Mechanical and gaseous properties of coal briquettes in terms of outburst risk

Coal-like material for coal and gas outburst simulation tests

“…The coal size in raw materials usually is less than 1 mm, and the pressing formed pressure is about 20-100 MPa [2,3,8,9,13,14,15,17,21,22]. Based on the results of similar materials preparation technology in coal and gas outburst simulation tests, in order to meet the needs of the large-size of coal and gas outburst simulation models, this experimental study on the coal-like material chooses crushed coal, cement, sand, activated carbon and water as raw materials (Table 1).…”

“…In 1959, Fami made 10 cm  10 cm  30 cm and 25 cm  200 cm  300 cm briquettes. In 2012, Skoczylas formed 48 mm diameter, length of 110 mm briquettes using fine coal [12], and in 2014, Skoczylas et al prepared coal briquettes of various porosity from 13.5% to 33%, and the coal briquettes have the similar mechanical and gaseous properties with normal and altered coal [13]. Meanwhile, researchers in China also prepared many similar materials to march the coal and gas outburst similar simulation tests.…”

Experimental study on permeability stress sensitivity of reconstituted granular coal with different lithotypes

“…Authors of this article suggest that reconstituted granular coal can be used as a research material to study porosity and permeability behavior of compacted coal fines filled in fractures. Reconstituted coal has already been used for studying coal sorption of CO 2 /CH 4 , swelling on permeability characteristics and compressive strength of altered coal [25][26][27][28][29]. The object of this paper was to investigate the stress sensitivity of compacted coal fines and lithotype influence on stress sensitivity based on porosity and permeability overburden pressure experiment on reconstituted coal.…”

Structurally Altered Hard Coal in the Areas of Tectonic Disturbances – An Initial Attempt at Classification

“…Researchers associated with the Strata Mechanics Research Institute has been dealing with issues related to the safety of coal mining, especially the various aspects related to gas hazards (including Wierzbicki, 2013;Skoczylas, 2012;Skoczylas et al, 2014). Gas-geodynamic hazards are, in turn, closely related to the structural and petrographic characteristics of coal, in particular the one from fault zones (including Młynarczuk & Wierzbicki, 2009;Godyń, 2011Godyń, , 2012Godyń, , 2013.…”