红砂岩三轴压缩变形与强度特征的试验研究

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Abstract Characters of failure，strength and deformation for red sandstone are analyzed with uniaxial compression，conventional triaxial compression and Brazil split tests by using RMT–150B rock mechanics test system. Five conventional triaxial strength criteria are fitted to the test data with least absolute deviation，and the predicted values of uniaxial compressive strength，tensile strength and fracture angle are compared to the test ones. Results show that the Mohr-Coulomb criterion presents large misfit which overestimates strengths at low and high confining pressures. The Hoek-Brown criterion，generalized Hoek-Brown criterion，Rocker criterion and the exponential strength criterion present uniaxial compressive strength just the same with experimental value of 68.0 MPa，but partial higher in tensile strength estimation. The value of prediction in generalized Hoek-Brown criterion is most closed to calculations of tensile strength and the fitting effect is better. Fracture angles of red sandstone are 52.5°–66.6° in test，which correlated with confining pressure negatively. Prediction of fracture angle in Mohr-Coulomb criterion is 65° which is larger than the actual one. The fracture angles predicted by other four criteria decrease with the increase of confining pressure and correspond with the test results.

Key words： rock mechanics red sandstone conventional triaxial compression strength criterion fracture angles

Received: 14 August 2012

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/Isl/3164

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