| At present, China has proven that potential sandstone type uranium resources is large, however, the development of technology is limited.In order to achieve sandstone type uranium deposits in the development and utilization in our country, the basic theory and application technology research should be conducted. A sandstone type uranium deposits in industrial uranium mineralization type is interlayer oxidation zone type. Due to the hardness of the ore, cement and other characteristics of the extent and depth, so that this kind of sandstone uranium deposits is not suitable for development in dip mining technique.By proven sandstone-type uranium resources in research and development utilizing in this project, our sandstone-type uranium deposits in mining technology level can be improved.In the research, the researchers about exploration research method mainly combined with deposits occur, and tested to the Core samples for mechanical testing of physical and mechanical parameters of rock ore,after obtaining the parameters of sandstone, mudstone roadwayexcavation deformation numerical simulation and numerical simulation of stope roof deformation test are performed. The deformation of roadway numerical simulation experiments show that the maximum displacement of the roadway placed at the top of the roadway, the maximum vertical stress located between spandrel wall and straight at the two bottom corners of roadway, Minimum principal stress is located at the two corners of roadway straight wall, whose values are 1.3979 cm ?46.973MPa?49.612 MPa and 9.7887MPa;Top roadway shear failure occurred. To ensure the tunnel excavation and the use of safety, the Lining and bolting numerical simulation experiment is performed. The simulation results show that when using Lining, vertical displacement of roadway, the vertical stress, the maximum and minimum principal stress is reduced compared with not supporting correspondingly. And with the increase in the thickness of the lining, and those things continues to decline correspondingly. The vertical displacement of the lining structure is smaller, and its withstand vertical stress is much lower than the compressive strength without shear failure.Stope roof stability numerical simulation tests reserved pillar(Pillar space are 6m×6m?7m×7m?8m×8m three options). And experiments between pillars bolt reinforced support. Through these studies, the following conclusions are concluded: 1) Roadway excavation must support.2) Adopt lining structure can effectively maintain the stability ofroadway. Considering the service life of the roadway, the author chooses lining thickness of 10, this supporting structure can meet the requirements of roadway stability.3) choosing the above bolting manner, Strength bolt has surplus, tensile failure will not occur, which can effectively maintain the stability of the roadway. Considering the service life of the roadway,the choice of a diameter of 22 mm, length of 1.5m, row spacing for bolting the structure of 2.0m can effectively maintain the stability of the roadway.4) In order to increase the rate of ore, reduce the loss of mineral resources, this way that spacing pillar 8m × 8m, pipe joints between the pillar set bolting way stoping on the roof is recommended. The length of the bolt is 1.5m, to 2m × 2m grid of conduct laid, remained intact, does cause massive damage. The research results and non-ferrous metallurgy is similar with mining analogy, the author mainly recommended a comprehensive mining, article type approach as supplemented method by the mining law adapted to this deposit mining; Because ore moderate dip,the Study used a small hydraulic jumbo mining, Mini scraper ore, which can increase mining strength, research mining method is safe and reliable. |
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