摘要
中国散裂中子源(CSNS)项目可行性工程地质勘察阶段,在场地部分区域发现了大范围低阻带异常现象,通过分析场址工程地质条件,认为主要与花岗岩和变质岩的接触带有关,推测低阻是由侵入接触带破碎、富水导致。随后工程地质初步勘察阶段完成的钻探、超声波测井资料表明:接触带并没有富水迹象,而高密度电法低阻异常主要是由花岗岩侵入接触带岩体中富含的黄铁矿(FeS2)所致。
In the engineering geological investigation for the feasibility study of China Spallation Neutron Source （CSNS） Project,it was found that some abnormal low resistivity zones existed in the part area of the site.After analyzing the field engineering geological conditions,the contact zone structure of the granite and metamorphic rock was regarded as the main reason for the abnormity,and it was firstly inferred that the crushing and the groundwater in the intrusive contact zones were the direct reason of the low resistivity.The data from the drilling and the ultrasonic tests indicated that there were not abundant groundwater but the plentiful pyrite existed in the contact zones.So the abnormity of the low resistivity with the high density resistivity method is caused by the abundant pyrite（FeS2）in the intrusive contact zones of granite
出处
《工程勘察》
CSCD
北大核心
2009年第1期90-93,共4页
Geotechnical Investigation & Surveying
关键词
侵入接触带
高密度电阻率法
异常分析
Intrusive contact zone
high-density resistivity method
abnormal characteristics analysis
