Rock cohesive force and internal friction angle testing device and method

The invention discloses a rock cohesive force and internal friction angle testing device and method, and belongs to the technical field of rock indoor shear tests. The device comprises a ball bearingplate, an upper shearing box, a lower shearing box and a shearing head. When the device works, a rock indoor direct shearing instrument needs to be matched to complete testing work. When the cohesiveforce and the internal friction angle of the rock are tested, firstly, the rock test piece manufacturing device is used for processing the rock into a standard rock test piece; then the method includes applying a normal force P to a preset value through a direct shear apparatus, then applying a tangential force Q until obvious displacement is generated, and adjusting the normal force P and the tangential force Q to repeat the operation; and finally, fitting according to experimental data to obtain a strength curve of the rock subjected to shear failure so as to obtain the cohesive force and the internal friction angle