with the spatial stress gradient.
The procedure for the joint analysis of stochastic and deterministic information allows quantitative relationships to be established between the parameters of various physical fields developed and tested in terms of an iron ore deposit. Based on the statistical analysis of induced seismicity and variation of stress tensor components in the rock mass, the proposed approach makes it possible to relate the variation in the integral characteristics of the stress field and the number of seismic events in different parts of an object. This provides a way to predict the induced seismicity parameters in the course of mining.