采动支承压力引起应变型冲击地压能量判据研究

hat the build-up of energy induced by abutment pressure and its non-stable release is one of the root causes of strain-mode rockburst. At first, the coal seam ahead of coal face was divided into hindering zone, driving zone and no effect zone based on the distribution of abutment pressure. The three stages of strain-mode rockburst from gestating to its occurrence, energy steady build-up, energy balance and energy non-stable release, were proposed, and prerequisites for developing to the stage of energy non-stable release were revealed. Later, the energy criterion of abutment pressure induced strain-mode rockburst was built, which is that the ratio of elastic strain energy released by driving zone to energy consumed by hindering zone is larger than one when the mechanical equilibrium of coal and rock mass is destroyed. Then, the critical width of hindering zone was proposed, and the width of hindering zone was used as a factor on whether strain-mode rockburst is able to occur or not. At last, results of theoretical calculations and in-situ investigations showed that both the energy criterion and the factor have reasonable accuracy and reliability in engineering application. This research can help to forecast abutment pressure induced strain-mode rockburst as well as provide basis for the implementation of preventive measures.