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

Table 1

The proportion of mineral components in rocks.

Lithology	Nontronite/%	Illite/%	Kaolinite/%	Quartz/%	Montmorillonite/%	Other minerals/%
Sandy mudstone	8.93	19.32	20.24	31.70	11.90	7.91
Mudstone	4.69	21.68	27.20	23.30	18.43	4.70