考虑动静载加载的含瓦斯煤突出试验系统与应用

Experimental system for coal and gas outbursts and its application under static and dynamic loads

为研究深部开采条件下的复杂应力环境中煤层受动态载荷扰动发生煤岩动力灾害的过程和机理,在同类模拟突出设备基础上研制了动静载条件下的煤与瓦斯突出模拟实验设备。该实验装置包括煤样室、突出口装置、加载系统和计量系统。该实验设备能较好地模拟静态载荷和动态载荷共同作用下的突出现象,还可进行瓦斯吸附条件下的动静载突出实验,深入研究瓦斯吸附量对突出的影响。研究结果表明,在相同的动态载荷作用下,无瓦斯解吸过程比有瓦斯解吸过程更容易发生突出;无煤柱影响比有煤柱影响更容易发生突出,并且无煤柱影响的突出强度比有煤柱影响的要大。

In order to study the process and mechanism of coal and gas outbursts caused by dynamic loads incomplex stress environment of deep mining condition, coal and gas outbursts simulation equipment under static and dynamic loads is developed based on the similar outbursts simulation devices proposed before. The test device is composed of a coal sample room, an outlet unit, a loading system and a measuring system used to investigate the properties of gas adsorption and desorption, seepage characteristics under the condition of static and dynamic loads. This experimental facility can be used to simulate the phenomenon of coal and gas outburst under the coupling action of static and dynamic loads. The results show that there is more liability of coal and gas outburst induced by non-gas desorption and non-coal pillar than that by gas desorption and coal pillar under a same impact load. And the outburst strength of noncoal pillar is bigger than that of coal pillar. According to the characteristics of the facility, a new formula of evaluating the outburst strength is proposed finally, which may provide a new way to estimate the energy range of coal and gas outburst in the future.