色连二矿软岩工程地质特征及围岩开挖数值模拟研究

发布时间：2018-03-03 09:15

本文选题：色连二矿　切入点：软岩　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着煤炭开采不断向深部发展,软岩的工程地质问题一直困扰着我国西部煤矿的安全生产,特别是西部中生代盆地的胶结差、低膨胀性、遇水泥化这类软岩,矿山巷道在掘进过程中的稳定性评价尚缺乏可靠依据。因此,对研究区软岩巷道围岩稳定性进行分析及评价,从而为深部支护设计与资源的合理开采提供科学参考具有重要的实践意义。本文在分析色连二矿水文工程地质条件、岩石物理力学特性及围岩性质和微观组分的基础上,结合井筒以及巷道工程地质的实际调查,明晰了巷道变形失稳特征及影响软岩巷道围岩稳定性的主控因素：即由于矿区软岩成岩时代晚、岩石成熟度低、软岩中含有大量的粘土矿物等亲水性物质,以致岩石在遇水条件下软化甚至泥化,使得围岩的强度急剧弱化,从而导致围岩的变形失稳破坏。并分别运用集对理论、BP神经网络和灰色关联度等方法对矿区3条典型的软岩巷道进行了围岩稳定性评价,结果表明：矿区软岩巷道在遇水软化前,属于基本稳定型。在此基础上,运用FLAC3D软件,模拟对比分析了渗流与无渗流、软化与未软化、支护与未支护等方案下软岩巷道开挖后围岩应力、塑性区、位移等变化特征,各数值模拟方案对比分析表明：软岩巷道在渗流条件下和遇水软化后都不同程度的加剧了围岩的塑性破坏,但水对围岩稳定性的主要影响因素是对软岩的力学弱化作用,且支护有效的控制了软化渗流导致的围岩破坏。研究结果对指导含水层下软岩巷道的掘进和支护设计提供了一定的科学依据,有一定的借鉴意义。
[Abstract]:With the continuous development of coal mining to the deep, the engineering geological problems of soft rock have been perplexing the safe production of coal mines in western China, especially the poor cementation, low expansion and cement of the Mesozoic basins in the western China. The stability evaluation of mine roadway in the process of excavation is still lack of reliable basis. Therefore, the stability of surrounding rock of soft rock roadway in the study area is analyzed and evaluated. Therefore, it is of great practical significance to provide scientific reference for deep support design and rational exploitation of resources. Based on the analysis of hydrological engineering geological conditions, physical and mechanical characteristics of rock and surrounding rock properties and microscopic composition of Xilian No.2 Mine, this paper combines with the actual investigation of the engineering geology of shaft and roadway. The characteristics of roadway deformation and instability and the main controlling factors affecting the stability of soft rock roadway surrounding rock are clarified: that is, due to the late diagenetic age of soft rock in mining area, the low maturity of rock, the soft rock contains a large amount of hydrophilic substances such as clay minerals. As a result, the rock softens or even muddies under the condition of water, which weakens the strength of the surrounding rock. The method of set pair theory BP neural network and grey correlation degree are used to evaluate the stability of surrounding rock in three typical soft rock roadways in mining area. The results show that the soft rock roadway in mining area belongs to the basic stable type before softening in water. On this basis, by using FLAC3D software, the variation characteristics of surrounding rock stress, plastic zone and displacement of soft rock roadway after excavation are simulated and analyzed, such as seepage and no seepage, softening and unsoftening, supporting and unsupporting, etc. The comparative analysis of various numerical simulation schemes shows that the plastic failure of surrounding rock is aggravated to varying degrees in soft rock roadway under seepage condition and after water softening, but the main influence factor of water on the stability of surrounding rock is the mechanical weakening of soft rock. And the support can effectively control the surrounding rock damage caused by soft seepage. The research results provide a certain scientific basis for guiding the excavation and support design of soft rock roadway under the aquifer, which has certain reference significance.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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