Sample
(or material)

Sample

Apparent volumetric mass

Single values
(kg/m^3)

Average value
(kg/m^3)

Sample (I):

porphyry

Location:

Trentino

Rocktype:

porphyric quartzite

Orientation of possible planes of discontinuity or schistocity with respect to the direction of load DRY SAMPLES

Sample
(or material)

Sample
number

Dimensions

Breaking load
P(kN)

Resistance to mono-axial compression
C₀(MPa)*

L
(mm)

A
(mm)

B
(mm)

1

71.7

70.5

69.7

1091

222.0

2

69.5

71.0

71.0

942

186.9

3

67.0

72.0

71.0

1114

217.9

4

69.5

69.5

70.0

1261

259.2

Average result of 4 samples Com = 221.5 MPa

* 1 MPa = 10.2 Kgf/cm^2