| With the extraction and exhaustion of deep orebody,great attentions having been paid to hazardous orebody which is around cavities. Due to the long mining history,there have many hazardous cavities in Tangdan Copper mine, the lower level stopes are disturbed by the distribution of stress and displacement of upper hazardous cavities.In oder to keeping the disturbed stopes stable and extracting in a efficient and safety way,structural parameter of lower stopes and extraction sequence are optimized in numerical simulation approach.The followings are investigated carefully:(1) Cavity Monitoring System are used to detecting hazardous cavities,three-dimentional modeling are established by modeling software,the properties of cavities are investigated too,and volume statistic are conducted,the total volume of cavities is 4153932.28m3,which is not contained the surface cavities and filled cavities by falling rock.(2) orthogonal experimental design is conducted to structural parameters simulation in a efficient way, which not only avoid the complexity of whole tests,but also boost the efficiency.3 levels and 3 factors(stope length,pillar width and ceiling thickness) are used to slecting the better choice.(3) Hoek-Brown theory is used to discounting the parameters of lab tested rock corresponding to geology situation.(4) the data structure of three dimentional modeling software-DIMINE and brick grid in FLAC3D are analysised carefully,and the exchange software are compiled which can import block model data in DIMINE software directly,which is very convenient and efficient.(5) the stope in 1770 levle which are disturbed by upper hazardous cavities are calculated by FLAC3D to investigate the stress,displacement and plastic zone reponse in the model.The outcome shows that the better structural parameters are 25m in ceiling 20m in pillar 50m in the length of stope,and the better mining sequence is from east to west in local stopes in 1770 level. |
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