【摘要】：自然崩落采礦法底部結(jié)構(gòu)是整個采礦方法的“心臟”所在,底部結(jié)構(gòu)的破壞將對礦山的生產(chǎn)及人員的安全造成不可估量的影響。本文以“云南迪慶有色金屬有限公司普朗銅礦底部結(jié)構(gòu)穩(wěn)定性研究”為背景。在云南迪慶有色金屬責(zé)任有限公司普朗銅礦提供的地質(zhì)資料的基礎(chǔ)上,采用巖體力學(xué)理論、筒倉理論對普朗銅礦首采區(qū)礦體開采過程中底部結(jié)構(gòu)應(yīng)力變化規(guī)律進(jìn)行理論分析。同時通過數(shù)值模擬軟件PFC2D模擬礦體拉底、崩落、放礦。通過模擬得出拉底推進(jìn)線前方應(yīng)力變化規(guī)律,放礦時次級礦柱、漏斗部分應(yīng)力變化規(guī)律進(jìn)行模擬分析,并提出了合理的放礦順序。本文主要開展的研究工作如下:1.基于巖石力學(xué)、材料力學(xué)理論分析拉底空間形成時采場圍巖應(yīng)力及采場圍巖在彈性、塑性狀態(tài)下,拉底推進(jìn)線前方應(yīng)力變化規(guī)律。2.根據(jù)自然崩落法礦體崩落過程,通過壓力拱理論總結(jié)分析了壓力拱在崩落過程、工作面向前推進(jìn)過程中的演化規(guī)律。分析了后拉底式、預(yù)拉底式及前進(jìn)式拉底方式下底部結(jié)構(gòu)的受力特征。采用PFC2D軟件模擬拉底,崩落過程,分析總結(jié)了拉底推進(jìn)線前方應(yīng)力變化規(guī)律及應(yīng)力集中區(qū)范圍。3.采用JANSSEN公式、筒倉理論公式對覆蓋層下壓力進(jìn)行理論計(jì)算,并與模擬值進(jìn)行對比。建立5種覆蓋層厚度放礦模型,對比分析多漏斗、單漏斗放礦下底部結(jié)構(gòu)上應(yīng)力,提出合理的放礦方式。分析放礦時的高動態(tài)應(yīng)力在放礦漏斗各處的應(yīng)力,分析漏斗處受高動態(tài)應(yīng)力影響最大部位。本文分析計(jì)算所采用的數(shù)據(jù)均來自現(xiàn)場實(shí)際,與生產(chǎn)緊密結(jié)合,可以預(yù)見所得結(jié)果對現(xiàn)場生產(chǎn)和建設(shè)特別是礦山支護(hù)提供重要的理論依據(jù)。
[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.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD862.1;TD853.364

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本文編號：2180122