According to the water-containing m

According to the water-containing medium and hydrodynamic conditions, the type of groundwater in the proposed tunnel site can be divided into quaternary loose layer pore water and bedrock fissure water. Quaternary loose layer pore water: It is stored in the Quaternary loose accumulation layer on the hillside, mainly recharged by atmospheric precipitation, most of it is discharged by evaporation, and a small part penetrates into the ground into bedrock fissures and is converted into bedrock fissures water. According to 1: 2000 engineering geological mapping, the amount of groundwater in this kind of tunnel area is small and is greatly affected by atmospheric precipitation. Bedrock fissure water: unevenly distributed in the weathering fissures of the mudstone in the tunnel site area, mainly receiving the recharge of atmospheric precipitation, followed by the infiltration replenishment of the pore water of the Quaternary loose layer. Weathered fissures are the main place of occurrence and movement channels of this type of groundwater. Its flow direction, velocity, and flow rate are controlled by the connectivity, development direction, degree of development, and rock level of the fissure. This type of groundwater has a small amount of water and is significantly affected by atmospheric precipitation. When the tunnel passes through the rock formation, if it encounters a water-flooded weathering fissure layer, it may produce dripping.