Abstract
In this study, a multi-physics coal and gas outburst experimental apparatus is developed to allow investigating the gas-driven mechanism behind the disaster caused by coal and gas outbursts in tectonic regions. The apparatus can simulate the coal and gas outbursts under different initial geo-stresses, gas pressures and temperatures. By integrating acoustic emission sensors in the holes on axial platens, acoustic signals from coal samples during the whole test can be monitored. A series of testability experiments were conducted on the developed apparatus to verify its performance. The damage characteristics and outburst occurrence of raw coal under different gas pressures were experimentally studied and that provided a more complete theoretical basis for coal and gas outburst. The degree of fragmentation of coal samples and the mass proportion distributions of the outburst pulverized coal after outbursts under different gas pressures were analyzed, as a reference for exploring the evolutionary characteristics of coal and gas outburst with gas-driven action.
Highlights
Coal and gas outburst (CGB) is one of the biggest threats to mine safety and coal production
Effect of Gas Pressure on the Coal Destruction Most of experimental simulation apparatuses for CGBs have a horizontal layout (Yin et al, 2016; Ding and Yue, 2018; Wang et al, 2018; Zhou et al, 2019b), since the roadways where the CGB disasters happen frequently are always arranged along the strike direction of the coal seam, normally horizontal/near-horizontal
Considering that the post-outburst has been well studied, the new-developed apparatus is focused on the gas-driven effect on the CGBs and designed with a vertical layout, which means that the outburst will propagate upwards
Summary
Coal and gas outburst (CGB) is one of the biggest threats to mine safety and coal production. It is reported officially that coal as the most important primary energy source in China, will maintain a huge production of more than 3 billion tones in the 30 years. A high geo-stress can destroys the coal seam which will make coal fragmentation easier and even lead to a CGB accident under the action of highpressure gas accumulated within the coal mass (Liu et al, 2014; Li et al, 2018; Zhou et al, 2019a). Aside from the mechanical properties of coal, a sufficient amount of “free” high-pressure gas is considered to be a primary initial condition for CGBs occurrence (Cao et al, 2019)
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