158kHz工作频率在煤层工作面坑透探测中的应用

目前使用的坑透仪工作频段主要集中在300kHz～1 500kHz,该频段对于工作面较宽的煤层或地质条件比较复杂的煤层存在穿透效果较差的缺点。对于大面宽综采工作面（〉200m）,需采用较低频率的坑透仪探测。在淮北某矿366综采工作面的无线电波透视中,选择工作频率158kHz进行测试。应用结果表明该工作频率可以成功圈出工作面存在的地质异常区域。通过与巷道已揭露地质质构造位置进行对比分析,158kHz频率比365kHz频率的探测成果对断层影响区的划分更加准确可靠,说明158KHz坑透对于较宽的工作面和地质条件复杂的煤层工作面探测效果较好。

Application of 158 KHz Operating Frequency in Coal Face Radio-wave Penetration Detection

The operating frequency range of radio-wave penetration apparatus is mainly concentrated within 300 KHz～1500 KHz at present, this frequency range has shortcoming of poor penetration effect in case of coal seams with wider working face or complicated geological condition. Thus for wider fully mechanized coal face （〉200m） needs radio-wave penetration apparatus with lower frequency. In radio-wave penetration detection at the No.366 fully mechanized working face of a Huainan coalmine, operating frequency of 158KHZ has been selected. The application has demonstrated that this operating frequency can circle out working face geological anomaly area successfully. Through contrastive analysis of the results and geological structure situation revealed by roadways, the detection results of 158 KHZ operating frequency are more accurate and reliable than that of 365 KHz operating frequency in fault impacting area delineation. Thus the detection effect of 158 KHZ frequency is propitious to wider working face and complicated geological condition cases.