| Rock formation in the initial and long-term development process, through a variety of complex geological structure, leading to the presence of a large number of rock faults, joints, cracks and other structural surfaces, which jointed rock mass mechanical strength is relatively weak position its existence undermines the continuity and integrity of the rock mass. At the same time as part of engineering rock joints themselves, but also on the geometry and mechanical intricacies. Traditional mechanics methods, usually jointed rock to make a simple weakening processing, discontinuous rock mass as a continuum finite element numerical analysis, the calculation results with the actual project very different, it is difficult to scientifically jointed rock mass characterization properties.Paper considers the geometry of jointed rock engineering and mechanical characteristics, derived rules equidistant parallel joints parameter deformation modulus and strength formula, select the Hoek-Brown criterion of jointed rock mass parameters calibration equation; simultaneously based on the existing technical means to collect joints information and data, using discrete element analysis platform 3DEC consider jointed rock mechanics parameters, to establish a three-dimensional numerical model of jointed rock, a detailed discussion of the numerical simulation and engineering rock joints orientation, number of mechanical properties of rock mass; for numerical jointed rock engineering process model size effect is very obvious, specially considering the tunnel z-axis direction is 10m circumstances, a reasonable size engineering numerical model to simulate the impact of the effect of different sizes, to provide a reference for the construction engineering construction.Engineering examples, combined in Liaoning Sijiazi rock tunnel construction, the first to use live rock joints non-contact measurement and findings derived using the above formulas and numerical analysis method to calculate the Sijiazi Tunnel jointed mechanical parameters will be applied to the numerical simulation parameters discussed in increased stress on the elastic modulus values of the impact analysis of size effect, the numerical simulation to get the most reasonable size model. Taking into account the specific construction process of the project, using the proposed method and numerical models to simulate the effect of the two conditions, the tunnel surrounding rock stress situation. Numerical simulation analysis that is when the bulk of unlined slip lining process and have the force when the lining of the conditions for the smooth implementation of the project to provide a reference. |
PDF Full Text Request