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Abstract An in situ rock masses triaxial test system YXSW–12 was manufactured by the Yangtze River Scientific Research Institute and Chaoyang Test Instruments Co.，Ltd.. The test system had the following advantages：(1) The real triaxial test could be carried out. (2) The surrounding pressure could achieve 15 MPa；and the axial pressure could achieve 80 MPa. (3) The sample size was 50 cm×50 cm×100 cm，which could express the mechanical characteristic of large scale rock. (4) The complex stress routes could be servo-controlled. (5) The whole curve of deforming and breaking processes could be got，and the deformation and strength parameters in one single test could be obtained. The YXSW–12 test system was used to test the mechanical properties of column jointed rock masses，and got excellent results. The test results were shown as follows：(1) The anisotropic deformation parameters under different loading conditions were obtained. (2) The peak strength and yield strength of original simples were obtained by unloading test. The residual strengths of disturbed samples were obtained by loading and unloading test. The differences of strength parameters with different kinds were compared and analyzed. (3) The break mechanism of field rock masses was researched. The test results indicated that the breaking surface was mainly originated from the column joints. The YXSW-12 test system provides a new means for engineers to find out the deformation，strength and breaking properties of deep and complicated rock masses.
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Received: 02 April 2011
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2011, Vol. 30 
