某露天矿陡倾地形排土场的稳定性安全研究

发布时间：2018-05-01 04:17

本文选题：排土场 + 安全性　；参考：《昆明理工大学》2015年硕士论文

【摘要】：本文以金平某矿山3#排土场作为研究对象,分析了以该排土场为典型的陡倾地形排土场边坡的安全问题。安全分析一般是通过查找、分析并预测系统、工程、生产活动等过程中潜在的危险和有害因素及有可能产生的危险、后果和程度,最后提出可行的安全对策措施的研究过程,从安全科学的角度来说,其概括为发现危险源、分析危险源和预防措施,以达到研究系统安全、稳定运行的目的。排土场是制约矿山安全的重大危险源之一,陡倾地形排土场是排土场中的重大危险源。目前,该排土场的原始地基地形坡度在12°-30°之间,平均坡度达25°,属陡倾基底排土场,加之设计堆排高度为230m,实际已排土堆置高度达134米,堆排仍在继续,存在很大的安全隐患。论文对排土场的安全进行分析和研究。第一,论文在前期工作中收集了大量文献资料,其中包括相似陡倾基底排土场的综合分析、局部分析、稳定性分析等,也包括致灾模式、排土物料性质、排土堆置、排土场周边情况等相关问题。第二,在该排土场的实习过程中,跟进生产状况,分析排土场情况,对比之前的分析内容得出该排土场的灾害模式。第三,运用事故树的分析方法做出当前排土场的安全分析。从安全分析的结果得出排土场的稳定性是排土场安全研究中存在的最大影响因素,进而进行排土场稳定性分析。第四,排土场的稳定性分析,根据实地工程调查和该矿山排土场设计资料以及其他相关排土场文献资料,分析排土场典型剖面位置,应用快速拉格朗日法程序进行数值模拟,模拟对象是该排土场的整个堆积体和基底山坡。论文模拟利用建立相应地质模型导入FLAC3D中对排土场的稳定性进行分析,分析过程结合排土场物料性质、堆排情况以及即将堆排的设计情况,将仍在持续堆排的排土场从下到上分为三个大区域,第一区域为拦渣坝以上第3和第4台阶,第二区域为第5、6、7台阶,第三区域为第8和第9台阶。模拟过程可明显看出,当堆排到30°的地基地段时,坡顶坡肩处存在明显潜在滑动面,坡脚处有压迫脚现象,地基地形坡度大的地方,剪应变速率更快,存在安全隐患。研究也揭示随着堆载的区域叠加,该矿山排土场边坡变形破坏模式为排弃物内部滑动与复合式滑动,并分别得出三个区域的堆积后排土场的安全系数,第一区域到第三区域的安全系数分别为：2.1、1.7、1.4,均满足安全生产的要求,相对稳定。最后根据现场状况分析影响排土场安全因素的基础上提出相对应的措施,建议开展行之有效的治理工作,提高整个排土场生产过程的安全性,保证矿山效益与安全双丰收。本论文的研究不仅为该排土场相似的陡倾基底排土场的安全相关研究提供科学依据,也为其他矿山排土场的安全研究提供了一定参考,因此,对陡倾基底排土场的安全研究具有实际意义。
[Abstract]:Taking the dumping site of a mine in Jiping as the research object, this paper analyzes the safety problem of the slope of the dump with steep topographic features, which is typical of the dump. Safety analysis is generally through the search, analysis and prediction of the system, engineering, production activities and other processes of potential hazards and harmful factors and possible risks, consequences and degrees, and finally put forward feasible safety measures of the research process, From the point of view of safety science, it can be summarized as the discovery of dangerous sources, the analysis of hazard sources and the preventive measures, so as to achieve the purpose of studying the safety and stability of the system. Dump is one of the major hazards restricting mine safety, and steep topographic dump is a major hazard in dump. At present, the original topographic slope of the dump is between 12 掳-30 掳, with an average slope of 25 掳, which belongs to the dump with a steep base. In addition, the height of the designed reactor is 230 m, the actual height of the dump has reached 134 meters, and the pile discharge is still continuing, which has great potential safety problems. The paper analyzes and studies the safety of dump. First, in the previous work, the paper collected a lot of documents, including comprehensive analysis, local analysis, stability analysis and so on, including the comprehensive analysis of the similar steep dip foundation dump, and also included the disaster pattern, the properties of the dumping materials, the dumping pile, etc. Dumping site surrounding the situation and other related issues. Second, in the practice process of the dump, follow up the production situation, analyze the situation of the dump, compare the previous analysis content to get the disaster mode of the dump. Thirdly, the safety analysis of the current dump is made by using the accident tree analysis method. From the results of safety analysis, it is concluded that the stability of the dump is the biggest influencing factor in the safety study of the dump, and then the stability analysis of the dump is carried out. Fourthly, the stability of the dump is analyzed. According to the field engineering investigation, the design data of the mine dump and other relevant documents, the typical section location of the dump is analyzed, and the numerical simulation is carried out by using the fast Lagrangian program. The simulated objects are the entire accumulation and base slope of the dump. In this paper, the stability of the dump is analyzed by establishing the corresponding geological model into FLAC3D, and the process of analysis is combined with the properties of the dump material, the situation of the pile discharge and the design of the forthcoming dump. The dump which is still discharging is divided into three large areas from the bottom to the top. The first area is the third and fourth steps above the dam, the second area is the 5th and 6th steps, and the third is the 8th and 9th steps. During the simulation process, it can be seen that when the pile reaches 30 掳, there is obvious potential sliding surface at the top slope shoulder, the pressing foot phenomenon at the foot of the slope, the shear strain rate is faster and the safety hidden danger exists where the slope of the foundation is large. The study also reveals that the slope deformation and failure modes of the mine dump are internal slippage and composite sliding, and the safety factors of the dump after stacking are obtained respectively with the superposition of the surcharge area. The safety coefficients of the first region to the third area are respectively 1: 2.1 and 1.71.4, which meet the requirements of production safety and are relatively stable. Finally, based on the analysis of the factors affecting the safety of the dump, the corresponding measures are put forward, and it is suggested that effective treatment work be carried out to improve the safety of the whole production process of the dump and ensure the benefit and safety of the mine. The research in this paper not only provides the scientific basis for the safety related research of the dump similar to the steep dip foundation, but also provides a certain reference for the safety research of other mine dump. It is of practical significance to study the safety of dump with steep dip basement.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD854.7

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