高放废物地质处置的岩体深部结构面特征研究——以甘肃北山高放废物地质处置地下实验室工程为例

Geological disposal of high-level radioactive wastebase to study the structural plane of deep rock mass: A case study of geological disposal of high-level radioactive waste used in the underground research laboratory of Gansu Beishan area

岩体深部结构面是岩体工程质量评价、三维地质建模、钻孔水文地质试验和地下实验室工程设计等研究的重要影响因素。甘肃北山新场花岗岩地段已被确定为中国高放废物地质处置地下实验室的推荐场址。基于超声波钻孔电视技术和其他地质资料对场址岩体深部结构面特征开展研究,结果表明:场址内花岗岩体具有很好的完整性,有利于地下实验室的工程建造。场址周边断裂构造纵向延伸范围有限,断裂带规模和横向影响范围随深度增加而逐渐减小。结构面产状特征与区域构造特征相一致,为区域构造特征研究提供了佐证。研究成果为地下实验室工程的开挖设计提供了重要参考依据,并为区域基础地质研究提供参考资料。

Structural plane is an important influencing factor for the rock mass quality,3 D modeling,borehole hydraulic test and engineering design of underground research laboratory. Xinchang rock mass in Beishan area has been chosen as the preferred site for URL on geological disposal of high-level radioactive waste in China. The characteristics of structural plane in Xinchang rock mass were obtained based on acoustic borehole televiewer and other geological information. The results indicate that the granite rock mass with a high massiveness is beneficial for construction of URL. The width of faults around the preferred site and incidence in horizontal and vertical directions decrease with the depth. Characteristics of dip and strike of structural plane are the same as features of other structures in this area. The research results provide meaningful information for design of URL and further geological research.