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 gradeNumber of discontinuityMean discontinuity spacing (m)Discontinuity frequency (m)Standard deviationDistributionSHVRQD (%)

I1710.9691.030.769NE 5 4 < S H V 6 2 50–100
II1690.8261.210.853NE 4 0 < S H V 5 3 50–100
III1790.5081.970.388NE 3 0 < S H V 3 9 0–50
IV2310.4052.470.312NE 1 9 < S H V 2 9 0–50

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