Abstract
Abstract Calcium carbonate (CaCO3) precipitation in tunnel drainage system poses serious problems to railway tracks. In this study, the calcification phenomenon identified in Meyssiez tunnel was analyzed through laboratory testing and site water monitoring. In particular, the surrounding soils were investigated in the laboratory. Site water table was regularly monitored in the field and site water was taken for laboratory analyses in terms of pH and electrical conductivity (EC). Examination of the test results showed that the calcification phenomenon was mainly induced by the calcium carbonate dissolution in the fine fractions (d
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