| With the advantages of high recovery and lost rate, flashing system obtains a breakthrough progress in mining high value and mining bed. It appeared trackless mechanized mining method, cemented filling column stoping, and phase stoping etc. At the same time, the computer is widely applied to filling and surrounding rock mechanics of mutual mechanism and provides basis for design and production.There are so many villages in South area of Sijiaying iron ore. The deposit concealed under Quaternary system, and with plenty of underground. water. If adopt to opencast mining, unwater Quaternarysystem aquiclude, wide range of water environment around the mining will be damaged. If curtain grouting Quaternarysystem aquiclude, there are hundreds of meters in thickness in outer open mining realm for many kilometers. Open-pit working and tailings must occupies a lot of land, The problems difficult to solve now.According to the design by Capital Engineering & Research Incorporation LTD, the method that upward sublevel cementing filling can be used. And how to protect Quaternarysystem aquiclude to avoid destroying after lower levels filling, and gaining better technique and economic benefits are the urgent problems at the same time.17 kinds of the widely application of filling material in civil are chosen, adopt statistical survey, suitable filling material for Sijiying iron ore are choosen. Combine rock mass experiment of Sijiaying south area, adopt upward sublevel cementing fillin, measured different paste strength properties in laboratory, using FLAC3D numerical simulation software set up upward sublevel production model of this iron ore, choose horizontal stress and roof perpendicular stress as the target, analysis the influence of the different filling intensity of overburden rock stress. Demonstrate upward sublevel cementing filling can be implemented in south area of Sijiaying iron ore, and the most suitable choices of filling material to further the production practice. |
