... investigations alone. This means construction plans are often modified in response to unexpected geological conditions encountered during excavation. Of various possible factors, groundwater can cause sudden and high-pressure water inflow during the construction of a large-scale mountain tunnel, resulting...

... and highly weathered welded tuff as designed. In addition, the amount of water inflow was smaller than management standard value. In the non-pre-grouting section, however, the water inflow into the tunnel significantly increased, which required additional grouting from the tunnel face. pre-grouting...

... Characterization structural geology zagro tunnel concentration Corrosion Management repair work water inflow Work Condition Consulting Engineer Upstream Oil & Gas gas concentration Hydrogen Sulfide proceedings gas bearing ground RPM segmental lining H2S management TBM discharge rate...

... by decreasing water pressure and disturbance of water. This study shows that there is a strong relationship between geological and hydrogeological parameters and concentration of gas in the tunnel. These parameters can be considered as indices for identifying potential of gas and water inflow toward the tunnel...