重复采动地表移动变形影响因素排序研究

发布时间：2018-04-22 20:27

本文选题：重复采动 + 地表沉陷　；参考：《山东科技大学》2017年硕士论文

【摘要】：在煤炭开发的过程中,重复采动出现的概率很高,相对于初次开采,重复采动对地表的破坏程度更强,并且有很多因素都能影响重复采动的结果。当前对重复采动地表下沉规律的研究还不够全面、系统、深入。尤其是对重复采动的最大下沉值的主控因素的研究尚有欠缺。由于众多因素都可以影响重复采动的结果,经过分析决定选择煤层间距、基岩厚度和松散层厚度作为研究对象,以研究这三个因素对重复采动沉陷盆地的影响,并得出这三个因素中对下沉最大值影响的主控因素。由于地表沉陷的研究属于岩体大变形研究,而软件FLAC3D在解决大变形的问题上具有很大的优势,也得到了国内外的广泛运用,得到了很多有价值的实用的结果,对解决大变形问题提供了很多有价值的建议,因此决定使用该软件作为本文的主要研究手段。本文基于模拟软件FLAC3D,共建立了 44个模拟模型,以研究各个因素对最终沉陷盆地和最大下沉值的影响,其中有42个模型模拟两煤层重复采动,1个模型模拟三煤层重复采动,1个模型模拟水平方向的重复采动。利用Origin软件对数据进行作图,对比了 11组两煤层重复之后的地表变化曲线和其他两个模型的地表变化曲线,而后运用正交试验法,对三个因素对重复采动最大下沉值的结果影响程度进行排序,得出主控因素和三因素影响序列,三个因素对重复采动地表下沉最大值的影响程度排序:基岩厚度松散层厚度煤层间距。结合现有的对重复采动实际地表观测的结果,发现巨厚松散层和深井开采条件下重复采动地表变形规律存在特异性。
[Abstract]:In the process of coal exploitation, the probability of repeated mining is very high. Compared with the initial mining, the repeated mining has stronger damage degree to the surface, and many factors can affect the result of repeated mining. At present, the study on the law of repeated mining subsidence is not comprehensive, systematic and in-depth. In particular, the study on the main control factors of the maximum subsidence value of repeated mining is still lacking. Because many factors can affect the result of repeated mining, it is decided to select coal seam spacing, bedrock thickness and loose bed thickness as the research objects after analysis, in order to study the influence of these three factors on the repeated mining subsidence basin. The main controlling factors of these three factors on the maximum value of subsidence are obtained. Because the study of surface subsidence belongs to the study of large deformation of rock mass, the software FLAC3D has a great advantage in solving the problem of large deformation, and has been widely used at home and abroad, and many valuable practical results have been obtained. A lot of valuable suggestions are provided for solving the problem of large deformation, so it is decided to use this software as the main research method in this paper. Based on the simulation software FLAC3D, 44 simulation models are established to study the influence of various factors on the final subsidence basin and the maximum subsidence value. There are 42 models to simulate the repeated mining of two coal seams, one model to simulate the repeated mining of three coal seams, and one model to simulate the repeated mining in the horizontal direction. Using Origin software to map the data, the surface change curves of 11 groups of two coal seams are compared with those of the other two models, and then the orthogonal test method is used. The degree of influence of three factors on the result of the maximum subsidence value of repeated mining is ranked, and the main control factors and the three factors influence sequence are obtained. The degree of influence of three factors on the maximum value of the surface subsidence in the repeated mining is ranked as follows: the spacing of the thickness of the bedrock and the thickness of the loose layer. Combined with the existing results of the actual surface observation of repeated mining, it is found that there is specificity in the law of surface deformation of repeated mining under the conditions of extremely thick loose layer and deep well mining.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD325

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