Experimental and Numerical Investigation on Hydraulic Fracture Propagation Law of Composite Rock Materials considering the Disturbing Stress Effect

Table 1

Physical and mechanical parameters of the cement mortar.

Porosity (%)	Permeability (mD)	Uniaxial compressive strength (MPa)	Modulus of elasticity (GPa)	Tensile strength (MPa)	Cohesion (MPa)	Angle of internal friction (°)	Fracture toughness (N·mm^3/2)
13.79	1.13	15.85	0.92	1.65	0.30	31.29	13.23