瓦斯压力对煤样冲击倾向性的影响试验研究

以深部高瓦斯矿井复合动力灾害为研究背景，以瓦斯压力对煤样的冲击倾向性的影响为研究目的，以RMT-150C型岩石力学试验机为载体，研发含瓦斯煤岩单轴压缩条件下受载变形破坏实验装置，并结合XL2101C程控静态电阻应变仪组成含瓦斯煤单轴压缩实验系统，进行含瓦斯煤的冲击倾向性指标测定试验。试验结果表明:煤样在充气过程和吸附瓦斯过程均存在扩容现象，煤样体积随瓦斯压力的增大而增加，吸附过程煤样体积变化分为两个阶段:加速变形阶段和平缓阶段;随着瓦斯压力从0增加到2 MPa，煤样的动态破坏时间增加547.64%，煤样的弹性能量指数、冲击能量指数和单轴抗压强度分别降低85.29%,96.24%和58.78%，综合评价结果为冲击倾向性降低。

Experimental study on the effect of outburst-proneness of coal by gas pressure

In terms of compound dynamic disaster in depth high-gas mine,in order to investigate the influence rule of coal and rock mechanical behavior by gas pressure,a set of experimental equipment for testing coal samples deformation and failure under uniaxial compression condition of coal and rock containing gas was developed with the RMT-150C rock mechanics test system as a carrier,and then,constituted a gassy coal uniaxial compression experiment system with XL2101C SPC static resistance strain gauge.Outburst-proneness index determination tests were conducted on this system.The results showed that ① the volume-expanding phenomena of coal samples occur with the increase of gas pressure during the process of gas filling and adsorption.The volume change of coal samples is divided into two stages:the accelerated deformation stage and the gentle stage;② with the increase of gas pressure from 0 MPa to 2 MPa,the dynamic failure time of coal samples decreases by 547.64%,the elastic energy index,impacting energy index and compressive strength of coal samples decrease 85.29%,96.24% and 58.78% respectively.The comprehensive evaluation result is a decrease in impact tendency.