Investigation on geochemical influence of grout material on groundwater

Japan Atomic Energy Agency has been conducted a contract study with Ministry of Economy, Trade and Industry (METI) called 'The project for Grouting Technology Development' since 2008. As a part of the study, the monitoring of groundwater chemistry in a pre-grouted area has been carried out for three and half years after pre-grouting in Mizunami URL. The results suggested that the chemical compositions in groundwater affected by pre-grouting were recovered and the period to recover is evaluated about two years around an underground opening. (author)