Research on Failure Characteristics and Zoning Control Technology of Thick-Soft Surrounding Rock for Deep Gob-Side Entry Retaining

Table 2

Index of rock disintegration resistance.

Specimen number	Rock name	Disintegration resistance index				Disintegration resistance classification
		Cycle 1	Cycle 2	Cycle 3	Cycle 4
1	Sandy mudstone	94.1	88.3	79.2	72.6	Medium
2	Mudstone	92.6	82.5	74.7	60.2	Medium