同忻矿特厚煤层综放开采覆岩破断特征与矿压规律研究
发布时间：2018-12-19 19:37
【摘要】：同忻矿是大同煤矿集团有限责任公司第二座主采石炭二叠系煤层的千万吨级矿井。同忻井田包含侏罗系和石炭二叠系两组煤系,煤层相距100 m-300 m,石炭系3-5#煤层平均厚度达到15 m,属于特厚煤层,双系煤层都存在两硬条件,即煤层与顶板都为坚硬煤岩体。由于特厚、双系两硬的特殊条件,综放开采石炭二叠系煤层的同忻矿在生产过程中已多次遇到了上覆岩层纵向大结构破坏引起的强烈的矿压显现。因此,开展同忻矿特厚煤层综放开采覆岩破断特征与矿压规律的研究不仅可以为同忻井田双系两硬煤层安全高效开采提供重要保障,也能够为企业实现良好的经济效益和社会效益。论文针对同忻矿特厚煤层、双系两硬的特殊条件下,以8105工作面为例,应用理论分析、相似材料模拟、现场监测等方法对同忻矿8105工作面上覆岩层运动规律与矿压显现的关系进行了研究。以关键层理论为基础,确定了8105工作面上覆岩层中的关键层分布,对关键层破断与8105工作面的矿压控制进行分析,分析结果与现场来压情况进行比较,基本满足现场观测到的实际情况；采用相似材料模拟实验对侏罗系9#煤、11#煤、12#煤、14#煤开采后,石炭系开采过程中,关键层破断与8105工作面矿压显现的关系进行模拟,验证了利用复合矿压理论对工作面上覆关键层破断分析结果的正确性。研究结果表明,同忻矿特厚煤层综放开采覆岩存在垮落带和裂隙带,而无明显的弯曲下沉带,覆岩关键层的破断控制工作面的周期大压和周期小压的显现,是工作面前后方采动应力影响范围大的主要原因,以此可以预测工作面矿压的显现规律,论文的研究结果不仅为同忻矿的矿压控制提供了理论基础,也为强矿压的防治提供了科学决策的支持。同时论文的研究方法也为大同矿区其他开采石炭二叠系煤层的矿井提供有意义的借鉴和参考,具有重要的理论意义和实际应用价值。
[Abstract]:Tongxin Mine is the second coal mine of the Permian coal seam in Datong Coal Mine Group Co., Ltd. The Tongxin mine field consists of two groups of coal measures, Jurassic and Carboniferous Permian. The coal beds are separated from each other by 100m-300 m, and the average thickness of Carboniferous 3-coal beds is 15 m, which belongs to the extra thick coal seam, and there are two hard conditions in both coal beds. That is, coal seam and roof are hard coal and rock mass. Due to the special conditions of thick and double systems, Tongxin Coal Mine of Carboniferous Permian Coal seam in fully mechanized caving mining has encountered strong rock pressure phenomena caused by the destruction of vertical large structure of overlying strata many times in the process of production. Therefore, the study of overburden fracture characteristics and rock pressure law in fully mechanized caving mining in Tongxin coal mine can not only provide an important guarantee for the safe and efficient mining of double-system two-hard coal seam in Tongxin mine field. Can also achieve good economic and social benefits for enterprises. Under the special condition of double system and two hard, taking 8105 working face as an example, this paper applies theoretical analysis and similar material simulation to the extra thick coal seam of Tongxin Mine. The relationship between the movement of overlying strata and the appearance of rock pressure in 8105 face of Tongxin Coal Mine was studied by field monitoring and other methods. Based on the theory of critical layer, the distribution of key strata in overlying strata of 8105 face is determined, and the rock pressure control of critical stratum breaking and 8105 face is analyzed, and the results are compared with the situation of site pressure. Basically meet the actual situation observed in the field; The paper simulates the relationship between the breakdown of key strata and the formation of mine pressure in 8105 working face during the process of Carboniferous mining after exploitation of Jurassic 9# coal, 11# coal, 12# coal and 14# coal by using similar material simulation experiment. The correctness of the analysis results of the key strata breaking on the top of the working face is verified by using the compound rock pressure theory. The research results show that there are caving zones and fracture zones in overlying rock in fully mechanized caving mining in Tongxin coal mine, but there is no obvious bending and sinking zone, and the occurrence of periodic high pressure and periodic small pressure in the face controlled by breaking of key strata of overburden rock is not obvious. It is the main reason of large influence range of mining stress in front and rear of working face, which can predict the appearance law of face rock pressure. The research results of this paper not only provide a theoretical basis for mine pressure control in Tongxin mine, but also provide a theoretical basis for mine pressure control in Tongxin mine. It also provides scientific decision support for the prevention and cure of strong mine pressure. At the same time, the research method of this paper also provides a meaningful reference for other coal mines mining Carboniferous Permian coal seams in Datong mining area, which has important theoretical significance and practical application value.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323
本文编号：2387357
[Abstract]:Tongxin Mine is the second coal mine of the Permian coal seam in Datong Coal Mine Group Co., Ltd. The Tongxin mine field consists of two groups of coal measures, Jurassic and Carboniferous Permian. The coal beds are separated from each other by 100m-300 m, and the average thickness of Carboniferous 3-coal beds is 15 m, which belongs to the extra thick coal seam, and there are two hard conditions in both coal beds. That is, coal seam and roof are hard coal and rock mass. Due to the special conditions of thick and double systems, Tongxin Coal Mine of Carboniferous Permian Coal seam in fully mechanized caving mining has encountered strong rock pressure phenomena caused by the destruction of vertical large structure of overlying strata many times in the process of production. Therefore, the study of overburden fracture characteristics and rock pressure law in fully mechanized caving mining in Tongxin coal mine can not only provide an important guarantee for the safe and efficient mining of double-system two-hard coal seam in Tongxin mine field. Can also achieve good economic and social benefits for enterprises. Under the special condition of double system and two hard, taking 8105 working face as an example, this paper applies theoretical analysis and similar material simulation to the extra thick coal seam of Tongxin Mine. The relationship between the movement of overlying strata and the appearance of rock pressure in 8105 face of Tongxin Coal Mine was studied by field monitoring and other methods. Based on the theory of critical layer, the distribution of key strata in overlying strata of 8105 face is determined, and the rock pressure control of critical stratum breaking and 8105 face is analyzed, and the results are compared with the situation of site pressure. Basically meet the actual situation observed in the field; The paper simulates the relationship between the breakdown of key strata and the formation of mine pressure in 8105 working face during the process of Carboniferous mining after exploitation of Jurassic 9# coal, 11# coal, 12# coal and 14# coal by using similar material simulation experiment. The correctness of the analysis results of the key strata breaking on the top of the working face is verified by using the compound rock pressure theory. The research results show that there are caving zones and fracture zones in overlying rock in fully mechanized caving mining in Tongxin coal mine, but there is no obvious bending and sinking zone, and the occurrence of periodic high pressure and periodic small pressure in the face controlled by breaking of key strata of overburden rock is not obvious. It is the main reason of large influence range of mining stress in front and rear of working face, which can predict the appearance law of face rock pressure. The research results of this paper not only provide a theoretical basis for mine pressure control in Tongxin mine, but also provide a theoretical basis for mine pressure control in Tongxin mine. It also provides scientific decision support for the prevention and cure of strong mine pressure. At the same time, the research method of this paper also provides a meaningful reference for other coal mines mining Carboniferous Permian coal seams in Datong mining area, which has important theoretical significance and practical application value.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323
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