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金属矿隐患空区三维信息获取及其动力失稳数值分析技术研究
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摘要
金属矿产资源地下开采形成的隐患空区不仅危及矿山的安全,而且对资源的充分回收造成困难,隐患空区业已成为我国矿山安全、高效开采过程中迫切需要解决的难题之一。开展金属矿隐患空区三维信息动态获取、隐患空区动力失稳数值分析与仿真等相关技术的研究与应用,是我国金属矿山安全生产所面临的重要研究课题之一。
     运用理论分析、现场探测、数值模拟相结合的方法,采用空区激光探测系统(CMS)、矿业软件Surpac及数值分析软件Flac3D、RFPA等数字化工具,紧密结合国家“十一五”科技支撑项目专题“金属矿大范围隐患空区调查及事故辩识关键技术研究(2007BAK22B04-12)”,针对冬瓜山铜矿、凡口铅锌矿及铜坑矿隐患空区的具体工程实际,开展金属矿隐患空区三维信息获取及其动力失稳数值分析与仿真技术研究,主要研究内容如下:
     (1)针对井下不同作业环境提出了相适应的隐患空区CMS现场探测方法。研究了CMS空区探测点云数据过滤与探测数据拼接的原理,实现了空区探测原始点云数据格式的转换;研究了隐患空区三维空间模型构建的Delaunay三角剖分法,提出采用矿业软件Surpac构建可视化程度更高、可编辑性更强和实用性更好的空区三维模型技术,并将该技术成功应用于矿山空区三维实体模型的构建。
     (2)探索了井下高温、高湿度、多粉尘、多烟雾等多相多场复杂环境对空区激光探测精度的影响规律;利用多项式拟合法获得CMS探测扫描头调零参数与支撑杆倾角及旋转角之间的关系;建立了用于扫描头倾角误差修正的公式,精确计算出扫描头的实际倾角,并据此对探测原始数据进行修改,准确获取空区空间位置;提出了修改扫描点数据和模型编辑两种对空区模型进行修正的方法,形成运用激光探测手段精确获取地下空区的空间位置形态、面积和体积大小、坍塌程度等相关信息的可视化技术。
     (3)针对铜坑矿、凡口铅锌矿和冬瓜山铜矿的具体工程实际,开展了金属矿空区三维信息精确获取及可视化应用研究,实现了隐患空区群三维探查及危险性可视化分级、基于空区实测与采场块体建模的回采指标可视化计算及深井采场空区垮塌三维动态探测,为矿山实施空区评价与治理、开采质量控制、资源有效回收方案制定提供了技术支持。
     (4)在综合研究地学模拟软件和数值模拟软件文件数据格式的基础上,采用文件格式转换和数据转换接口编程两种方式开展地学模拟与数值模拟耦合研究,实现了地学模拟软件Surpac与数值模拟软件Phase2、MIDAS/GTS、Ansys和Flac3D的耦合,为进行复杂空区动力失稳数值分析与仿真前处理模型的构建奠定了基础。
     (5)构建了冬瓜山铜矿用于垮塌空区动力失稳分析的三维地质模型,利用CMS实测数据建立了垮塌空区的三维实体模型,以实体模型为基础通过约束赋值生成块体模型;利用地学模拟与数值模拟耦合方法,采用编写的"Surpac-Flac3D"数据转换接口程序,实现了复杂垮塌空区动力失稳Flac3D数值分析前处理模型的构建。开展了垮塌空区动力失稳三维数值模拟研究,形成了金属矿隐患空区动力失稳数值分析方法。
     (6)在对铜坑矿隐患空区现场实测并准确获取相关信息的基础上,结合隐患空区危险性可视化分级结果,运用岩石破裂过程分析软件RFPA开展隐患空区动力失稳过程模拟仿真研究,形成了金属矿隐患空区动力失稳过程模拟仿真方法,为我国大范围隐患空区灾害预测和控制提供技术支持。
     本文紧密结合工程实践,综合运用岩石力学、三维建模技术、空区精密探测技术以及数值分析软件工具,对金属矿隐患空区三维信息获取及其动力失稳数值模拟分析与仿真技术进行了深入的研究,对金属矿隐患空区调查、安全性评价、灾害预测与控制和资源安全高效开采,具有重要的理论意义和工程应用价值。
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.
引文
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