Experimental Investigation of the Permeability Measurement of Radial Flow through a Single Rough Fracture under Shearing Action

Table 1

Main technical parameters of the normal force and shear force electrohydraulic servo systems.

	Vertical force electrohydraulic servocontrol	Horizontal force electrohydraulic servocontrol
Maximal testing force	700 kN
Effective measurement range of the testing force	20–80% F.S
Indicating accuracy of the testing force	±1%
Resolution of the testing force	1/200,000
Displacement piston formation (force measured by a radial load sensor)	≥200 mm	≥100 mm
Measuring range of the displacement	0–200 mm	0–100 mm
Discrimination of the displacement	0.025 (5,000 yards)
Indicating accuracy of the displacement	<±5% F.S
Measuring range of the deformation	0–100 mm
Indicating accuracy of the deformation	±5%