JUDGING METHOD AND JUDGING DEVICE FOR STABILITY OF UNDERGROUND STRUCTURE

摘要

PROBLEM TO BE SOLVED: To easily judge stability to the infiltration of seawater in an under ground structure such as a submarine tunnel where leak of water including seawater exists. SOLUTION: Flow of leaking water and concentration of sodium ions are measured through the year to be taken as basic data. When the flow of leaking water is within a range of the basic data, with the concentration of sodium ions deviated from a range of the basic data, it is judged that stability of the under ground structure is deteriorated.