可控源音频大地电磁法探测中深老窑采空区技术

Controlled source audio-frequency magnetotelluric method to detect goaf in middle and deep old kilns

通过探明榆林地区中深老窑采空区,为老窑采空区治理奠定了基础。选取了典型的中深矿井庙渠煤矿、兴维煤矿作为可控源音频大地电磁法探测试验场地。对试验区进行了干扰试验、参数试验等,确定了背景噪声范围,优化了发射电流、测量频段等施工参数,并确定了现场应用采集参数,测量频带为9600~4 Hz,AB发射极距为840 m,最小收发距为8.9 km,发射电压为700~850 V,发射电流为15 A,点距为30 m。根据优化后的参数,采用可控源音频大地电磁法,利用优化参数对庙渠煤矿3煤采空区的分布情况进行了探测,推断有1处高阻异常区域分布在庙渠和兴维矿区上,主要集中在庙渠矿区,面积较大,分布范围广,推断为3煤采空区,在庙渠矿区的面积约0.234 km^(2),并经钻孔验证,验证效果较好。

Through the exploration of the mined out area of medium and deep old kilns in Yulin area,it lays a foundation for the treatment of the mined out area of old kilns.The typical middle and deep mines Miaoqu Coal Mine and Xingwei Coal Mine are selected as the test site of controllable source audio frequency magnetotelluric method.The interference test and parameter test are carried out in the test area,the background noise range is determined,the construction parameters such as emission current and measurement frequency band are optimized,and the field application acquisition parameters are determined.The measurement frequency band is 9600~4 Hz,the AB emitter distance is 840 m,the minimum transceiver distance is 8.9 km,the emission voltage is 700~850 V,the emission current is 15 A,and the point distance is 30 m.According to the optimized parameters,the controllable source audio frequency magnetotelluric method is used to detect the distribution of No.3 coal goaf in Miaoqu Coal Mine.It is inferred that there is a high resistance abnormal area distributed in Miaoqu and Xingwei mining areas,which is mainly concentrated in Miaoqu mining area,with a large area and wide distribution range.It is inferred that it is No.3 coal goaf,with an area of about 0.234 km^(2) in Miaoqu mining area.It is verified by drilling that the verification effect is good.