Rock mass site direct shear test method adopting anchoring pressure

The invention discloses a rock mass site direct shear test method adopting anchoring pressure. The method is realized in the following manner: an anchor cable is preset in a test piece, during testing, a hollow jack or prestress tension equipment is adopted to exert normal pressure on a shearing surface required for testing on the test piece, and the moving condition of the test piece is provided through utilizing the transverse flexibility of the anchor cable and the section clearance of a drill hole. Compared with the common site direct shear test method, the method has the advantages of compact testing system, small occupied site, simple testing equipment, high convenience in mounting, low cost, short construction period, and the like.