Influence of Cyclic Impact Loading and Axial Stress on Dynamic Mechanical Properties of Burst-Prone Coal

Table 2

Analysis of coal specimens through the XRD method.

Coal source		No. 2 coal seam of Qianqiu mine		No. 7 coal seam of Zhaogezhuang mine
Serial number		QQ-1	QQ-2	ZGZ-1	ZGZ-2
Depth (m)		−1060	−1060	−1100	−1100
Properties		Burst-prone	Burst-prone	Burst-resistant	Burst-resistant
Mineral type and content (%)	Quartz	1.5	0.8
	Calcite			1.1	1.2
	Dolomite		1.2
	Siderite	1.6	1.1
	Halite			0.9
	Amorphous	90.8	90.9	90.2	91.3
Clay mineral content (%)		6.1	6.0	7.8	7.5

Note: QQ represents Qianqiu mine and ZGZ signifies Zhaogezhuang mine.