锦界矿开采沉陷主控因素及覆岩移动规律模拟研究

发布时间：2018-05-21 08:13

本文选题：锦界矿 + 开采沉陷　；参考：《内蒙古科技大学》2015年硕士论文

【摘要】：矿产资源被大面积开采出来之后，使上覆岩层中各岩层中的应力平衡状态被打破，从而引起上覆岩层的持续性的移动及破坏，最终岩层中的应力重新分布达到新的平衡。因此，把由于开采引起上覆岩层中产生变形、移动、裂隙及冒落等的这种现象称为“开采沉陷”。“开采沉陷”现象是属于采动过程中的复杂损伤问题。目前，国外对开采沉陷研究的理论比较成熟，国内对开采沉陷的研究主要集中在中东部矿区薄松散层及北部厚松散层矿区，而对于神东矿区风积沙覆盖区的开采沉陷研究涉及较少。基于神东矿区锦界矿地质资料和其煤岩物理力学参数，建立锦界矿开采沉陷数值模型和覆岩移动数值模型，对其进行分析及研究，揭示出在风积沙覆盖条件下的锦界矿开采沉陷主控因素及其对地表沉陷的影响规律，并提出锦界矿地表沉陷预测模型和覆岩移动规律，为锦界矿预测地表沉陷、安全开采及其地面保护提供参考依据。本文主要采用层次分析法（AHP）、正交试验、方差分析、线性回归，以及3DEC和FLAC3D数值模拟软件进行综合分析及研究，主要的内容有以下几个方面：（1）收集锦界矿有关资料，在勘察队取得岩芯并加工成标准试样，，通过试验得锦界矿的煤岩物理力学参数；（2）根据锦界矿地质资料，采用层次分析法（AHP）筛选出锦界矿开采沉陷的主控因素（松散层厚度、采高和覆岩综合硬度）；（3）根据锦界矿31106综采工作面图和Jb203-1钻孔柱状图，基于正交试验建立锦界矿矿开采沉陷数值模型，并采用方差分析法和线性回归分析法得出了在多因素共同作用下锦界矿开采沉陷主控因素的敏感性及其对锦界矿开采沉陷规律的影响。根据锦界矿地质资料及主控因素建立锦界开采沉陷预测模型。（4）通过对锦界矿覆岩移动数值模拟研究，得出锦界矿31106工作面的上覆岩层是复合单一关键层。对于上覆岩层来说，其移动是非线性的；下沉量和下沉范围与距煤层顶板的距离有关，距离越近其下沉量和下沉范围就越大。覆岩移动不仅与距直接顶的距离有关，还与各岩层的岩性、厚度以及关键层结构与位置有关。研究结果为锦界矿工作面的安全生产及地表沉陷预测、防治提供一定指导和依据。
[Abstract]:After the mineral resources are mined out in a large area, the stress equilibrium state in the overlying strata is broken, which leads to the continuous movement and destruction of the overlying strata, and finally the stress redistribution in the overlying strata reaches a new equilibrium. Therefore, the phenomenon of deformation, movement, fissures and caving in overlying strata caused by mining is called "mining subsidence". The phenomenon of mining subsidence is a complex damage problem in mining process. At present, the theory of mining subsidence research abroad is relatively mature. The domestic research on mining subsidence mainly focuses on the thin loose layer in the central and eastern mining area and the thick loose layer mining area in the north. However, there is little research on the mining subsidence in the aeolian sand overlying area of Shendong mining area. Based on the geological data and physical and mechanical parameters of coal and rock, a numerical model of mining subsidence and a numerical model of overlying rock movement in Jinjie mining area are established, and the models are analyzed and studied. This paper reveals the main controlling factors of mining subsidence in Jinjie mine under the condition of eolian sand cover and its influence on surface subsidence, and puts forward the prediction model of surface subsidence and the law of overlying rock movement in Jinjie mine, which is the prediction of surface subsidence of Jinjie mine. Safety mining and its surface protection provide reference basis. In this paper, the analytic hierarchy process (AHP), orthogonal test, ANOVA, linear regression, 3DEC and FLAC3D numerical simulation software are used to analyze and research. The main contents are as follows: 1) collecting the relevant data of Jinjie Mine, obtaining the core from the investigation team and processing it into a standard sample, and obtaining the physical and mechanical parameters of the coal and rock of the Jinjie Mine through the test; (2) according to the geological data of Jinjie mine, the main controlling factors of mining subsidence (thickness of loose layer, mining height and comprehensive hardness of overburden rock) are screened by analytic hierarchy process (AHP); According to the 31106 fully mechanized mining face map and Jb203-1 borehole histogram of Jinjie Coal Mine, a numerical model of mining subsidence in Jinjie Mine is established based on orthogonal test. By means of variance analysis and linear regression analysis, the sensitivity of the main factors controlling the mining subsidence of Jinjie mine and its influence on the law of mining subsidence of Jinjie mine are obtained under the joint action of many factors. Based on geological data of Jinjie mine and main controlling factors, a prediction model of mining subsidence in Jinjie is established. 4) through numerical simulation of overlying rock movement in Jinjie Mine, it is concluded that the overlying strata in 31106 face of Jinjie Coal Mine is a single complex key layer. For the overlying strata, its movement is nonlinear, and the subsidence amount and subsidence range are related to the distance from the coal seam roof, the closer the distance is, the larger the subsidence amount and subsidence range will be. The overburden movement is not only related to the distance from the direct top, but also to the lithology, thickness, structure and location of the key strata. The results provide some guidance and basis for safety production and surface subsidence prediction in Jinjie Coal Mine.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD325

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