Numerical Simulation Of Heterogeneous Rock Mass Failure Under Compression-shear

Rock mass as widely in engineering to meet project medium, with heterogeneous features, so the calculation of rock plastic strain, shear failure and injury problems has been the focus of scholars, such as underground chamber under roof weight caused by plastic deformation area studies scholars pay their attention.The traditional finite element is established in the homogeneity assumption, not a true simulation of rock failure under pressure after the formation of the natural elastic plastic state. This paper based on Weibull distribution theory, use of FORTRAN language, on the basis of the heterogeneous rock mass shear failure criterion, using elastic total method step loading, to prepare a heterogeneous rock shear failure procedure. Based on the heterogeneous rock elastic-plastic plane theory, simulation calculation of rectangular heterogeneous rock mass damage state, the rock stress and deformation fields is significantly affected by the rock heterogeneity effects, its distribution showed disordered, random characteristics. By simulating the heterogeneous vaulted chamber in the load deformation, As a result of chamber overlying strata under gravity loads, vaulted chamber roof and floor is high stress concentration zone, chamber upper area visible funnel damage area, lower apparent inverted funnel damage area. Thus, while under high stress, roof is easy to collapse, bottom prone to floor heave. Although the chamber two to help not subjected to excessive tensile stress, but because the chamber of squeezed effect, chamber rock mass by extrusion, with the accumulation of energy, two help will have the very big volume mutations may. simulating the heterogeneous model in uniaxial compression under the effect of the failure process. The homogeneous degree is the effect of rock mass strength parameters, when the homogeneous degree bigger, rock mass structure macro intensity is larger, more uniform mechanical properties, compressive shear ability is stronger; when the homogeneity of rock mass structure more hours, macroscopic strength is smaller, more uniform mechanical properties, compressive shear capacity is poor. Therefore, simulating heterogeneous rock compression shear failure for the prediction of rock structure stability and provide a certain basis.