Research on Excavation Method and Parameter Optimization of Broken Ore in Metal Mine Based on Two-Dimensional FDEM
The finite-discrete element method(FDEM)was used to establish two models with a route size of 4.5 m×4 m.The deformation and failure process and stability of rock mass under mechanical excavation and blasting excavation were compared and analyzed,so as to determine the reasonable excavation method of broken ore body.Due to the influences of horizontal stress and vertical stress,the influences of route span and height direction were different.The analysis models of4m×4m,4 m× 5m,5m×5m,6m×5m and 5m×6m route sizes were established respectively to simulate the deformation and failure law and stability of surrounding rock of mechanical excavation route.According to the mutation criterion of key point displacement and the mutation criterion of surrounding rock failure range,the following conclusions were finally drawn.Firstly,when the size of mechanical excavation route is not more than 5 m× 5 m,the surrounding rock is stable.Secondly,when the size of mechanical excavation route is greater than 5 m× 5 m,the stability of surrounding rock is greatly reduced after mechanical excavation.Thirdly,when the size of mechanical excavation route is 5 m×6 m,the stability of surrounding rock is the lowest.The research process and results can provide a reference for the mines with broken ore body mining by route method.
万方数据
维普
