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Development of the borehole television system using the fluorescent technique

使用荧光技术开发钻孔电视系统

基本信息

批准号：
09555320
负责人：
NISHIYAMA Takashi
金额：
$ 5.95万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555320/
关键词：
fluorescent technique borehole television system image processing microcrack ultraviolet light boring grouting

项目摘要

It is very difficult to identify microcracks using conventional borehole television systems, because there are no characteristic differences in microcracks from other materials of rocks. Therefore, we applied the fluorescent technique, which is widely used to examine microcracks and pore spaces under a microscope for the borehole television system.A new circular ultraviolet lamp was designed to observe microcracks inside boreholes. Many hidden microcracks that were not recognized by a conventional borehole television were disclosed under ultraviolet light, in the laboratory setting. The fluorescent approach was performed for visualization of grouting processes. The distributions of various grout mixtures containing fluorescent substances were clearly visualized under ultraviolet light, using a borehole television system.Two field tests, evaluation of a loosened zone in a rock mass caused by widening of the Maiko Tunnel in Hyogo prefecture and analysis of grouting mechanisms in the limb tunnel of Yokotake Dam in Kyushu, were carried out. Formation of new microcracks and/or progression of microcracks inside boreholes were observed after widening of the tunnels. Many microcracks filled with grout mixed with three different coloring substances were clearly visualized under ultraviolet light using this system.It is concluded that the borehole television system combined with the fluorescent technique has been successfully developed and is very useful for identification of microcracks or grout containing fluorescent substances inside horeholes.

使用传统的钻孔电视系统很难识别微裂纹，因为微裂纹与其他岩石材料没有特征差异。因此，我们在钻孔电视系统中应用了广泛用于在显微镜下检查微裂纹和孔隙空间的荧光技术。设计了一种新型圆形紫外灯来观察钻孔内的微裂纹。在实验室环境中，在紫外线照射下，许多传统钻孔电视无法识别的隐藏微裂纹被揭示出来。荧光方法用于灌浆过程的可视化。使用钻孔电视系统，在紫外线下可以清楚地看到含有荧光物质的各种灌浆混合物的分布。进行了两项现场试验，评估兵库县舞子隧道拓宽造成的岩体松动带，以及分析九州横竹水坝肢端隧道的灌浆机制。隧道拓宽后，观察到新的微裂纹的形成和/或钻孔内微裂纹的进展。利用该系统，在紫外光下可以清晰地看到许多充满混合了三种不同颜色物质的水泥浆的微裂缝。结论是，结合荧光技术的钻孔电视系统已经成功开发出来，对于识别井眼内含有荧光物质的微裂缝或水泥浆非常有用。