大倾角特厚煤层综放开采关键工艺参数研究

发布时间：2018-04-13 00:16

本文选题：大倾角 + 综放开采　；参考：《太原理工大学》2017年硕士论文

【摘要】：煤炭是不可再生资源,因此在其开采过程中应尽可能地采出煤炭、减少资源浪费。综放开采过程中合理的工艺参数能大大地提高煤炭的采出率。目前,国内外学者的研究方向大多是大倾角或者特厚煤层条件下综放开采过程中应力分布以及矿压显现,对于大倾角特厚煤层综放开采工艺参数的研究较少,不能有效地指导现场实践。本文以孟家窑5号煤大倾角特厚煤层综放开采为背景,采用物理模拟和数值模拟相结合的方法,对大倾角特厚煤层综放工作面的煤矸流场特征、合理采放比、放煤步距及放煤方式等进行了研究,确定了合理的综放开采工艺参数,提高了煤炭采出率,减少了资源的浪费。主要研究内容及成果如下:(1)通过建立物理相似模拟试验模型,研究不同采放比及不同放煤步距下的煤矸流场特点以及顶煤放出率和含矸率,初步确定采高为4.0m,采放比为1:2.4,放煤步距为两采一放。(2)鉴于实验室物理模拟试验可能会受到环境因素以及人为操作失误的影响,通过计算机离散元数值模拟方法再次研究不同采放比及不同放煤步距下的顶煤放出率,结果验证了实验室物理相似模拟的正确性。(3)通过理论分析与离散元数值模拟相结合的方法,研究倾角变化的情况下不同放煤方式、放煤轮次及放煤方向情况下的煤矸流场特征及顶煤放出率,确定合理的放煤方式为:煤层倾角小于35°时选取单轮顺序上行放煤方式,在煤层倾角大于等于35°选取双轮顺序上行放煤方式。本文的研究成果为孟家窑大倾角特厚煤层综放工作面的开采提供借鉴和参考,对保证矿井的安全高效生产具有重要意义。
[Abstract]:Coal is a non-renewable resource, so it is necessary to extract coal as much as possible and reduce the waste of resources.Reasonable technological parameters in the process of fully mechanized caving mining can greatly improve the coal extraction rate.At present, most of the research directions of domestic and foreign scholars are stress distribution and mine pressure appearance in the process of fully mechanized caving mining under the condition of large dip angle or super thick coal seam, but less research on the technological parameters of fully mechanized caving mining in high dip and extra thick coal seam.Can not effectively guide the field practice.In this paper, based on fully mechanized caving mining of Mengjiayao No. 5 coal seam with large dip angle and extra thick coal seam, using the method of combining physical simulation and numerical simulation, reasonable mining and caving ratio of coal and gangue flow field characteristics of fully mechanized caving face with large dip angle and extra thick coal seam are analyzed.Based on the study of coal drawing distance and coal drawing method, reasonable technological parameters of fully mechanized caving mining are determined, the coal extraction rate is improved and the waste of resources is reduced.The main research contents and results are as follows: (1) by establishing the physical similarity simulation test model, the characteristics of coal gangue flow field under different mining / drawing ratio and different coal drawing distance, as well as the top coal extraction rate and the gangue content rate are studied.It is preliminarily determined that the mining height is 4.0 m, the ratio of mining to caving is 1: 2.4, and the step distance of coal drawing is two mining and one caving. (2) in view of the fact that the laboratory physical simulation test may be affected by environmental factors and human error,Through the computer discrete element numerical simulation method, the caving rate of top coal under different mining / drawing ratio and different coal drawing step distance is studied again.The results show that the laboratory physical similarity simulation is correct. (3) by combining the theoretical analysis with the discrete element numerical simulation, the different coal drawing methods under the condition of the variation of inclination angle are studied.The characteristics of coal gangue flow field and the top coal caving rate under the condition of coal drawing wheel and coal drawing direction are determined as follows: when the coal seam inclination angle is less than 35 掳, the single wheel sequential upward caving mode is selected.When the dip angle of coal seam is greater than or equal to 35 掳, the two wheel sequential upward caving mode is selected.The research results of this paper provide reference and reference for the mining of fully mechanized caving face in Mengjiayao large dip angle and super thick coal seam, which is of great significance to ensure the safe and efficient production of the mine.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD823

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