Pillar Stability Analysis And Real Pressure Behavior Law Research

The article is relying on long-term project "Anqing Copper Mine Ground Pressure Monitoring and Control Technology", and combining with a series outstanding technical problems in Anqing Copper. Theoretical analysis field monitoring and spot surveying and other research tools are used. We study the regularity of the activity of ground pressure in mine stope on deep large size ore body deeply and systematic. The conclusion indicates:1,With the application of rock moving deformation monitoring and theoretical analysis in a comprehensive way, the article study the pillar stability in -400m temporary level, reveals the spatial and temporal evolution of Horizontal pillar stress and the distortion distribution, in the process of adjacent Horizontal pillar mining: the temporary pillar showed significant levels of stress concentration; Mining below -400m has a significant impact on the stability of the temporary pillar. Stress and deformation of pillar show a clear trend of the oscillation. While the stress and deformation values have relatively more stable change, indicating that the temporary pillar is stable as a whole, which makes the disastrous incident impossible. Right on this basis, the level of pillaring proposed engineering measures.2,With equilibrium Arched theory and consolidated filling force characteristics, the establishment of a backfill computation model has come into being,With the application of the limited equilibrium theory, which has obtained linear growth relation between the exposited altitude of backfill body and the maximum normal stress of landslide surface. The relationship indicates that the higher exposited of backfill body , the higher the required strength of it.3,With on-site clinometers, ground penetrating radar and C-ALS probe means to study the deformation of the backfill, which reveals parts of the filling on the deformation of the body increases with depth, in the upper edge of the filling may occur the carving phenomenon, but the overall is stable.4,Researched the pressure behavior regularity in pillaring systematic and deeply by using photo elastic stress meter and rock movement monitoring and explored its spatial-temporal evolution: The stope of deep mining pillar will induce the secondary stress change and obvious stress concentration of adjacent rock, but with the enclosing rock getting far away from pillar stope area, pillaring work will effect it little. And deep mining activities will make little effect to the stability of goaf above - 400m.Research results mentioned above will be the technical support to recycle underground resource safe, efficient and utmost for anqing copper mine, also provide reference value for similar mining in china.