基于同位素测氡的煤矿火区圈划方法对比研究

Comparative study of coal mine fire areas zoning methods based on isotopic radon measurement technique

为确定基于同位素测氡的地下火区异常区域圈划的最优计算方法,首先,在分析3种常用区域数据处理方法(传统统计法、趋势面分析法及分形法)的原理基础上,应用这3种方法处理实际矿井地面的测氡数据;然后,利用3种方法圈划火区的结果,从强化弱异常的能力和异常下限的确定2方面对比分析3种方法的差异性;最后,通过选取代表性的钻孔,验证3种方法确定的异常区域。结果表明:传统统计法和分形法的氡异常下限分别为5982和7094 Bq/m^(3),趋势面分析法是通过正剩余分量确定异常区域的,没有具体的异常下限值;3种方法圈划的异常区域面积大小与强化弱异常能力的高低一致:趋势面分析法>分形法>传统统计法;通过对比钻孔验证的结果,确定以分形法所圈划的结果作为后期火区治理的依据。

In order to determine optimal calculation method for identification of abnormal temperature areas,firstly,three commonly used regional data processing methods(traditional statistical method,trend surface analysis method and fractal method)were applied to process radon measurement data of actual mine surface.Then,differences of three methods were compared and analyzed from ability of strengthening weak anomalies and determination of outlier threshold.Finally,representative boreholes were selected to verify anomaly areas determined by the three methods.The results show that the lower limits of radon anomaly of traditional statistical method and fractal method are 5982 Bq/m^(3) and 7094 Bq/m^(3) respectively,and trend surface analysis method is used to determine anomaly area by positive residual component.In delineating abnormal areas according to its consistency with ability of strengthening weak anomalies,the three methods rank as trend surface analysis method>fractal method>traditional statistical method.By comparing results of drilling verification,it is determined that results delineated by fractal method can be used as basis for later fire-fighting activities.