司马煤矿底板陷落柱阻隔水机理研究

发布时间：2018-04-05 16:39

本文选题：陷落柱　切入点：阻水机理　出处：《中国矿业大学》2015年硕士论文

【摘要】：陷落柱突水是地质构造异常体导致的矿井突水问题中较为典型的,同时也是危害性最大的突水情况之一。长期以来,对陷落柱突水问题的研究主要集中在陷落柱的富导水性及陷落柱的采动活化,而对陷落柱本身阻隔水能力研究较少,因此,研究陷落柱自身的阻隔水机理不但有极高的科研价值,对保证煤矿的安全开采和资源节约也有非常大的实际意义。本文结合司马煤矿底板陷落柱的发育情况及富水性,综合运用理论分析、数值模拟、室内试验、现场测试等方法与手段对司马煤矿底板陷落柱的阻隔水能力及机理进行了系统的研究,取得了如下研究成果:(1)明确了司马煤矿的陷落柱多为不导水或局部导水陷落柱且具有一定的阻隔水能力;井田内陷落柱分布规律为深部多,浅部少且成群分布,宏观上陷落柱内部压实胶结程度较好,具有较强的阻隔水能力。(2)基于弹性力学和断裂力学的理论,建立了陷落柱突水破坏力学模型并计算得到了柱体内的应力表达式,进而得到了陷落柱内部裂隙扩展贯通即陷落柱发生突水的临界水压表达式。(3)宏观上陷落柱内部压实较好,具有一定的强度;微观上X衍射荧光光谱分析、压汞实验显示成分主要是泥质和硅质,胶结和填充较好;随埋深增加孔喉分布逐渐集中,渗透性也变差;表明陷落柱阻隔水能力良好且逐渐变强。(4)数值模拟显示完整底板破坏深度约为19m,含陷落柱底板破坏深度约为35m,与相邻矿井实测数据吻合,可为实际生产提供指导意义。(5)室内陷落柱样品渗透性试验和现场陷落柱阻水能力测试均表明陷落柱具有一定的阻隔水能力,室内试验达到2-2.5MPa/m,现场测试达到1.5-2MPa/m。结合数值模拟得到含陷落柱底板破坏深度,为指导司马煤矿合理利用陷落柱的阻隔水能力提供了科学依据。研究成果为预防和解决陷落柱突水问题提供新的思路和方法,也为相邻矿井实际生产提供指导借鉴意义。
[Abstract]:Collapse column water inrush is a typical problem of mine water inrush caused by abnormal geological structure, and it is also one of the most harmful water inrush situations.For a long time, the research on the water inrush of the collapse column is mainly focused on the rich water conductivity of the collapse column and the mining activation of the collapse column, but there is little research on the water barrier ability of the subsided column itself.The research on the mechanism of water barrier of collapse pillar is not only of great scientific research value, but also of great practical significance to ensure the safe mining and resource saving of coal mine.Combined with the development of floor collapse column in Sima Coal Mine and its water enrichment, this paper makes comprehensive use of theoretical analysis, numerical simulation and laboratory test.The water barrier capacity and mechanism of floor collapse pillar in Sima coal mine are systematically studied by means of field test and other methods.The following research results are obtained: (1) it is clear that the collapse columns in Sima Coal Mine are mostly unconductive or local water-conducting collapse columns and have certain water barrier capacity, and the distribution of subsidence columns in the mine field is more in depth, less in shallow part and distributed in groups.On the basis of the theory of elastic mechanics and fracture mechanics, the failure force model of collapsing column water inrush is established and the stress expression in the column is calculated.Furthermore, the critical water pressure expression of water inrush in caved column is obtained, which is the critical water pressure expression of collapsing column, i.e., the internal compaction of collapsing column is better and has a certain strength in macroscopical level, and the X-ray diffraction fluorescence spectrum is used to analyze the structure of the collapsing column.Mercury injection experiments show that the main components are muddy and siliceous, and the cementation and filling are better, the pore throat distribution is gradually concentrated with the increase of the buried depth, and the permeability becomes worse.The results show that the collapse column has a good water barrier capacity and is gradually becoming stronger. The numerical simulation shows that the failure depth of the complete bottom plate is about 19m, and the failure depth of the floor slab containing the collapse column is about 35m, which is consistent with the measured data of adjacent mines.It can provide guidance for practical production.) the permeability test of indoor collapse column sample and the test of water resistance ability of field collapse column show that the collapsing column has certain water barrier ability, the indoor test reaches 2-2.5 MPA / m, and the field test reaches 1.5-2 MPA / m.Combined with numerical simulation, the failure depth of the floor with collapse columns is obtained, which provides a scientific basis for guiding the reasonable utilization of water barrier capacity of collapse columns in Sima Coal Mine.The research results provide new ideas and methods for preventing and solving the problem of collapse pillar water inrush, and also provide guidance for the practical production of adjacent mines.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD745

【引证文献】