Study on the Microscale Tensile Properties of Lower Cambrian Niutitang Formation Shale Based on Digital Images

Table 1

Material parameters of shale micromedia [39].

Material	Elastic modulus/GPa	Uniaxial tensile strength/MPa	Pressure rabbi	Poisson’s ration	Frictional angle λ(°)
Shale	51.6	11.67	14	0.22	35
Calcite	80.5	9.00	11	0.30	30
Quartz	96.0	14.00	15	0.08	60