采深对采场围岩应力壳力学特征影响规律研究

发布时间：2018-05-31 13:40

本文选题：应力壳 + 采深　；参考：《安徽理工大学》2017年硕士论文

【摘要】：本文是在采场围岩应力壳理论的基础上,采用实验室相似模拟、计算机数值模拟相结合的综合研究手段,以淮南矿业集团谢桥煤矿11318E综采工作面为主要工程背景,深入系统的研究了采深对采场围岩应力壳力学特征的影响规律。研究发现,采场矿压显现受控于应力壳的存在和其演化所带来的影响。且随着采深的增加,应力壳的高度先基本不变,采深1000m左右处为拐点,1000m以上时应力壳的形态和力学特征受采深影响显著,壳高随着采深的增加而增加,走向壳基距工作面煤壁距离增大,壳基影响范围也随之变宽,应力壳形态由扁平壳向拱形壳转变。分析了不同采深情况下采场推进过程中的位移变形和围岩破坏特点,得出工作面变形和破坏主要发生工作面煤壁前方一定距离内,且随着开采深度的增大,工作面上覆岩层垂直位移量明显增大,采场围岩破坏范围也随之增大,充分揭示了深部采场工作面围岩变形具有近场效应,且采深越大,围岩变形近场效应越显著。研究结果表明深部矿井应力壳的形成机制仍然明显,深部矿井采场矿压显现仍受控于应力壳的存在和其演化带来的影响。该研究成果进一步揭示了深部采场矿压显现与采深的关系,该研究对深部矿井采场围岩控制、工作面及巷道支护以及动力灾害防治具有指导意义。
[Abstract]:This paper is based on the stress shell theory of surrounding rock of stope, adopts the laboratory similar simulation and the computer numerical simulation to combine the comprehensive research means, taking the 11318E fully mechanized mining face of Huainan Mining Group as the main engineering background. The influence of mining depth on the mechanical characteristics of stress shell in surrounding rock of stope is studied systematically. It is found that stope pressure is controlled by the existence of stress shell and its evolution. With the increase of mining depth, the height of the stress shell is basically unchanged, and the shape and mechanical characteristics of the stress shell are significantly affected by the mining depth when the depth is above 1000 m, and the height of the shell increases with the increase of mining depth. With the increase of the distance between strike base and coal face wall, the influence range of shell base becomes wider, and the shape of stress shell changes from flat shell to arch shell. The characteristics of displacement deformation and surrounding rock failure in the process of stope advance under different mining depth are analyzed. It is concluded that the deformation and destruction of the face mainly occur within a certain distance in front of the coal wall of the working face, and with the increase of mining depth, The vertical displacement of overlying strata increases obviously and the failure range of surrounding rock increases, which fully reveals that the deformation of surrounding rock in deep stope has near-field effect, and the bigger the mining depth is, the more obvious is the near-field effect of surrounding rock deformation. The results show that the formation mechanism of deep mine stress crust is still obvious, and the formation of mine pressure in deep mine stope is still controlled by the existence of stress shell and the influence of its evolution. The research results further reveal the relationship between mine pressure appearance and mining depth in deep stope. This study has a guiding significance for the control of surrounding rock in deep mine stope, support of face and roadway, and prevention and control of dynamic disaster.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD311

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