摘要
当煤矿自矿区采出时,采空区上覆岩层会发生变形破坏,一方面煤矿资源会向裂隙发育部位运移,另一方面则存在一定的矿区安全隐患。为了保证煤矿开采工程的安全性,准确掌握矿产运移分布情况,本文采用了关键层理论和数值模拟的方法,以此分析采动覆岩的裂隙演化规律。研究结果显示,裂隙在走向和倾向上呈现出"梯形台"发育特征,在采空区上方裂隙呈现出中部压实、四周发育的"O"形圈分布;在采空区边缘形成卸压区域,此区域裂隙发育,具有较好的抽采效果。除此之外,采空区中部压实区域宽度范围为175m,裂隙不发育,离层率趋于0;采空区进风巷侧35m、回风巷侧30m范围内离层率较大,最大离层率达到了136mm/m。本文通过数值模拟得到了平煤十三矿采动覆岩的裂隙演化规律,这不仅为煤矿资源抽采提供了理论依据,而且为煤矿安全事故防治工作提供了保障。
When the coal mine is mined out from the mining area,the overlying strata of the goaf will be deformed and damaged.On the one hand,the coal resources will migrate to the fracture developed parts.On the other hand,there are some hidden dangers in the mining area.In order to ensure the safety of coal mining engineering,and accurately grasp the distribution of mineral migration,this study adopts the key layer theory and numerical simulation method to analyze the fracture evolution law of mining overburden.The results show that the fracture presents the“trapezoidal platform”development characteristics in the strike and tendency,and the fractures above the goaf present an“O”ring distribution with compaction in the middle and developed around;the pressure relief area is formed at the edge of the goaf,and the fracture is developed in this area,which has good pumping effect.In addition,the width of the compaction area in the central part of the goaf is 175 m,the fractures are not developed,and the separation rate tends to zero;the separation rate is larger within the range of 35 m at the side of air inlet roadway and 30 m at the side of return air roadway,and the maximum separation rate reaches 136 mm/m.This study obtains the law of fracture evolution of mining overburden in Pingdingshan No.13 coal mine through numerical simulation,which not only provides a theoretical basis for coal mine resource extraction,but also provides a guarantee for coal mine safety accident prevention and control.
作者
孙米银
SUN Miyin(No.13 Coal Mine of Pingdingshan Tian an Coal Industry Co.,Ltd.,Xuchang 461714,China)
出处
《中国矿业》
2021年第5期180-187,192,共9页
China Mining Magazine
关键词
采动覆岩
裂隙演化
关键层理论
数值模拟
mining overburden
fracture evolution
key layer theory
numerical simulation
