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利用放射性同位素技术观测坝基渗流包括示踪法和稀释法两种方法,在国内尚属首次应用。通过安徽省龙河口水库的现场观测,得到了砂砾石坝基在与土坝粘土心墙和铺盖接触面处的渗透系数值,为研究接触冲刷提供了实测资料;其次,发现坝基内存在一个强透水性夹层,并测出了它的位置和渗透系数值;再次,发现原主河槽系坝基的集中渗流带。这些实测资料对水库坝基进行稳定分析起了十分重要的作用。本文将对这次利用放射性同位素技术观测坝基渗流的基本原理、使用方法、仪器设备及资料整理分析等方面进行介绍。
The use of radioisotope technology to see dam seepage, including tracer method and dilution method are the first time in China. Through the on-site observation of Longhekou Reservoir in Anhui Province, the permeability coefficient of sand-gravel dam foundation at the contact surface between clay dam core and bedding was obtained, which provided the measured data for the contact erosion. Secondly, it was found that there was a strong water-permeable Sexual interlayer, and measured its location and permeability coefficient values; again, found that the main channel system of the Central River dam seepage belt. These measured data play a very important role in the stability analysis of dam foundation. This article will introduce the basic principles, methods of use, equipment and data analysis of the dam foundation seepage using radioisotope technology.