ROCK TRIAXIAL DIRECT SHEAR TEST APPARATUS AND METHOD

摘要

A rock triaxial direct shear test apparatus and method. Said apparatus comprises confining pressure balance shearing mechanisms and a soft sample sealing sleeve (1); the confining pressure balance shearing mechanisms are fixed at two ends of a sample (2), and the soft sample sealing sleeve (1) is sleeved outside the sample (2) and the confining pressure balance shearing mechanisms at the two ends thereof; the confining pressure balance shearing mechanisms each comprise a shearing base (3), the shearing base (3) is in contact with one side of an end portion of the sample (2), a chamber is formed between the shearing base (3), the other side of the end portion of the sample (2) and the soft sample sealing sleeve (1), an elastic cavity body adapted to the shape of the chamber is provided in the chamber, the shearing base (3) is provided with a balance conduit, one end of the balance conduit is in communication with a cavity inside the elastic cavity body, the other end of the balance conduit is in communication with the outside of the soft sample sealing sleeve (1), and the two confining pressure balance shearing mechanisms are oppositely arranged. By applying self-balancing confining pressure to the outer periphery and end portions of the sample (2) and conducting a shear test on the sample (2), an evaluation test on the shear mechanical behavior of deep engineering rock mass is realized, and the experimental error is reduced.