自走铁矿覆岩裂隙带发育规律研究

发布时间：2018-10-31 16:10

【摘要】：裂隙带的形成是由地下矿体开采造成的,它的发育高度和形态在很大程度上代表了覆岩破坏的程度及开采扰动范围,是覆岩破坏规律的重要研究内容,也是顶板稳定性管理工作和顶板防治水的重要指标。本文依托于新平鲁电矿业有限公司自走铁矿,主要研究了倾斜、急倾斜矿体在向下逐步开采过程中的裂隙带的发育规律和影响因素的敏感性。本文首先对三带理论进行了简要介绍,并重点分析了裂隙带在发育过程中的受力情况以及主要的影响因素,再结合FLAC3D中摩尔库伦本构模型的屈服准则,使用安全系数法确定数值模型中裂隙带的上限。然后通过现场结构面调查和室内物理力学试验,折减出数值模拟所需的岩体力学参数。最后利用基于有限差分法数值计算理论的FLAC3D软件,进行了数值模拟,具体情况如下：1)根据数值模拟的需要,先是进行了现场结构面的调查,然后对具有一定代表性的上下盘围岩及矿石进行了取样,将其加工成试验所需的标准试样后,在室内进行了相关的物理力学试验。再采用Hoek-Brown经验方程对参数进行了折减,得到模拟所需的岩体的力学参数。2)针对自走铁矿所使用的无底柱分段崩落法,根据影响其覆岩裂隙带高度和发育情况的因素及敏感性分析的要求,设计了四因素、三水平的正交试验,根据试验方案建立FLAC3D模型并进行了逐段式开挖,然后根据安全系数法确定裂隙带的高度,使用SPSS数据分析软件对其影响因素的敏感性进行分析了,并进行了横向和纵向的比较。3)对影响裂隙带发育高度较明显的两个因素(矿体水平厚度和倾角)进行了单因素的模拟,并对试验结果进行曲线拟合,分析矿体向下持续开采中,裂隙带高度和形态的变化情况。4)结合开挖的高度、矿体倾角和水平厚度三个自变量,分别建立第一和第二中段裂隙带高度的多元预测函数。并根据矿山地质剖面图计算出各勘探线剖面处裂隙带的最大发育高度。
[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.
【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】：TD325

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