急斜煤层开采覆岩漏风途径生成演化模拟  

Dynamic Evolution of Air Leakage Channel in Overburden Rocks in Mining Steep Coal Seems

作　　者：邵小平[1] 石平五[1] 

机构地区：[1]西安科技大学能源学院,陕西西安710054

出　　处：《采矿与安全工程学报》2007年第4期453-456,共4页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金资助项目(50274058)

摘　　要：为了解急斜煤层分段放顶煤开采过程中工作面发火成因,采用RFPA2D岩石破裂渐近过程分析软件,对开采中上覆层的破坏进行了数值模拟研究.模拟再现了采动区覆岩裂隙萌生、扩展和贯通的过程.研究表明:工作面上方采空区靠顶板侧岩层首先产生微裂隙.随着下方工作面的开采,裂隙在多次闭合、扩展的反复过程中向浅部方向发展,并最终与地表塌陷过程中形成的向深部方向发展的裂隙贯通,从而形成由地表至工作面上方采空区靠顶板侧的漏风供氧通道,引起采空区发火,给工作面安全生产造成极大损害.堵塞漏风供氧通道以消除采空区残煤自然发火的外部因素有助于急倾斜水平分段放顶煤开采的安全生产.The destruction process of upper-layers was simulated by means of strata failure process analysis system （RFPA2D） in order to make clear the cause of fire in working face in horizontal section top coal caving. The result of numerical simulation shows that fractures of upper-layers have an expanding and penetrating process. The micro fractures are firstly formed in roof above the working face. Along with mining underneath working face, they develop towards shallow direction undergoing repeated closing and opening, and, finally connect with the fractures which were formed in the process of surface subsidence and develop toward the depth. This may form an air supply channel leading to the gob over the working face, easy to result in fire disaster in the gob, damaging the working face. It will cause spontaneous combustion of coal in gobs and the enormous harm for the working face safety in production. Stopping up the air leakage channel is helpful for avoiding coal spontaneous combustion.

关 键 词：水平分段放顶煤 微裂隙 漏风 供氧通道 

分 类 号：TD823[矿业工程—煤矿开采]