TUNNEL SURROUNDING ROCK SUPPORT STRENGTH TEST APPARATUS AND STRENGTH DETERMINATION METHOD

摘要

A tunnel surrounding rock support strength test apparatus and a strength determination method, the test apparatus comprising: a bearing frame unit (1), comprising a base (11), vertical columns (12) and a horizontal beam (13), the vertical columns (12) being vertically arranged at two sides of an upper surface of the base (11), the horizontal beam (13) being horizontally fixed at upper portions of the vertical columns (12); an axial pressure loading unit (2), fixed at a middle position of the upper surface of the base (11), and used for applying vertical axial pressure to a test piece (8); an impact loading unit (3), fixed on the horizontal beam (13), and used for applying a vertical axial impact load to the test piece (8); a confining pressure loading unit (4), arranged between the axial pressure loading unit (2) and the impact loading unit (3), and used for applying horizontal confining pressure to the test piece (8). The test apparatus also comprises a loading control unit (5), a monitoring unit (6) and a data analysis unit (7). Tunnel surrounding rock actual static load stress size and dynamic load impact characteristics are used for loading stresses, so as to be better matched with on-site tunnel surrounding rock actual stress states. Obtained support strengths can better ensure surrounding rock safety and stability, the accuracy is high, and the test operations are simple and convenient.