Characteristics of water environment along Baojiashan super long tunnel

Abstract

Abstract Based on the synchronous monitoring data of surface runoff, groundwater level and water inflow of Baojiashan super long tunnel, the characteristics of water environment along the tunnel are studied. The results show that: (1) Both surface runoff and groundwater level are significantly affected by rainfall, and the lag is not obvious. (2) The tunnel water inflow is significantly affected by rainfall, and the water is mainly discharged from the North portal. (3) Through the monitoring of the water pressure after the tunnel lining, it shows that the sand settling basin in the later stage of tunnel supplementary construction has played a great role in drainage and decompression, and has played a powerful role in ensuring the safe operation of the tunnel. (4) The change of tunnel drainage flow is closely related to precipitation, and tunnel drainage will not have a great impact on the surrounding environment.