摘要
急斜特厚煤层采空区顶板垮落特征和缓斜煤层不同,容易形成悬空顶板,从而诱发动力灾害。以乌鲁木齐乌东煤矿北采区45°煤层为背景,通过地质雷达对采空区顶板的塑性区变化特征实施综合立体探测。探测结果表明:随工作面的推进,采空区顶板没有发生较大的垮落,形成悬空顶板。提出对采空区顶板实施井下注水与爆破耦合致裂以及地表深孔爆破相结合的致裂方案。现场采用微震监测得出,顶板致裂方案有效减少了采空区顶板突然垮落所造成的动力灾害发生的频次。
The collapse characteristics of roof in the goaf of steep and extra thick coal seam are different from that of gentle slope coal seam, and it is easy to form a suspended roof to induce dynamic disasters. Based on the 45° coal seam in the northern mining area of Wudong Coal Mine in Urumchi, a omprehensive three-dimensional exploration was carried out by using the ground penetrating radar to analyze the changing characteristics of the plastic zone in the roof of the goaf. The detecting results showed that the roof of the goaf did not collapse greatly with the advancement of the working face, and the suspended roof was formed.This paper proposes a scheme of cracking on roof of goaf by combining underground water injection with blasting and deep hole blasting in surface. The microseismic monitoring results show that the weakening of the roof effectively reduces the frequency of dynamic disasters caused by the sudden collapse of the roof of the goaf.
作者
李云鹏
侯永鹏
LI Yunpeng;HOU Yongpeng(Department of Mine Engineering,Yantai Gold College,Yantai 255401,China)
出处
《煤矿安全》
CAS
北大核心
2018年第12期139-142,146,共5页
Safety in Coal Mines
关键词
急斜特厚煤层
地质雷达
顶板致裂
深孔爆破
微震监测
steeply inclined and extremely thick coal seam
ground penetrating radar
roof fracturing
deep hole pre-splitting blasting
microseismic monitoring
