大倾角中厚煤层破碎顶板炮采转综采围岩稳定性研究

发布时间：2019-06-01 09:06

【摘要】：大倾角煤层因为其岩层结构的独特性,与缓倾斜近水平煤层不同,煤层开采有其特殊的岩层变化规律。大倾角破碎顶板采场,岩层节理裂隙发育较好,整体强度差,自稳能力低,在支护方面需要更多的应对。迄今为止,我国在大倾角煤层开采过程中的围岩控制、岩层运动规律、矿压显现规律等问题上进行了一定的理论和实验研究,取得了丰富的经验,但对大倾角破碎顶板炮采转综采的研究相对较少。因此开展本项目的研究有着重要的理论意义和工程应用价值。本文以唐家河煤矿大倾角中厚煤层破碎顶板1811工作面为研究背景,通过理论分析,数值模拟分析、现场实测数据分析等方法,对大倾角中厚煤层破碎顶板炮采转综采过程中初采期,转型期,综采期这三个时期中采场围岩活动情况,综采开切眼处围岩稳定性,应对的支护要求,生产技术方案等方面的内容进行了分析研究。论文取得的主要研究成果如下:①通过对1811工作面地质概况的深入了解,炮采转综采过程中综采开切眼处围岩稳定性的力学理论分析,以及运用不同方法计算支护强度,来最终优化得出炮采转综采技术方案。②利用计算机数值模拟方法,模拟炮采转综采过程中三个时期(炮采期,转型期,综采期)的围岩稳定性情况,验证所得炮采转综采技术方案的可行性。③进行现场试验,得到一个半月时间内,13个测点的支柱矿压值以及顶底板位移数据,并将其与数值模拟数据进行对比分析。由此得出1811工作面的炮采转综采过程中综采开切眼处围岩稳定性情况,在试验中验证了该技术方案的可行性。
[Abstract]:Because of the uniqueness of its rock structure, coal seam mining has its special rock layer variation law, which is different from that of gently inclined and near horizontal coal seam. In the broken roof stope with large dip angle, the joint and fracture of rock strata are well developed, the overall strength is poor, and the self-stabilization ability is low, so more countermeasures are needed in support. So far, some theoretical and experimental studies have been carried out on the control of surrounding rock, the law of rock movement and the law of mine pressure appearance in the mining process of high dip coal seam in China, and rich experience has been obtained. However, the research on the fully mechanized mining of broken roof with large dip angle is relatively few. Therefore, the research of this project has important theoretical significance and engineering application value. In this paper, based on the research background of 1811 working face of broken roof in medium and thick coal seam with large dip angle in Tangjiahe Coal Mine, through theoretical analysis, numerical simulation analysis, field measured data analysis and so on, For the initial mining period, the transition period and the fully mechanized mining period of the broken roof in the medium and thick coal seam with large dip angle, the surrounding rock activity of the stope in the three periods of the fully mechanized mining period, the stability of the surrounding rock at the cutting eye of the fully mechanized mining, and the supporting requirements, The production technology scheme and other aspects of the analysis and research. The main research results of this paper are as follows: 1 through the in-depth understanding of the geological situation of 1811 working face, the mechanical theoretical analysis of the stability of surrounding rock at the opening of fully mechanized mining during blasting to fully mechanized mining, and the calculation of support strength by different methods, Finally, the technical scheme of blasting mining to fully mechanized mining is obtained. 2 the stability of surrounding rock in three periods (blasting mining period, transition period, fully mechanized mining period) in the process of blasting mining to fully mechanized mining is simulated by using computer numerical simulation method. The feasibility of the technical scheme of gun mining to fully mechanized mining is verified. 3 the field test is carried out, and the pillar mine pressure value and top and bottom plate displacement data of 13 measuring points in one and a half months are obtained, and the data are compared with the numerical simulation data. From this, the stability of surrounding rock in the process of fully mechanized mining from gun mining to fully mechanized mining in 1811 working face is obtained, and the feasibility of the technical scheme is verified in the test.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD327.2

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