深部采煤采动阶段覆岩运动规律及多因素耦合致灾机理研究

发布时间：2018-05-24 17:54

本文选题：覆岩空间结构 + 岩层运动　；参考：《河北工程大学》2015年硕士论文

【摘要】：伴随着浅部煤炭资源的日益殆尽,深部煤炭开采已成为新时期我国能源保障的重要手段。根据有关资料显示,我国已经探明的深度在1000米以下的煤炭储量达到2.95万亿吨,占煤炭资源总量的53%。但随着煤炭开采深度的不断增加,采场围岩的力学特性也逐渐发生了改变,不仅顶板管理越发困难,冲击地压发生的可能也越来越高,这使得煤炭开采遭受动力灾害的可能越来越大,以地应力为主导的冲击地压事故的防治难度在加大。进入深部开采后,决定矿山压力显现程度的运动岩层在厚度和层面方向上已经超出传统的平面模型范围,所形成的覆岩空间结构的运动影响着采动应力场的分布。本论文重点进行深部复杂条件开采煤岩采动灾害机理及危险性多因素耦合致灾机理方法的研究,针对边界条件为两面采空区和三面采空区(孤岛工作面)采场岩层运动规律,结合数值模拟分析,揭示深部开采煤层覆岩采动阶段多因素耦合灾变机理。首先从宏观角度分析,通过地质条件和开采因素对工作面冲击危险性的影响,确定出工作面在推进过程中可能会发生冲击地压的区域。然后运用多因素耦合致灾机理的研究方法,通过对工作面煤岩结构、地质构造、覆岩空间结构的运动等因素的分析,对每一因素单独分析,划出危险区域,最后通过危险区域可以看到有重叠部分,这些重叠部分危险程度更大,以此,区分危险程度的不同,划分出不同区域。结合工程实例,利用微地震监测结果和力学结果验证采动阶段应力场时空分布规律及多因素耦合致灾机理。
[Abstract]:With the increasing depletion of shallow coal resources, deep coal mining has become an important means of energy security in China in the new period. According to the relevant data, the proven coal reserves below 1000 meters have reached 2.95 trillion tons, accounting for 53% of the total coal resources. However, with the increasing of coal mining depth, the mechanical properties of surrounding rock of stope have gradually changed, not only the roof management is more difficult, but also the possibility of impact ground pressure is higher and higher. As a result, it is more and more likely that coal mining will suffer from dynamic disasters, and it is becoming more difficult to prevent and cure ground burst accidents which are dominated by in-situ stress. After entering deep mining, the thickness and direction of the moving rock layer which determines the degree of mine pressure appearance has exceeded the traditional plane model, and the movement of the overburden spatial structure affects the distribution of the mining stress field. This paper focuses on the study of mining disaster mechanism and hazard multi-factor coupling disaster mechanism of mining rock in complex conditions of deep mining, aiming at the movement law of stope strata in two-face goaf and three-sided goaf (Gudao face) with boundary condition. Combined with numerical simulation analysis, the coupling disaster mechanism of multiple factors in mining stage of overburden rock in deep mining seam is revealed. Firstly, from the macroscopic point of view, through the influence of geological conditions and mining factors on the impact risk of the working face, the area where the impact ground pressure may occur in the working face during the process of propulsion is determined. Then, by using the method of multi-factor coupling mechanism research, through the analysis of coal and rock structure, geological structure, movement of overburden space structure and so on, each factor is separately analyzed, and the dangerous area is delineated. Finally, we can see that there are overlapped parts through the dangerous areas, which are more dangerous. By this way, we can distinguish the different degree of danger and divide the different regions. Combined with engineering examples, microseismic monitoring results and mechanical results are used to verify the temporal and spatial distribution of stress field in mining stage and the mechanism of coupling disaster caused by multiple factors.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD324

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