Study Of Effects Of Structural Planes On Rock Mechanical Properties Based On Field Test And Numerical Simulation

Determination of the mechanics parameters of rock mass reasonably is an important research topic in the field of rock mechanics and engineering construction.Rock mechanics parameters are not only related to Non-continuity, non-uniformity,anisotropy and structural feature of rock mass,also closely related to occurrence environment of rock mass.In this paper,numerical analysis method is used to study the effect of the structural characteristics,stress state to the deformation modulus and shear strength parameters of rock mass and an nisotropy and size effect of mechanical parameters of rock mass.The principal contents are summarized as follows:(1)Specific to problems existing in domestic and overseas mechanical parameters values of rock mass, influences of morphological characteristics and stress state of rock mass structure and other factors upon mechanical parameters values of rock mass are studied through numerical simulation. Based on current test method for rock mass mechanics and the results of direct shear test on a large hydropower station field structure, structural surface direct shear test numerical model is established and the feasibility is identified, the results of mass shear numerical experimentation are analyzed and effect laws of structural surface gap and changes of persistence ration upon rock mass’ s equivalent strength parameters.(2)The feasibility of rock mass bearing plate deformation test numerical model of rock mass containing structural surfaces is identified, influences of structural surface gap, dip angle and initial stress state and size effect upon rock mass equivalent deformation modulus value and are studied through numerical simulation.(3)Triaxial compression test numerical model is established and the feasibility is identified, plenty of triaxial compression test computer simulations are carried out for rock mass containing structural surfaces, anisotropy, size effect, dig angle and gap of rock mass equivalent elastic modulus upon values and influences of structural surface strength upon equivalent intensity parameters values are studied, and on this basis triaxial compression test of rock mass is simulated and equivalent elastic modulus is figured out, bearing plate deformation is overcome and theoretical defects of equivalent elastic modulus are solved,opening a new way to figure out equivalent elastic modulus of rock mass containing structural surfaces.