采动支承压力引起应变型冲击地压能量判据研究

采动支承压力引起的能量积聚及其突发释放是导致应变型冲击地压发生的根源之一。在将工作面前方煤体划分为阻力区、驱动区和无明显影响区的基础上，把应变型冲击地压从孕育到发生全过程分为能量稳定积聚、能量平衡和能量非稳定释放3个阶段，并研究其发生的基本条件；建立了采动支承压力引起应变型冲击地压的能量判据，即认为力学平衡状态破坏时驱动区煤体释放的弹性应变能与阻力区煤体完全破坏消耗能量的比值大于1。从冲击地压防治角度出发，提出了阻力区临界宽度的概念，建立了以阻力区宽度为指标的应变型冲击地压发生判据。现场实测表明，本文所建立的能量判据和指标与实测结果相吻合。其研究成果可为采动支承压力引起应变型冲击地压的预测预报和防冲、减冲工作的实施提供依据。

Energy criterion of abutment pressure induced strain-mode rockburst

The energy accumulation induced by abutment pressure and its burst release is one of the root causes of strain-mode rockburst. Firstly, the coal seam ahead of a coal face is divided into three zones, i.e., hindering zone, driving zone and unobvious influenced zone. The strain-mode rockburst from gestating to occurring is divided into three stages: energy steady accumulation, energy balance and energy unstable release. The basic condition of rockburst occurrence is discussed in detail, and then an energy criterion of abutment pressure induced strain-mode rockburst is established. Based on criterion, it is stated that the ratio of elastic strain energy released by the driving zone to energy consumed by hindering zone is higher than one when the mechanical equilibrium of coal and rock mass is destroyed. Secondly, a concept of critical width of the hindering zone is defined from the point of view of preventing rockburst, and an occurrence criterion of strain-mode rockburst is developed with a factor of the width of hindering zone. Finally, theoretical results and in-situ investigations show that both the energy criterion and the factors have reasonable accuracy and reliability in engineering application. This study can provide basis for forecasting strain-mode rockburst induced by abutment pressure and for implementing relevant preventive measures.