钻孔电磁波CT技术在帷幕灌浆检测中的应用

Application of borehole CT technology in grouting curtain check

某水库蓄水后,附近矿井巷道发生大规模涌水,推测防渗帷幕线封闭不好,疑有岩溶或破碎带渗透通道。为探明此渗透通道,采用钻孔电磁波CT技术,对帷幕灌浆处理效果进行了检测,在现场检测的两个剖面中发现了6处异常区。结合地质资料和测试数据分析,推测出主渗通道,并经高压帷幕灌浆处理后证实该分析结果正确。介绍了钻孔电磁波CT技术的基本原理和处理方法,并对该方法的应用条件和范围进行了探讨。

Large scale leakage was found in a mine tunnel after impoundment of a nearby reservoir.It was speculated that the grouting line was not closed and karst or fracture zone might exist.Borehole CT technology was applied to check the grouting quality and 6 abnormal zones were found in 2 checked sections.The main leakage passages were speculated according to the geological data and CT analysis,and the speculation was proved by high pressure grouting later.We present the main principles and treatments of borehole CT,and discuss the application condition and range.