| Proper determination of rock mass physical and mechanical parameter is a fundamental task in slope engineering, directly influencing its safe and economic efficiency.On the basis of analyzing and disposing vast amount of experimental data, the present thesis systematically studies the computing method of rock mass mechanical parameters, taking a random slope of New-built changsha-kunming railway as an object of study.The main contents of the study are as follows:(1) Developing of abundant laboratory rock tests and in situ direct shear tests, which provide direct reference evidence for the present rock mass parameters, and establish the base for further analysis. It can be found that during the test, the big errors of shear strength parameters of rock discontinuity planes and rock mass mechanical parameter both present owing to variety factors, so they can not be applied directly in engineering practice.(2) Systematic researching of Barton formula, RMR, and Hoke-Brown criterion on the basis of previewing numerous previous criterions, and estimating the rock mass mechanical parameter of the present area by the criterions mentioned above.(3) Providing the constitutive equation of structural plane’s characters of the present area, and Simulating direct shear test for discontinuity planes and triaxial test by computer, and achieving excellent effect, which suggest that the method of numerical experiment is practical.(4) Detailed discussion of the method of achieving rock mass mechanical parameter by applying the three criterions to analyzing the stability of the particular slope, which declares that for linear railroad engineering, when larger scaled tests are not applicable, it is practical to determine the rock mass mechanical parameter according to a certain quantity of laboratory tests with estimating and numerical experimentation, etc. |
