利用电磁方法探测内蒙古塔木素高放废物预选场址岩体的内部构造

Probing inner structure of rock mass at a high-level radioactive preselected site in Tamusu,Inner Mongolia

高放废物地质处置库选址要求围岩完整稳定,它与岩体深部地质结构密切相关,因此是场址评价中必须考虑的因素.在高放废物储库选址新区内蒙阿拉善塔木素岩体,采用可控源音频大地电磁法进行了剖面探测.分析了典型测深曲线,区分了地质构造和完整围岩的响应特征;针对高放废物预选场址的特点,对原始数据进行了处理;结合已有地质、钻井及测井资料完成了解释;结果表明,利用可控源音频大地电磁法有效地查明了该地岩体内部结构,该岩体存在裂隙和破碎,完整性欠佳.

The surrounding rock of a high-level radioactive waste geological disposal repository is required to be intact and stable,which is related with the deep geological structure of rock mass,that thus should be considered in the site evaluation process.To obtain such information of the subsurface,controlled source audio frequency magnetotelluric method（CSAMT）was applied to probe the Tamusu rock mass in Alxa,Inner Mongolia,which is a new site for waste repository.We analyzed the typical sounding curves,and identified the responses that are characteristics of geological structures and intact rock.The obtained profiles and sections were interpreted in combination with the available geological and logging data.The results show the existence of fractures and broken rocks within the study area.This study confirms the effectiveness of CSAMT method as a geophysical tool which could be used to characterize the geological structures in-situ at a high-level radioactive waste preselected site.