基于电磁波CT技术的德厚水库帷幕地质情况分析

德厚水库工程大部分位于碳酸盐岩地区,岩体破碎带、溶洞、溶隙、溶管等不良地质体发育。通过采用组合频率与非固定观测系统相结合的方法,解决了电磁波CT技术在岩溶地区测试所面临的因孔间距过大导致电磁波穿透介质困难的问题。根据电磁波CT反演的岩体吸收系数剖面编制工区地质解译图,推断工区范围内岩溶、岩体破碎带等不良地质构造发育规模及分布范围,分析德厚水库帷幕地质情况,为保证库盆防渗工程质量发挥作用。

Curtain geological condition analysis of Dehou Reservoir based on electromagnetic wave CT technology

Dehou Reservoir is mostly located in carbonate rock area, where many adverse geological bodies such as broken rock mass, karst cave, solution crack and pipe develop. We solved the problem ,i. e. ,electromagnetic wave CT technology al-most couldn't penetrate the medium for the large hole spacing, by using the composite frequency and non-fixed observation sys-tem in karst area. According to the absorption coefficient profile of the rock mass based on electromagnetic wave CT inversion, we compiled a geological interpretation map for the work area, inferred the development scale and distribution range of adverse geo-logical bodies ( karst, broken rock mass,etc. ) , and analyzed the curtain geological condition of Dehou Reservoir. The research plays an important role in ensuring the quality of reservoir basin anti-seepage engineering.