煤柱稳定性的推进速度效应研究

发布时间：2018-07-08 11:59

本文选题：煤柱稳定性 + 推进速度效应　；参考：《太原理工大学》2017年硕士论文

【摘要】：煤柱稳定性是矿井安全高效生产面临的一大课题,稳定的煤柱对煤矿开展回采、掘进、开拓工作具有重要意义。随着矿井设备的更新发展,工作面推进速度变得越来越快,这对于留设煤柱的稳定性势必造成影响。本文在学习借鉴已有研究成果基础上,首先从理论角度分析了煤柱稳定性影响因素、破坏机理、煤柱受力问题;其次通过不同加载速率条件下的煤岩的力学特性试验研究了相应规律;最后以高阳矿21103工作面为工程背景,运用数值模拟软件进行了模拟研究。主要得到的结论如下:(1)通过不同加载速率条件下煤岩力学特性试验,得到了煤岩在不同加载速率下的力学特性规律。煤岩抗压和抗拉强度具有随加载速率增加而增大的趋势,且通过实验数据分析拟合了煤岩抗压和抗拉强度强度与加载速率的关系曲线并得出了拟合公式;煤岩的剪切峰值强度随法向应力的增加而增强,并保持线性增长的的趋势;煤岩剪切角度的改变也改变了剪切强度的变化趋势;在剪切角度为45°和55°时,剪切峰值强度与剪切速率的关系呈下降趋势。剪切角度为65°时剪切强度随加载速率的增加呈现出了增强的趋势;煤岩剪切试验过程中的应力应变曲线均表现出了不同于硬岩的曲线特征。(2)加快工作面的推进速度减少了工作面走向方向煤体边缘的塑性区,煤体竖直方向主应力峰值随之增加。加快工作面推进速度对侧向煤体塑性区影响较小,煤体内峰值应力位置由普速下距煤壁10m移向了6m左右的位置。本文研究成果对于煤矿煤岩力学特性的科学认识和高产高效绿色发展具有一定意义和指导价值。
[Abstract]:The stability of coal pillar is one of the most important tasks in the safe and efficient production of coal mine. The stable pillar is of great significance to the development of mining, excavation and development of coal mine. With the development of mine equipment, the speed of coal face advancing becomes faster and faster, which will affect the stability of coal pillar. On the basis of studying and drawing lessons from the existing research results, this paper first analyzes the influencing factors of coal pillar stability, the failure mechanism and the bearing force of coal pillar from the theoretical point of view. Secondly, the corresponding laws are studied by testing the mechanical properties of coal and rock under different loading rates. Finally, the numerical simulation software is used to simulate the 21103 face of Gaoyang Coal Mine. The main conclusions are as follows: (1) through the tests of the mechanical properties of coal and rock under different loading rates, the mechanical properties of coal and rock under different loading rates are obtained. The compressive strength and tensile strength of coal and rock have the tendency of increasing with the increase of loading rate. The curve of relation between compressive strength and tensile strength of coal and rock and loading rate is fitted by the experimental data and the fitting formula is obtained. The peak shear strength of coal and rock increases with the increase of normal stress and keeps the trend of linear increase. The change of shearing angle of coal and rock also changes the changing trend of shear strength, and when the shear angle is 45 掳and 55 掳, The relationship between shear peak strength and shear rate is decreasing. When the shear angle is 65 掳, the shear strength increases with the increase of loading rate. The stress-strain curves in the process of coal and rock shear tests are different from those of hard rock. (2) accelerating the speed of working face can reduce the plastic zone of coal body edge in the direction of coal face, and the peak value of vertical principal stress of coal body will increase. Accelerating the speed of working face has little influence on the plastic zone of lateral coal body, and the position of peak stress in coal body moves from 10 m to about 6 m from the normal velocity to the coal wall. The research results in this paper have certain significance and guiding value for the scientific understanding of coal and rock mechanical characteristics and the development of high yield and high efficiency green.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322

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