近距离煤层同采采空区自然发火防治技术研究

发布时间：2018-04-27 09:24

本文选题：近距离煤层 + 协调同采　；参考：《中国矿业大学（北京）》2015年博士论文

【摘要】：近距离煤层群在我国广泛赋存。近距离煤层群在同时开采的过程中，邻近层采空区之间易形成大量裂隙通道而发生漏风现象，从而使采空区内气体运移规律与单层开采情况会有所不同，采空区自然发火危险性区域的难以准确确定，给采空区自燃预防和防治带来了极大困难。论文针对南阳坡3#、4#煤层近距离上下协调同采，进行了现场应力分布测试，同时借助数值计算软件进行解算确定了合理错距。上下煤层之间产生大量相连通的裂隙，存在煤层间漏风，煤层自燃危险区域的分布规律也更加复杂。基于此进行了渗透系数实验，在合理假设的基础上建立了采空区气体流动数学模型。基于上限风速、下限氧浓度指标体系，建立了采空区危险性区域判定机理。借助数值数值计算软件COMSOL Multiphysics对采空区流场进行了解算。通过设定不同错距，对上下煤层采空区流场进行了数值模拟，得出了错距与采空区危险区域的关系式。基于矿压显现规律，结合采空区自燃带的宽度，对上分层采空区采取了注氮防灭火技术。通过计算与现场监测，，基于煤层自然发火期和工作面回采速度确定了经济合理的注氮量。根据现场设备注氮能力，确定了上下同采的合理错距为89m，既保证了安全回采和矿井产量，又达到了防止采空区遗煤氧化自燃的发生，取得了良好的经济和社会效益。
[Abstract]:The close range coal seam group exists widely in our country. In the process of mining at the same time, a large number of fissure channels are easily formed between the goaf of the adjacent layer, which makes the gas migration in the goaf different from that of the single layer mining, and the area of the spontaneous combustion danger Zone in the goaf is difficult to be accurately determined. The prevention and control of spontaneous combustion in the air zone has brought great difficulties. In this paper, according to the close range of the 3# and 4# coal seam in the Nanyang slope, the distribution of the stress distribution is measured. At the same time, the reasonable error is determined by the numerical calculation software. There are a large number of connected cracks between the upper and lower coal beds, the leakage of coal seam and the dangerous zone of spontaneous combustion of coal seam. The distribution law of the domain is also more complex. Based on this, the permeability coefficient experiment is carried out and a mathematical model of the gas flow in the goaf is established on the basis of the reasonable hypothesis. Based on the upper limit wind speed and the lower oxygen concentration index system, the hazard regional determination mechanism of the goaf is established. The calculation software COMSOL Multiphysics is used to calculate the goaf flow with the numerical value value. Through setting the different staggered distance, the flow field in the goaf of the upper and lower coal seam is numerically simulated, and the relation between the fault distance and the dangerous area of the goaf is obtained. Based on the law of the ore pressure and the width of the spontaneous combustion zone in the goaf, the nitrogen injection and extinguishing technology is adopted in the upper stratified goaf. The natural ignition period and the working face recovery speed determine the reasonable amount of nitrogen injection. According to the capacity of nitrogen injection in the field equipment, the reasonable error distance of the same mining is determined to be 89m, which not only ensures the safety recovery and the mine production, but also prevents the spontaneous combustion of the coal oxide from the coal in the goaf, and has obtained good economic and social benefits.

【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TD752.2

【参考文献】