A Study of Acoustic Emission and Damage Evolution of Limestone under Different Stress Paths and Confining Pressures

Table 1

Mining forms and slope structure conditions of some mines in mountainous areas of Guizhou.

	Faer mine	Lvtang mine	Yongsheng mine	Qingshan mine	Zuojiaying mine	Daqing mine	Guobao mine
Location	Liupanshui city	Bijie city	Bijie city	Duyun city	Bijie city	Bijie city	Xingren county
Depth of coal seams (m)	300~1020	220~1000	200~1000	160~900	280~1100	400~1050	600~1000
Coal seam plunge (°)	10	10	8	10	12	12	8
Average thickness of coal seams (m)	2.8	1.99	2.65	3.6	1.7	2.35	1.59
Direct roof lithology	Mudstone	Siltstone	Limestone	Sandstone	Limestone	Pelitic siltstone	Limestone, marlstone
Indirect roof lithology	Pelitic siltstone	Packsand, limestone	Limestone	Macker	Limestone	Limestone	Limestone
Coal mining method	Longwall mining method