Slashchov A. Validation of Parameters and Designing of Information Safety Systems for Underground Mining Operations with Taking into Account Geomechanical Factors

The objective of the thesis is to validate information safety system parameters for underground mining operations basing on established common tendency of changing scenarios of geomechanical process dynamics and criteria for estimating geomechanical process danger. It is for the first time when ratios of (a) the tunnel contour shifting to the support flexibility and (b) volume of the broken rocks in zone with inelastic deformation to the support bearing capacity are used for criterion estimation of the "support-rock" system state. The criteria were established on the basis of a mathematical model which took into consideration data spread of the compressive and tensile strengths, coefficients of elasticity and shearing, angels of internal friction in each layer of the rocks, size of the rock outcrop and quantity of all broken elements in the medium in result of deformation at different methods of the tunnel supporting and increasing levels of the rock pressure. It was found that geomechanical safety of the tunnel was inversely to the tunnel geometry, contour shifting and weight of the broken roof rocks and in direct proportion to the support flexibility and bearing capacity. In order to estimate parameters for the current geomechanical monitoring of the "support-rock" system, two integral indices of safety shall be formed, one of them shall specify maximal level of technical danger and another shall reflect integral technical danger of the geotechnical system. The first index is used to control transfer of the control object to the emergency mode, and the second index is used to estimate the current state. A fuzzy controller was designed and tested for analyzing monitoring data by size and speed of the parameter divergence. Parameters were validated, and architecture of the new information safety system was designed which differed by methods of on-line forecasting and estimating of scenarios of geomechanical process dynamics. The system includes: a basic client-server subsystem for personnel management; a reference-information subsystem; and a subsystem for analyzing safety of mining operations and geomechanical factors by methods of estimation of the "support-rock" system safety basing on the safety criteria and mathematic apparatus of fuzzy logic. Safety of operations is ensured by more effective personnel interaction, the personnel stronger disciplinary responsibility, and, basing on specified size and speed of the parameters changing, earlier made decisions on keeping the tunnels in a trouble-free state. The findings of the thesis were used for designing, testing and implementation of technical recommendations and the new information safety system.