【摘要】：裂隙帶的形成是由地下礦體開采造成的,它的發(fā)育高度和形態(tài)在很大程度上代表了覆巖破壞的程度及開采擾動范圍,是覆巖破壞規(guī)律的重要研究內(nèi)容,也是頂板穩(wěn)定性管理工作和頂板防治水的重要指標。本文依托于新平魯電礦業(yè)有限公司自走鐵礦,主要研究了傾斜、急傾斜礦體在向下逐步開采過程中的裂隙帶的發(fā)育規(guī)律和影響因素的敏感性。本文首先對三帶理論進行了簡要介紹,并重點分析了裂隙帶在發(fā)育過程中的受力情況以及主要的影響因素,再結合FLAC3D中摩爾庫倫本構模型的屈服準則,使用安全系數(shù)法確定數(shù)值模型中裂隙帶的上限。然后通過現(xiàn)場結構面調(diào)查和室內(nèi)物理力學試驗,折減出數(shù)值模擬所需的巖體力學參數(shù)。最后利用基于有限差分法數(shù)值計算理論的FLAC3D軟件,進行了數(shù)值模擬,具體情況如下：1)根據(jù)數(shù)值模擬的需要,先是進行了現(xiàn)場結構面的調(diào)查,然后對具有一定代表性的上下盤圍巖及礦石進行了取樣,將其加工成試驗所需的標準試樣后,在室內(nèi)進行了相關的物理力學試驗。再采用Hoek-Brown經(jīng)驗方程對參數(shù)進行了折減,得到模擬所需的巖體的力學參數(shù)。2)針對自走鐵礦所使用的無底柱分段崩落法,根據(jù)影響其覆巖裂隙帶高度和發(fā)育情況的因素及敏感性分析的要求,設計了四因素、三水平的正交試驗,根據(jù)試驗方案建立FLAC3D模型并進行了逐段式開挖,然后根據(jù)安全系數(shù)法確定裂隙帶的高度,使用SPSS數(shù)據(jù)分析軟件對其影響因素的敏感性進行分析了,并進行了橫向和縱向的比較。3)對影響裂隙帶發(fā)育高度較明顯的兩個因素(礦體水平厚度和傾角)進行了單因素的模擬,并對試驗結果進行曲線擬合,分析礦體向下持續(xù)開采中,裂隙帶高度和形態(tài)的變化情況。4)結合開挖的高度、礦體傾角和水平厚度三個自變量,分別建立第一和第二中段裂隙帶高度的多元預測函數(shù)。并根據(jù)礦山地質(zhì)剖面圖計算出各勘探線剖面處裂隙帶的最大發(fā)育高度。
[Abstract]:The formation of fracture zone is caused by underground orebody mining. Its development height and shape represent the extent of overburden failure and mining disturbance to a great extent, and are the important research contents of overburden failure law. It is also an important index of roof stability management and roof water prevention. Based on Zetao Iron Mine of Xinpinglu Mining Co., Ltd., this paper mainly studies the development law of fracture zone and sensitivity of influencing factors in the process of gradual mining of inclined and steeply inclined ore bodies. In this paper, the three-zone theory is introduced briefly, and the stress of fracture zone during the development of fracture zone and the main influencing factors are analyzed, and then the yield criterion of Moore Coulomb constitutive model in FLAC3D is combined. The safety factor method is used to determine the upper limit of the fracture zone in the numerical model. Then the mechanical parameters of rock mass for numerical simulation are reduced by field structural plane investigation and laboratory physical and mechanical tests. Finally, the numerical simulation is carried out by using FLAC3D software based on the finite difference method. The details are as follows: 1) according to the need of numerical simulation, the field structural surface investigation is carried out first. Then the rock and ore which are representative of the upper and lower face are sampled and processed into the standard sample for the test, and the relevant physical and mechanical tests are carried out in the laboratory. Then the parameters of rock mass are reduced by Hoek-Brown empirical equation, and the mechanical parameters of rock mass are obtained. 2) the sublevel caving method without bottom pillar is used for self-walking iron ore. According to the factors affecting the height and development of the overburden fracture zone and the requirement of sensitivity analysis, the orthogonal test with four factors and three levels is designed. According to the test scheme, the FLAC3D model is established and the excavation is carried out step by step. Then, according to the safety factor method, the height of fracture zone is determined, and the sensitivity of the influencing factors is analyzed by using SPSS data analysis software. The horizontal thickness and dip angle of the orebody are simulated by two factors (horizontal thickness and dip angle of orebody), and the experimental results are fitted by curve. This paper analyzes the variation of fracture zone height and shape in the downward continuous mining of orebody. 4) combining the three independent variables of excavation height, dip angle and horizontal thickness, the multivariate prediction functions of fracture zone height in the first and second middle segments are established respectively. The maximum development height of fracture zone in the section of each exploration line is calculated according to the geological profile of mine.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD325

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