| A large amount of cavities formed by the metal mineral resources underground mining is not only endangering mine's safety but also bringing about serious difficulty to resource reclaim sufficiently. Disaster cavities are one of urgent and difficult problems to be solved in the process of safety and efficiency exploitation. The research and application of relevance technology, such as the dynamic acquisition of 3D information, the numerical analysis and simulation of dynamic destabilization and so on, is becoming a significant research topic confronted by our country metal mine safety in production.Methods such as theoretical analysis, scene monitoring, numerical simulation and so forth are used synthetically in the paper. Using the Cavity Monitoring System (CMS), mine software Surpac, numerical simulation software Flac3D and RFPA as the main digital tools, coupling the project (2007BAK22B04-12) supported by the National 11th Five-Year Science and Technology Supporting Plan of China "investigation and accident identification key technology of large-area cavities in metal mine", aiming at the practical engineering of cavities in Donggua Shan Copper Mine, Fankou Lead-Zinc Mine, and Tongkeng Mine, technology of 3D information acquisition and dynamic destabilization numerical simulation of disaster cavity in metal mine are carried out, and the main research contents are as follows.(1) The different cavity CMS detection methods are put forward according to different conditions. The principle and method of the point cloud data filtering and splicing of CMS cavity detection are studied, and the format conversion of cavity detection initial point cloud data is realized successfully. The Delaunay triangulation method of cavities 3D modeling is researched. The cavity 3D model technology based on mine software Surpac, which has higher visual degree, editable and better adaptability, is proposed, and it has been successfully applied in the cavity 3D modeling of mine.(2) The influence law of multi-phase and multi-field complicated environment, such as high temperature, high humidity, dense dust and strong smoke, is researched. The relations among the scanning head adjust parameters, supporting bars inclination and rotation angle are obtained using the polynomial fitting method. Based on the measured point's coordinates, the scanning head dip angle error correction formula is derived. According to the results to modify the initial detection data, the accurate space position of cavity can be obtained. All kinds of problems of model can be resolved through modifying the scanning point parameters and editing model, which is first put forward to, which establishes technical foundation for the exact acquisition of the relevant cavities information, such as spatial pattern, area and volume size, the degree of collapse.(3) Aimed at the actual situation of Tongkeng Mine, Fankou Lead-Zinc Mine, and Donggua Shan Copper Mine, with the help of the cavity monitoring system and mining software Surpac, the 3D cavity models are obtained, and then, based on the cavity models, the relevance visualization technologies are researched, such as the 3D monitoring and risk visualization grading of disaster cavities, mining index visible calculation based on cavity 3D monitoring and stope block modeling and 3D dynamic monitoring of collapse area in deep mine.(4) On the base of comprehensive research on the file data format of numerical and geoscience simulation softwares, the coupling of 3D geoscience modeling with numerical simulation through file format conversion and data conversion interface program, is put forward to, which realizes the coupling of 3D geoscience modeling with numerical simulation and lays the foundation for the structure of pretreatment model of numerical analysis and simulation for complex cavity dynamic destabilization.(5) The 3D geology models are constructed using Surpac for the dynamic destabilization analysis of collapse cavity in Donggua Tongkeng Mine, the collapse cavity 3D solid model based on CMS detecting data is established, and then the block model is generated through constraint evaluation based on solid models. Using the coupling method of 3D geoscience modeling with numerical simulation, the program of "Surpac-Flac3D" data conversion interface is compiled and then the large and complex pretreatment model before Flac3D numerical analysis of collapse cavity dynamic destabilization is structured. On the base of the blasting seismic wave of field measurement of collapse area, by means of Flac3D foundation of dynamical analysis, meanwhile considering the influence of cavity excavation process and blasting vibration on the collapse stability, the process and mechanism of cavity dynamic destabilization is simulated and the numerical analysis method of dynamic destabilization of disaster cavities in metal mine is formed.(6) Based on the field measurement and information acquisition of disaster cavities in Tongkeng Mine and coupling the risk classification results of cavity, the simulation technology of dynamical destabilization of disaster cavities by means of the rock failure process analysis RFPA is researched. The simulation method of dynamical destabilization of disaster cavities in metal mines is formed, which provides the technical support for disaster prediction and control of of large area disaster cavities.This paper combines engineering practice closely, comprehensively use the means of rock mechanics,3D modeling technology and method, cavity precise monitoring technology and numerical analysis software, the technology of 3D information acquisition and dynamic destabilization numerical simulation of disaster cavity in metal mine are deeply researched. The research results are significant have important theory and practical significance on the investigation, safety evaluation, disaster prediction and control of cavities and resources safety and efficiency exploitation in metal mine. |
