基于PFC2D自然崩落法底部结构受力变化规律研究

发布时间：2018-08-12 19:30

【摘要】：自然崩落采矿法底部结构是整个采矿方法的“心脏”所在,底部结构的破坏将对矿山的生产及人员的安全造成不可估量的影响。本文以“云南迪庆有色金属有限公司普朗铜矿底部结构稳定性研究”为背景。在云南迪庆有色金属责任有限公司普朗铜矿提供的地质资料的基础上,采用岩体力学理论、筒仓理论对普朗铜矿首采区矿体开采过程中底部结构应力变化规律进行理论分析。同时通过数值模拟软件PFC2D模拟矿体拉底、崩落、放矿。通过模拟得出拉底推进线前方应力变化规律,放矿时次级矿柱、漏斗部分应力变化规律进行模拟分析,并提出了合理的放矿顺序。本文主要开展的研究工作如下:1.基于岩石力学、材料力学理论分析拉底空间形成时采场围岩应力及采场围岩在弹性、塑性状态下,拉底推进线前方应力变化规律。2.根据自然崩落法矿体崩落过程,通过压力拱理论总结分析了压力拱在崩落过程、工作面向前推进过程中的演化规律。分析了后拉底式、预拉底式及前进式拉底方式下底部结构的受力特征。采用PFC2D软件模拟拉底,崩落过程,分析总结了拉底推进线前方应力变化规律及应力集中区范围。3.采用JANSSEN公式、筒仓理论公式对覆盖层下压力进行理论计算,并与模拟值进行对比。建立5种覆盖层厚度放矿模型,对比分析多漏斗、单漏斗放矿下底部结构上应力,提出合理的放矿方式。分析放矿时的高动态应力在放矿漏斗各处的应力,分析漏斗处受高动态应力影响最大部位。本文分析计算所采用的数据均来自现场实际,与生产紧密结合,可以预见所得结果对现场生产和建设特别是矿山支护提供重要的理论依据。
[Abstract]:The bottom structure of natural caving mining method is the "heart" of the whole mining method. The destruction of the bottom structure will have an inestimable effect on the production of the mine and the safety of the personnel. The background of this paper is to study the structure stability of Plang Copper Mine in Yunnan Diqing Nonferrous Metals Co., Ltd. On the basis of geological data provided by Plang Copper Mine in Yunnan Diqing Nonferrous Metals liability Co., Ltd., rock mechanics theory and silo theory are used to analyze the stress change law of bottom structure in the first mining area of Plang Copper Mine. At the same time, the drawing, caving and drawing of ore body are simulated by numerical simulation software PFC2D. The law of stress change in front of the propulsive line is obtained by simulation, and the variation law of partial stress in secondary pillar and funnel during ore drawing is simulated and analyzed, and the reasonable drawing sequence is put forward. The main research work of this paper is as follows: 1. Based on the theory of rock mechanics and material mechanics, the stress of surrounding rock in stope and the variation of stress in front of propulsive line in elastic and plastic state are analyzed. According to the caving process of orebody by natural caving method, the evolution law of pressure-arch in caving process and working face forward advance process is summarized and analyzed through the theory of pressure-arch. The stress characteristics of the bottom structure under the back-drawing, pre-drawing and forward-drawing are analyzed. PFC2D software is used to simulate the process of bottom drawing and caving, and the law of stress variation and stress concentration range of stress concentration area in front of propulsive line are analyzed and summarized. The JANSSEN formula and silo theoretical formula are used to calculate the pressure of overburden, and the results are compared with the simulated values. Five drawing models of overburden thickness were established and the stress on the bottom structure under multi-funnel and single-funnel drawing was compared and analyzed. A reasonable drawing method was put forward. The stress of high dynamic stress in the ore drawing funnel is analyzed, and the most affected part of the funnel is analyzed. In this paper, the data used in the analysis and calculation are all from the field practice and are closely combined with the production. The results can be predicted to provide an important theoretical basis for the field production and construction, especially for the mine support.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD862.1;TD853.364

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