不同位移加载速率下突出煤的红外辐射温度变化规律

为了探究不同位移加载速率下突出煤煤体失稳破坏的红外前兆信息,以0. 02 mm/s、0. 01mm/s、0. 005mm/s三种位移加载速率施加载荷,开展平煤十二矿和新景矿突出煤体加载破坏过程中红外辐射规律试验。试验结果表明:不同位移加载速率下煤样产生变温现象,低速位移加载速率时,煤样温度增加幅度变大,相同位移加载速率下,新景矿突出煤试样比平煤十二矿的红外辐射温度变化大;平煤十二矿和新景矿突出煤试样加载产生红外辐射的物理机制一致,均存在热弹效应和摩擦热效应;平煤十二矿突出煤试样破裂失稳红外辐射前兆表现为台阶式上升趋势,而新景矿突出煤试样表现为阶跃式、突增型上升趋势。

Infrared radiation temperature variation pattern of outburst coal under different displacement loading rates

In order to explore the infra-red precursory information of outburst coal body instability failure under different displacement loading rates, the infrared radiation pattern experiment was carried out in Pingmei No. 12 coal mine and Xinjing coal mine during the process of outburst coal mass failure by applying load at 0. 02mm/s, 0. 01mm/s and 0. 005mm/s displacement loading rates, respectively. Experimental results show that under different displacement loading rates, coal sample has variable temperature phenomenon. When loading is at low displacement loading rate, coal sample temperature increase amplitude becomes larger;when at the same displacement loading rate, Xinjing coal outburst coal sample has greater change in infrared radiation temperature than that in Pingmei No. 12 coal mine. The physical mechanism of infrared radiation generated by the loading of outburst coal samples from Pingmei No. 12 mine and Xinjing mine is consistent, and there are thermo-elastic effect and frictional thermal effect. The precursory infrared radiation of outburst coal samples from Pingmei No. 12 mine has a stepwise upward trend, while the outburst coal sample from Xinjing coal mine shows a stepwise and sudden increase trend.