Numerical Method Based on Large Deformation Damage Constitutive Model and Application

For the high precision calculation of mechanics mechanism for surrounding rock with large deformation, numerical calculation and application of large deformation damage constitutive model have been researched. Based on large deformation finite element theory, large deformation calculation process was proposed and the statistical constitutive model and parameter estimation method of rock damage and evolution analyzed. Fully consider the region that structural unit change from elastic state to plastic state, the large deformation finite element analysis method been studied, and large deformation mechanics model of mining engineering roadway was proposed, which through weighted average method of around the node distance to calculated the excavation stress of boundary nodes. Based on engineering stable energy criterion, balance area scope and location evaluation method, as well as shear damage security evaluation method that the stability of the evaluation criteria for large deformation damage calculation was analyzed. The numerical method was used in the excavation simulation of Zheng jia-po iron mine, the results show that the calculation method can be qualitatively analyze the impact of different mining sequence and technology for the stope surrounding rock stability and get the best mining plan, but also provides important information for decision-making of deep deposit mining technology.