Rock type
Dry density /(g·cm-3 Natural water content/% Void ratio /%
Uniaxial compressive strength (MPa)
Uniaxial compressive strength (MPa)
Dry Natural
Mudstone 2.32 6.7 9.2 14.2~20.8 12.5~14.9
Sandstone 2.59 2.2 13.5 16.4~25.8 15.2~23.3