平顶山矿区煤层冲击倾向性指标及关联性分析

Outburst-proneness index and their correlation analysis of coal seams in Pingdingshan mine area

利用RMT-150B伺服试验机对平顶山矿区4组煤进行冲击倾向性试验。试验结果表明:煤的抗压强度、弹性模量越高,峰值前积蓄弹性应变能量越大,冲击能能量指数也明显偏大,动态破坏时间越短,发生冲击危险性越大;煤样的抗压强度与弹性模量呈良好的线性关系,抗压强度与冲击能量指数、弹性能量指数呈正相关,抗压强度与动态破坏时间呈负相关,两者采用幂函数表征;平顶山矿区丁8组煤层属中等偏强冲击类(Ⅱ类),己16-17组煤层属强冲击类(Ⅰ类),己15组和戊9-10组煤层属中等冲击类(Ⅱ类)。

The outburst-proneness of No. 4 coal seams in Pingdingshan mine area was tested by RMT-150B servo test machine. Test results show that coal seams with the higher of compressive strength and elastic modulus have the larger of accumulated elastic strain energy before peak and the impact energy index;coal seams with the shorter of dynamic failure time have more risk of outburst. There are good linear relationships between the compressive strength and elastic modulus, positive correlation between compressive strength and the index impact energy and elastic energy, negative correlation between compressive strength and dynamic failure time which can be characterized by power function. In Pingdingshan mine area, coal seam of DINGs belongs to medium to high outburst-proneness （class II）, JI16-17 has strong outburst-proneness（class I） ,JI15 and WU9-10 belong to medium outburst-proneness（class II）.