沿空留巷“Y”型通风条件下采空区漏风测试及分析

在利用束管采样系统长期监测采空区气体变化的基础上,结合瞬时释放SF6示踪气体技术,对凤凰山矿首个采用沿空留巷"Y"型通风的154307工作面采空区漏风状况进行了测试。结果表明,沿空留巷"Y"型通风条件下采空区漏风范围较广,漏风量大。采空区距工作面400 m范围内,O2浓度在20%左右,漏风风速0.027～0.075 m/s,为风速急变区;距离工作面400 m以外,O2浓度在16%左右,漏风风速为0.017～0.024 m/s,为风速变缓区。

The Test and Analysis of Gob Air Leakage in Gob-side Entry Retaining with Y-Type Ventilation Condition

Based on the long-term continuous detection of the gas change in gob by using beam tube monitoring system,combined with SF6 tracing gas technology,the air leakage condition in gob was tested on No.154307 workface of Fenghuangshan coal mine which firstly using gob-side entry retaining with Y-type ventilation.The results indicated that the air leakage scope in gob was wide and the amount of air leakage was large in gob-side entry retaining with Y-type ventilation.Within a distance of 400 m to the workface,the oxygen content was about 20% with air leakage velocity of 0.027~0.075 m/s,being a rapid change area of wind speed.At a distance over 400 m to the workface,the oxygen content was about 16% with air leakage velocity of 0.017~0.024 m/s,being a slow change area of wind speed.