Correlation between rockburst and regional tectonic stress environment and its strain response characteristics

In order to ascertain the coordination mechanism between the source structure of rockburst and the tectonic stress environment, a borehole strain observation system was established specifically for rockburst in Huating mine, and the strain responses of large-scale rockburst events in the mining area and several natural earthquakes occurred recently were successfully observed.The observation results indicate that the stratum scale involved in the preparation and triggering process of tectonic rockburst events on a large scale is larger than the influence scope caused by traditional working site and mining.There are two borehole strain response patterns of “step” and “oscillation” caused by rockburst in the surrounding areas.While the scale or distance of observation point from rockburst source is different, the borehole strain response model is different.There is a related “chain” mechanism between rockburst source and relevant area, which is similar to the observations resulting from natural earthquake.The results preliminarily verify the feasibility of making observation of regional stress or strain effect of mining disturbance to explore the rockburst inoculation mechanism.