Deformation Mechanism and Support Technology of Deep and High-Stress Soft Rock Roadway

Table 5

Statistics of RQD in different rock type.

Rock type	N	Min.	Percentile (%)			Max.	Mean	Standard deviation
			25	50	75
Mineralization	26,601	0.090	17.62	33.06	51.87	100.00	36.93	24.08
Waste rock	28,789	0.025	20.00	35.70	53.00	100.00	37.66	21.85
All rocks	55390	0.025	18.8	34.4	52.5	100.00	37.31	22.94