Study On Mechanical Parameters Characterization Of Heterogeneous Rock Mass And Rock Bridge Coalescence Criterion

Rock mass is a kind of complex structure made of rock and structural surface.With further research,more and more scholars recognize the structure surface plays a controlling role in mechanical properties of rock mass.Rock structure relative to other engineering structures of the most notable feature is the heterogeneity of the mechanical parameters.Secondly,since the structure of rock face cut,making the formation of a large number of rock blocks,and with the interaction between the structures of the surface will appear through the phenomenon of structural surfaces.Therefore,this article about the rock heterogeneous processing,engineering structures through the surface between the rock bridge and through the application of these guidelines three main issues the following research:Using the random weighting method,combining with MATLAB and FLAC3D,the rock mechanics parameters in the numerical simulation of the non homogenization.In the rock mechanical parameters of heterogeneity of treatment,according to the theory of random weighting parameters kid rock samples were analyzed.MATLAB can be obtained by means of mechanical parameters of rock mass eigenvalues and the different forms of distribution of random numbers in determining the basis of random weighted frequency,and then use FLAC3D simulation by means of the elastic modulus of the rock mechanics parameter uniform distribution,Gaussian distribution beta distribution and the comparative analysis,in addition to the numerical simulation were compared meshing size.Not only to achieve the mechanical parameters of rock mass in the numerical simulation of non-homogenized,and make more accurate simulation results.The solution of the coalescence coefficient under the non-homogeneous condition of rock mass parameters.In the numerical simulation to achieve non-homogenized mechanical parameters on the basis,for the rock structure of this phenomenon rock bridge through simulation analysis,first using the control variable method of obliquity,bridge angle,structure surface length structural surface width and spacing structure plane end this five influencing factors single factor analysis,and then consider the interaction between various factors,but also carried out five factors and flve levels L25(56)orthogonal experiment,through data fitting analysis,statistical regularities through coefficients between the factors that the statistical formula through coefficient.Using the coordinate transformation method,the structural plane is calibrated and the stability is analyzed.the application of the formula coefficients obtained through the rock project to Fan Village tunnel,for example,through the structure of the surface of the search for and determination,rock bridge through the judgment,confirmed the structure of the surface treatment methods as well as through the rear side of the structure Spatial calibration analysis process and other issues,to take advantage of GeoSMA-3D for engineering rock mass stability analysis.