This paper describes the results of microfine cement grouting as countermeasure against leakage of rock tunnel in Korea. In this study of field experiments has been performed at the mountain tunnel for electrical cables located in sourthern seoul of Korea. The results of permeability is decreased from 1.03x10~(-4)cm/sec to 4.71x10~(-6) cm/sec. And then by using micro fine cement developed in Korea, cement grouting is successfully performed at this tunnel construction for the electrical cables.
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