Influence of Weathering on the Engineering Properties of Dacites in Northeastern Turkey

Table 1

Summary statistics for the discontinuity frequency and ranges of Schmidt rebound, and RQD (%) values of the dacites in different weathering grades (NE: negative exponential).

Weathering grade	Number of discontinuity	Mean discontinuity spacing (m)	Discontinuity frequency (m)	Standard deviation	Distribution	SHV	RQD (%)
I	171	0.969	1.03	0.769	NE	54<SHV≤62	50–100
II	169	0.826	1.21	0.853	NE	40<SHV≤53	50–100
III	179	0.508	1.97	0.388	NE	30<SHV≤39	0–50
IV	231	0.405	2.47	0.312	NE	19<SHV≤29	0–50

Level of significance for means of discontinuity spacing: 95%.