Deformation and Failure Mechanism of Roadway Sensitive to Stress Disturbance and Its Zonal Support Technology

Table 2

X-ray diffraction analysis of clay minerals.

Stratum	Clay minerals (%)			Mixed layer ratio (%)
	I/S	K	C	I/S
Roof mudstone	33	65	2	25

S: smectite, I: illite, K: kaolinite, C: chlorite, and I/S: illite/smectite mixed layer.