近距离煤层工作面自然风压变化及漏风规律研究

Study on Natural Wind Pressure Change and Air Leakage Law in Short-distance Coal Seam Working Face

为查明沙吉海煤矿在自然风压影响下采空区漏风规律,通过测定矿井不同季节自然风压变化情况及B1003W03工作面在自然风压影响下的漏风量,利用数值模拟采空区漏风规律。测定结果表明:沙吉海煤矿矿井自然风压春秋冬季时为正,最大为冬季时的135 Pa,即自然风压方向与风机作用方向一致,有助于矿井通风,但同时会增加采空区漏风量;夏季自然风压最小值为-37 Pa,一天之内随气温变化为先正后负再正,是采空区形成“呼吸”效应的原因;全年自然风压波动幅度达172 Pa。

In order to find out the law of air leakage in goaf under the influence of natural wind pressure in Shajihai Coal Mine,by measuring the change of natural wind pressure in different seasons and the amount of air leakage in the B1003W03 working face under the influence of natural wind pressure,the law of air leakage in goaf is simulated numerically.The results show that the natural wind pressure in Shajihai Coal Mine is positive in spring,autumn and winter,the maximum is 135 Pa in winter,that is,the direction of natural wind pressure is consistent with the action direction of fan,which is helpful to mine ventilation,but at the same time,it will increase the air leakage in goaf,and the minimum value of natural wind pressure in summer is-37 Pa,which changes from positive to negative and then positive with air temperature in one day,which is the reason for the"breathing"effect in goaf.The fluctuation range of natural wind pressure in the whole year is 172 Pa.