井下采空区构筑物漏风实测装置研发及应用

Development and application of air leakage measurement device for structure in underground goaf

为了实时动态监测采空区构筑物漏风情况,自主研发了一种井下采空区构筑物漏风实测装置。通过现场实测及应用,研究结果表明:风流从工作面上进风口漏入采空区,而采空区中风流一部分通过与工作面之间的漏风流进入工作面下进风口,在下隅角位置附近形成一个涡流区;另一部分风流穿过沿空留巷构筑物进入留巷内,由于采空区的压实程度不同,采空区侧留巷内漏风速度曲线近似呈"L"型下降;通过收集分析留巷内漏风气体,其结果可反映采空区中瓦斯浓度分布情况,为采空区瓦斯治理提供了一种新的监测技术手段,且能有效地降低采空区瓦斯事故发生率,保证矿井的安全生产。

In order to dynamically monitor the air leakage of the structure in the goaf in real time,an air leakage measurement device for the structure in the underground goaf was developed independently,and the field measurement and application were carried out.The results showed that the air flow leaked into the goaf from the upper air inlet of the working face.In the goaf,a part of the air flow entered the lower air inlet of the working face through the air leakage flow between the goaf and the working face,and a vortex zone formed near the lower corner,while another part of the air flow entered the entry retaining through the structure of gob-side entry retaining,and the curve of air leakage velocity in the entry retaining at the goaf side presented the"L"type decline approximately due to the different compaction degree of the goaf.The leakage gas in the entry retaining was collected and analyzed t,and the results could reflect the distribution of gas concentration in the goaf.It provides a new monitoring technique for the gas control in the goaf,and can reduce the incidence of gas accidents in the goaf effectively,thus ensure the work safety of mine.