Study On Geological Hazards And Its Risk Management In The Construction Of Karst Water-rich Highway Tunnel

The construction safety of karst water-enriched highway tunnel is an important project that the study of tunnel construction focuses on.The complexity of tunnel construction geology makes tunnel accidents happen from time to time.It is very important and urgent to ensure the safety of life and property of tunnel construction workers.Based on the construction practice of the Baitao tunnel group project,this article focuses on the two aspects of geological disasters in the construction of the karst-rich water highway tunnel and the risk management and control of the geological disasters.The main contents are as follows:(1)Describe in detail the definition of the risk management and control of the karst water tunnel and the basic content of the whole process flow;(2)According to the existing risk classification criteria for highway tunnels,the risk assessment level of karst tunnels is divided into four levels: low risk,medium risk,high risk,and extremely high risk;(3)Systematically summarizes the geological risk assessment methods for the construction of karst water-enriched tunnels,and focuses on the ideas and solving process of the fuzzy-level comprehensive analysis method;(4)Based on the engineering Bailing tunnel group project in Liling,the risk assessment system for the Baitao tunnel group was established based on the meteorological,hydrological,topographical,stratigraphic,and special adverse geological conditions,combined with the actual construction of the Baitao tunnel project.(5)A comprehensive analysis of risk of construction geological hazards in the relevant sections of Hetao Tunnel,Huilongwan Tunnel,and Baitao Tunnel in the Baitao Tunnel Group was conducted using the fuzzy-level comprehensive analysis method,and the overall construction geological hazard risk assessment rating for each tender was obtained.The simulation method is used to more precisely classify the geological disaster risk levels in the tunnel cavern section to complete the assessment of the overall project-to-local specific risks.(6)Combining infrared water detection method,ground penetrating radar method and TGP advanced geological prediction to make predictions of construction geologicalrisks for water inrush,clay cave,cavern,hidden river and landslide risks in karst water-rich tunnels,and provide corresponding construction risks.Control measures.The main ideas of this paper are:(1)Relying on the case project of Bailing tunnel group in Fuling,a risk assessment index system has been established;(2)The overall risk assessment of the tunnel has been carried out by using the fuzzy-level comprehensive analysis method,and combined with the numerical simulation analysis method,the tunnel The karst section carried out a comprehensive evaluation of the relevant construction geological risks.