The invention discloses a rock field
shear strength test device and method, and which are suitable to be used in the field of rock detection. The rock field
shear strength test device comprises a shear test head, wherein a
shear stress loading pull rod is arranged at a
tail end of the shear test head; the shear test head is connected with a
servo oil pump which is arranged outside a step-shaped borehole through an oil circuit; a borehole orifice baffle plate, a
shear stress loading jack and a
shear stress loading jack locking nut are arranged at a
tail end of the shear stress loading pull rod in sequence; the shear stress loading jack and the borehole orifice baffle plate are extruded and fixed on a rock at a borehole orifice; a
shear displacement test device is arranged between the
tail end of the shear stress loading pull rod and the borehole orifice baffle plate; the
servo moil pump and the
shear displacement test device are connected with a stress-displacement data collection and display
system through circuits.
Shear force is applied to the borehole by the shear test head, and the
cohesive strength and the
internal friction angle of a tested object are obtained by regression fitting according to a Mohr-
coulomb yielding criterion. The rock field
shear strength test device has a simple structure, is accurate in tests, and can be used for monitoring a displacement value all the time in a pulling process.