测氡技术在裂隙水文地质特征研究中的应用——以西北某中低放废物处置场为例

Application of radon measurement in the study on hydrogeological characteristics of fractures in bedrock——Taking certain low-medium radioactive waste disposal site in northwest China as an example

在地质体中,氡气会沿断层、裂隙等构造面运移至地表,形成氡浓度异常现象。这种现象对分析裂隙的连通导水性具有一定的指示意义。据此,在西北某中低放废物处置场预选区选取了裂隙清晰、存在氡异常现象的基岩区,在测试了环境因素对氡浓度变化影响的基础上,开展了剖面氡浓度测量。根据测量结果,确定了线性氡浓度异常带的走向,并与该区裂隙优势产状及前期水文地质勘探成果对比分析,讨论了测氡技术在裂隙水文地质特征研究中的可行性。

In geological body,the gas radon can migrate to the ground surface along the structure faces such as the faults and the fractures,which comes into being the phenomenon of radon anomaly.The significance of this phenomenon is that it can be used to analyze the connectivity of fractures.Based on this,the field where there are clear fractures and radon anomaly is selected at certain low-medium radioactive waste disposal site in northwest China.After the test for the influence of environmental factors to radon concentration,the profile measurement is carried out.According to the result,the strike of the linear zone which radon anomaly is determined.By comparing with the dominant attitude of fractures and the previous result of hydrogeological investigation,the feasibility of radon measurement in the study on hydrogeological characteristics of fracture is discussed.