Evaluation method of spring water in tunnel using by statistical analysis of water quantity and chemical analysis

Abstract

Spring water in tunnel have an influence on tunneling. Some investigation and analysis were carried on to estimate the quantity of spring water and to forecast the locality have large underground water, on the escape tunnel of Hakamagoshi Tunnel which was excavated by TBM.
The result of this study were as follows.
1) The quantity of water spring in tunnel over the whole tunnel was estimated by statistical analysis of the water quantity date on excavated section of the tunnel.
2) The locality which have large underground water were forecast by geological data.
3) A changing of water quantity was evaluated by chemical analysis of water.