Study On Dilution Control And Stability Analysis Based On 3D Mining Database

Being lack of the basic data of stopes with long or medium long blast holes in underground mines in our country and out of control of the loss and dilution, fragmentation and failure of fill mass and surrounding rock, they restrict the application of the efficient mining methods with long and medium long blast holes in our country correspondingly. And compared with the developed countries, the application ratio of long or medium long blast holes mining methods is obviously somewhat low. Moreover, researches on the stability of multi cavities and cavity under backfilling lack systematic study. It is awaited for more researches in theory and experiment further. The numerical simulation result is difficult to test practically in the past. And its reference value has certain question. Aiming at above questions, the author studied deeply and systematically on the spatial data acquisition of stopes with long and medium-long blast holes, dilution and stability, combining with two main projects: the 11^th five-year National Key Technology R&D Program "Comprehensive Technology of Efficient Mining and Safety Environment Control in Deposits with Multi Disaster Source" (2006BAB02B04-1) and the Science Subjects Expansion Funds Project of CSU "Study on 3D Spatial Data Acquisition and Visualization of Cavities" (07SDF09). The main research contents and results in the dissertation are as follows:First of all, surveying method of stopes and cavities based on 3D laser scanning technology was studied systematically. The 3D spatial data gaining principle and the 3D laser scanning technology principle were explored in theory. Laser scanning data processing and construction method of the 3D visualization model were studied.Secondly, the laser propagation rule in the underground air and error influencing factors of scanning point clouds were studied systematically. Its error's origin and error's influencing factors were analyzed based on the error propagation rule, and the sole point position precision of the cloud data was deduced finally; The propagation characteristics of laser beam in underground air medium were studied, primary causes of the laser energy decaying in the underground were explored theoretically and practically.Thirdly, visual data mining of 3D cavity models and 3D spatial databases were performed systematically. From the visual data mining of geometry information, the spatial relations information, the attribute information as well as the union of the spatial and non-spatial information, we studied the theories, techniques and methods of the mine spatial information visual data mining, discovered the valuable and in-depth information hiding behind the data and laid the foundation of applying these data and information better.Fourthly, the new methods of the stope dilution control based on 3D mining database were explored theoretically and technically. The new mode of stope dilution control in continuous mining was studied. The interaction and combination of 3D laser surveying and the efficient continuous mining methods were searched for. The new mode of stope dilution control in reconstructed mining environment was studied, the decrease of artificial structure destruction and dilution were explored; The new method of pillar stoping based on 3D database was studied, the problem of the pillar resources recovery which 2-step stoped was solved. The precise counting method of dilution in the actual mining process based on 3D database was studied.Finally, the mechanism and affecting factors of cavity surrounding rock failure were explored. By the numerical simulation and theoretical analysis, the failure rules of surrounding rock in multi cavities and cavity under backfilling were studied, the simulation result was tested by CMS scanning; By systematical investigation of the regional geology rock layer and laboratory test, the accurate numerical simulation parameters were gained, and the influence of parameter variation to the simulation result was analyzed. The techniques, theories and methods of cavity safety control and dealing were studied. The evolved rules of cavity roof failure were studied by CMS scanning.In short, the research in this dissertation is based on the frontal of the subject and combined with underground mining practice closely. The theories and methods of mathematics, mechanics, graphics, mining, advanced experiment means and technical methods are used in studying on cavity spatial data acquisition, dilution control and stability analysis in depth and detail. It founded a theoretical and technological basis for realizing economic, safe and efficient mining. The research in the dissertation is of important theoretical significance and engineering application values.