In Dagushan Lron Mine South Side Joint Rock Mining Damage Characteristic Research

Take the south of Angang Dagushan open-pit iron gneissic migmatiteFestival joint rock mass slope as the engineering background, and contains a largenumber of random distribution of damage to the three-dimensional structure such asspace for the open pit of the rock mass. Through the level field geological survey ofthe Slope rockmass in Dagushan iron ore south from+85to-450metres, thebench slope is in the use of scan-line method for the measurement of the fracture thepluton surface of joints. The investigation and analysis of jointed pole diagram, andother analytical techniques of the density maps and charts,which is used in the rockjoint tendency, inclination and trace length feature is the establishment of the jointdistribution of the probability model. Researching the probability of injury spatialdistribution and evolution in open pit slope jointed rock mass with the stopeexcavationdecurrent and studying the establishment of the development of the rockmass strength with damage evolution, thereby establishing the reliability of jointedrock slope three-dimensional dynamic evaluation model,of which are all based on theFLAC-3D numerical simulation techniques, damage mechanics theory, the theory offracture mechanics, finite element method analysis technique, three-dimensional jointnetwork simulation, the Visual Basic programming language. According to thegeneralized model for jointed rock mass,we are using the the Beacher disc to modele3D jointed mass distribution network.3D jointed network simulation technology isbased on the use of Kawamoto about the basic principles of jointed rock mass damagetensor theory to establish the the jointed rockmass initial damage tensor of thegeneralized model. Using FLAC-3D to do the numerical simulation of dimensionaldynamic in jointed rock slope excavation unloading of Iron ore south in AngangDagushan. The application of the embedded FLAC-3D FISH language, the VisualBasic language with preparation damage evolution process of jointed couplinganalysis is the way to do every step of the excavation and the way to study themechanism and laws of the rock mass damage evolution.