Corrosion investigation of groundwater for underground tunnel

Underground tunnel becomes the common engineering for human activities in recent years. The groundwater corrosion cause significant casualties and economic loss for the tunnel. Hydrology investigation, chemical analysis, and water resistance analysis were carried out to study the corrosion effect of an hydropower tunnel in West China in this paper. First, the groundwater in the study area mainly consists of the bedrock fissure water, fault fissure water and the pore water. Then ten group representative samples of spring point were took to make chemical analysis separately. The SO4 of two points near the big fault are more than 250 mg/l. Results show that it have weak corrosive action to the ordinary cement, the proposal measures should be considered for the tunnel design. The corrosion effect of the groundwater is clarified clearly by the tests. At last, some controlling measures and suggestions for tunnel design were present.