工程地质学报2017，Vol.25Issue(2)：531-540,10.DOI:10.13544/j.cnki.jeg.2017.02.033
白鹤滩水电站库区小江断裂带活动性研究
ACTIVITIES OF XIAOJIANG FAULT ZONE IN BAIHETAN HYDROPOWER STATION RESERVOIR
摘要
Abstract
The northern section of Xiaojiang fault zone is the largest fracture structure in Baihetan hydropower station reservoir.Its characteristics and activities have a clear impact on migration and relocation near the reservoir.After studies of large scale investigation,fault zone quartz morphology scan and radon survey,the distribution characteristics of Xiaojiang fault zone is defined--from north of Ningnan county,along the left bank of Jinsha River,passing Yongle,Luji,Liugu and extending to the south of Menggu.Quartz micro morphology statistical analysis and stress micro shape show that the fault activity is strong in the late Pleistocene.The facts that there are a quartz grain surface with representatives of the two sliding mode (creep and stick slip) stress micro shape combined,the stress micro shape of corrosion degree,stacking and cutting relationship,show that the fault slipped in the late Pleistocene of at least three sub-periods,at the early stage of the creep,advanced for stick slip.The potential seismic hazard evaluation suggests that possible earthquake magnitude of northern section of Xiaojiang fault zone is Ms6.8～Ms7.1.Therefore,there may be another strong shock in this area in the future.关键词
小江断裂带北段/活动性/石英形貌扫描/氡气测量/应力痕迹微形貌Key words
Northern section of Xiaojiang fault zone/Activity/Fault zone quartz morphology scan/Radon survey/Stress micro-shape分类
天文与地球科学引用本文复制引用
张欣,王运生..白鹤滩水电站库区小江断裂带活动性研究[J].工程地质学报,2017,25(2):531-540,10.基金项目
国家自然科学基金(41521002,41072231),中国地调局项目(1212011220154),地质灾害防治与地质环境保护国家重点实验室自主课题基金(SKLGP2015Z001)资助. （41521002,41072231）
