摘要
煤层采空后容易富集氡气,而上覆岩层裂隙及断层等构造又有利于氡气上移,因此探测氡气异常可以确定采空区。在山西省吕梁地区临县某工作区,利用氡气放射性测量,并结合瞬变电磁方法,有效的解释了该区采空区的范围。该区共布设氡气测线19条,测点634个。经统计计算氡气平均值为8.84,解释异常阈值为12.58。通过介绍已知采空区氡气放射性曲线特征及典型测线瞬变电磁电阻率断面与氡气放射性曲线对比,分析其不同地质条件下氡气解释范围出现的原因。根据该区氡气测量等值线平面图与3号煤顺层视电阻率等值线平面图的解释结果,确定了该区4个采空区的位置及范围,该结果在后来的生产过程中都得到了验证。
After coal seams worked out, the area is easy to enrich radon gas, while overburden fractures and faults are propitious to radon migrate upward, thus to detect radon anomaly can determine gob area range. In a working area in the Linxian County, Luliang Prefecture, Shanxi Province has used radon radioactivity measurement, combined with TEM, and interpreted the range of gob in the area effectively. In the area totally has laid out 19 radon measurement lines, 634 survey stations. After statistical calculation, the average radon value is 8.84, interpretation anomaly threshold is 12.58. Through the introduction to known radon radioactivity curve features and contrast of typical measurement line TEM resistivity section and radon radioactivity curve have analyzed the causation of radon interpretation ranges appearing under different geological conditions. Based on interpreted results from radon measurement isogram and coal No.3 bedding apparent resistivity isogram determined position and range of 4 gobs in the area. The results have verified during subsequent production processes.
出处
《中国煤炭地质》
2015年第10期70-75,共6页
Coal Geology of China
