ABSTRACT
Groundwater inflow during tunneling not only causes construction schedule delay but also long-term groundwater depletion. A highway tunnel excavated through high-permeability formations is illustrated in the paper. During the tunnel construction, a large accumulation inflow of more than 10 T/min was measured. In order to assess the impact of tunnel construction on groundwater resource, various hydrogeological investigations were performed, including tunnel inflow measurement, groundwater level observation and 3D hydrogeological modeling. Even though groundwater level was found showing a temporary drawdown during tunneling, the recovery of groundwater level was observed after the completion of tunnel construction. The assessment results provide a scientific reference for understanding the relationship between tunnel construction and groundwater resource protection.
