摘要
北盘江大桥桥址区地质情况极为复杂,发育不同规模的岩溶,钻探工作仅能查明单孔岩溶发育情况,而综合物探方法能查明桥址区全部岩溶发育情况。在北盘江岩溶地质勘察中,首先采用高密度电法进行地面扫测,圈定规模较大的岩溶发育区;然后在发现岩溶的钻孔中采用钻孔电视技术,准确直观地显示溶洞的深度、规模;再通过跨孔电磁波CT技术查明钻孔间的地质情况及发育的溶洞是否存在延伸性。综合运用物探方法,从地面到井中,结合钻孔资料,不仅能解决钻探“一孔之见”的弊端,而且能相互验证、补充解释,为北盘江大桥的设计施工提供详实的勘察资料。
The Beipanjiang Bridge is featured with complex geological situation and karst of different scales.Drilling can only find out the karst development of a single hole,while the comprehensive geophysical exploration method can discover the karst development of the area.The high-density resistivity was deployed to scan the surface to delineate large karst areas,and borehole television were arranged in the drilling holes to directly uncover the depth and scale of karst caves,before using electromagnetic wave CT to discover the geology of inter-drilling holes and the extensibility of karst caves.From the ground to the well,the integrated use of geophysical exploration methods in combination with drilling data,can not only overcome the limitation of drilling holes,but also enhance mutual verification,supplementary explanation,which can provide detailed survey data for the design and construction of Beipanjiang Bridge.
作者
廖友清
陈致同
刘彦华
Liao Youqing;Chen Zhitong;Liu Yanhua(Hydrogeology and Marine Geological Exploration Institute of Jiangsu Province,Huai′an 223400,Jiangsu,China)
出处
《地质学刊》
CAS
2020年第1期185-191,共7页
Journal of Geology
基金
国家自然科学青年基金项目“基于区域分解的大地电磁三维快速正反演研究”(41404057)。
关键词
岩溶地质勘察
高密度电法
电磁波CT
钻孔电视
北盘江大桥
贵州六盘水
karst geological exploration
high-density resistivity
electromagnetic wave CT
borehole TV
Beipanjiang Bridge
Liupanshui
Guizhou
