Table 4: Summary of statistics for the index and geomechanical parameters of the dacites in different weathering grades.

ParameterWeathering grade
IIIIIIIV

Unit weight (kN/m3)25.3–26.9 (25.9)24.4–26.1 (25.5)23.8–25.0 (24.4)23.3–23.8 (23.5)
Number of data156511910
P-wave velocity (m/s)3348.3–4680.1 (4045.9)2842.9–4164.6 (3628.8)2001.9–3238.7 (2775.5)1486.0–2142.2 (1910.3)
Number of data13652166
Tensile strength (MPa)5.1–13.0 (8.3)3.0–9.3 (5.5)1.0–4.8 (2.4)0.4–2.2 (1.5)
Number of data102362713
Block punch index (MPa)14.1–52.7 (27.1)12.2–34.6 (20.8)7.1–18.0 (11.6)4.2–13.0 (8.6)
Number of data160584219
Uniaxial compressive strength (MPa)71.0–204.2 (122.2)31.1–110.6 (73.4)22.8–60.6 (39.4)6.3–28.9 (15.8)
Number of data11452125
Porosity (%)5.1–12.0 (7.4)9.1–12.3 (10.8)10.2–15.9 (13.9)14.9–23.9 (19.6)
Number of data268620
Schmidt rebound value52.8–63.4 (58.0)47.0–52.6 (50.1)34.0–52.0 (42.0)17.4–38.0 (30.3)
Number of data60112124

Note. Numbers in the parentheses indicate the mean values.