Abstract
Coal and gas outburst is one of the main gas hazards in coal mines. However, due to the risks of the coal and gas outburst, the field test is difficult to complete. Therefore, an effective approach to studying the mechanism and development of outburst is to conduct the similar physical simulation. However, the similarity criteria and similar materials in outburst are the key factors which restrict the development of physical simulation. To solve those problems, this paper has established similarity criteria base on mechanics model, solid–fluid coupling model and energy model, and presented high similar materials. Combining with three groups of similar number, and considering similar mechanical parameters and deformation and failure regularity, the similarity criteria of outburst is determined on the basis of the energy model. According to those criteria, we put forward a similar material consists of pulverized coal, cement, sand, activated carbon, and water. The similar material has high compressive strength and the accordant characteristics with the raw coal, include density, porosity, adsorption, desorption. The new research is promising for preventing and controlling gas hazards in the future.
Highlights
Coal and gas outburst is an extremely complex gas dynamic phenomenon encountered in the production of underground coal mine and characterized by sudden eruption of a large amount of gas and coal from the coal tunnel or stope within a very short period of time (Lama and Saghafi 2002; Skoczyla 2012)
Combining with three groups of similar number, and considering similar mechanical parameters and deformation and failure regularity, the similarity criteria of outburst is determined on the basis of the energy model
This article will put forward similarity criteria which can describe the whole process of coal and gas outburst by using mechanics model, solid–fluid coupling model and energy model, and choose similar numbers by considering the current experiment conditions and the simulation requirement
Summary
Coal and gas outburst is an extremely complex gas dynamic phenomenon encountered in the production of underground coal mine and characterized by sudden eruption of a large amount of gas and coal from the coal tunnel or stope within a very short period of time (Lama and Saghafi 2002; Skoczyla 2012). In the researches of the additive phase, Ou formed coal samples with different physical and mechanical properties by controlling the mixture of pulverized coal and tar (Ou 2012). Wang resoundingly simulated gas seepage test in the similar materials using pulverized coal, cement, sand, activated carbon, which has a great boost to the development of similar material (Wang et al 2017). The similarity criteria and similar materials research have great help on the development of outburst physical simulation. This article will put forward similarity criteria which can describe the whole process of coal and gas outburst by using mechanics model, solid–fluid coupling model and energy model, and choose similar numbers by considering the current experiment conditions and the simulation requirement. Research results can help the theoretical and experimental development of outburst
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