针对地形条件复杂、车辆振动及输电线等干扰因素较多地区对常规的地震、电磁类勘察方法受影响较大，采空区勘察精度不高的难题，将测氡技术引入铁路工程采空区勘察中。通过现场实验发现采空区有明显氡气异常反映，但不同类型采空区的异常反映有所不同，覆盖层中氡气分布对采空区的氡气异常有所影响，建立了覆盖层氡气浓度背景场值确定方法，提出不同类型采空区的氡气异常判释标准。实践表明，测氡法是一种有效的采空区勘察技术，在上述地区可以弥补地震、电磁类勘察方法受干扰严重的不足。%In view of the low survey accuracy in goaf because of perturbation on seismic and electromagnetic survey in areas with complicated topographic condition and interfered by vehicle vibration and transmission line, radon measurement is introduced in railway engineering. Site test shows that there exists an obvious anomaly over a goaf and the anomalies differ in different goaf on account of the radon distributions in the overburden. Methods are established to determine background concentration of radon distribution in the overburden, and standards are put forward to define the anomalies in different goaf. The results show that radon measurement is a useful detection technology in goaf and compensates for some shortcomings resulted from the perturbations on seismic and electromagnetic survey in the areas mentioned above.
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