Research On Mechanism Of Anchorage In Rock Based On Complex Material Model

Based on the component structure of the anchored rock mass, it can be treated as a kind of special composite material with the view of the composite material mechanics. The anchored rock mass is Steel-Fiber Reinforced Composite Rock when the function relation between the bolt and rock is treated as ralation of the fiber and the base. Based on the model of Fiber Reinforced Composites (FRC), the dissertation studyed the funtion of the reinforcing of the bolt to the anchored rock mass and energy analysis of the failure of anchoring, and researched the law of the stress distribution of the anchored rock mass theoretically and by numerical simulation.With the view of the composite material mechanics, the dissertation treated the anchored rock mass as Fiber Reinforced Composite, and built the ideal model of the anchored rock mass, and then analyzed the mechanical properties of the anchored rock mass theoretically.The dissertation applied the Shear Lag theories in Fiber Reinforced Composite material mechanics to the analysis of stress distribution of the anchored rock mass. Based individually on the shear deforming and Mindlin solution, the dissertation deduced the stress distribution functions of the anchored rock mass under loadings, analyzed the distribution form of axial stress of the bolt and shear stress of the anchoring interface, and discussed the relations between the stress distribution and the properties of bolt and rock mass. Then the stress distribution of anchored rock mass with partial pull-out failure is analyzed based on the maximum shear stress criterion.According to the relations between the bolt and rock mass, the dissertation built the bolt struction element model that was applied into the numerical simulation of the shear stress distribuion of the anchoring interface in compsite rock mass under loading. With the usage of Finite Element Method (FEM) software ANSYS, the shear stress distribution of the anchoring interface is simulated, and the changing law of stress distribution of anchored rock mass with different loadings, properties of rock mass, diameter of bolt etc. And when the composite rock mass is made up of some layer rocks, the stress distribution and the stress changing law was also simulated in the dissertation.