Monitoring and modelling stress state near major geological structures in an underground coal mine for coal burst assessment

摘要

Stress states and geotechnical conditions often change significantly near major geological structures (e.g. faults, shear zones, dykes) which is the cause of most major mine instabilities and/or safety hazards including coal burst, roof falls, water inrush, gas outburst, etc. In order to understand and quantify the stress state near major geological structures, an integrated study had been conducted, which included a comprehensive field monitoring program in the vicinity of a dyke in an Australian underground coal mine; detailed analysis of monitoring data to identify the stress anomalies near the dyke; and three-dimensional numerical modelling to investigate the stress distribution and the strain energy concentrations for the purpose of coal burst risk assessment.