Comprehensive Ahead Prospecting of Tunnels in Severely Weathered Rock Mass Environments with High Water Inrush Risk: A Case Study in Shaanxi Province

Figure 9

Comprehensive interpretations and excavation photos for each section. (a) Comprehensive map of rock masses within 100 m of the front of the tunnel. (b) Excavation photo of the first section. (c) Excavation photo of the second section, with considerable water pouring. (d) Excavation photo of the third section, where water flow still occurred.