Constant Resistance and Yielding Support Technology for Large Deformations of Surrounding Rocks in the Minxian Tunnel

Table 2

Mineral composition and relative content of carbonaceous slate.

No.	Relative mineral content (%)
	Quartz	Illite	Chlorite	Ankerite	Kaolinite	Potassium feldspar	Siderite	Halite
1/5	59.6	27.32	9.9		2.38			0.9
2/5	35.2	36.72	21.42		3.06	2.2		1.4
3/5	65.2	12.28	6.32	14.4			1.1	0.8
4/5	71.6	6.16	16.64	4.6				0.9
5/5	85	9.3	5.7