Abstract
Water and mud inrush is one of the typical geological hazards during tunnel construction in karst area. In weight of water or mud inrush risks of karst tunnels are studied and the index system for water and mud inrush risk evaluation is established based on analytic hierarchy process. The analysis shows that geological structure, formation lithology and groundwater level are the main control ingredients of water or mud inrush risk；geographic and geomorphic conditions, attitude of rock formation are the minor significant factors；surrounding rock mass classification , rainfall are the least important elements. Aiming at a tunnel in Chongqing, combining with the actual geological situation of the tunnel site, the evaluation model is used to evaluate the risk of water and mud inrush in each section, which provides a certain theoretical basis for the prevention and control of water and mud inrush disaster during the tunnel construction.
Highlights
With the promotion of the strategy of "Western Development" and the construction of the Belt and Road Initiative, the Tunnel construction in China is gradually transferring to the western mountainous and karst areas with extremely complex terrain and geological conditions
Mao Bangyan[7] and others put forward the risk staging system of water and mud inrush in tunnels; Han Xingrui[8,9] puts forward an expert evaluation system for karst water gushing in tunnels; Li Shucai[2,3,4,5,6] and others have continuously improved the analytic hierarchy process (AHP) and applied it to the risk assessment of water inrush in different projects, and achieved good results
Zhang Qingsong[10] and others have carried out the research on the theory and method of water inrush risk assessment of high-risk karst tunnels, and established the quantitative assessment method of water inrush risk and the four-color disaster warning mechanism; Kuang Xing[11] and others established a geological disaster system for karst water inrush during tunnel construction in karst areas, and used a fuzzy comprehensive evaluation model to evaluate the risk of water inrush and mud inrush disasters in karst tunnels
Summary
With the promotion of the strategy of "Western Development" and the construction of the Belt and Road Initiative, the Tunnel construction in China is gradually transferring to the western mountainous and karst areas with extremely complex terrain and geological conditions. 2.1 Selection of risk influencing factors According to the basic geological characteristics of the tunnel site and the existing disaster-causing factors, combined with the research results of experts and scholars, we selected the formation lithology, geological structure, geographic and geomorphic conditions, groundwater level, attitude of rock formation, the level of surrounding rock, rainfall for seven evaluation factors, and divided the risk levels (levels are divided into I - IV, including I for the minimum risk, IV for the highest risk), and established an index system for risk evaluation of water and mud inrush of the tunnel in karst area. Weak disaster causing near the tunnel, or some l large pressurized water-conducting
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