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May occur because of the special nature of the project environment and gushing the seriousness of the disaster , the underwater tunnel has become a kind of high risk underground engineering . Therefore, the disasters that may occur on the study area of the tunnel excavation analysis and forecasting is the key to ensure the safe construction of the tunnel and the normal operation of . At present, the tunnel water inflow forecasting method is to simulate the dynamic groundwater flow field of the field area of the tunnel . And for this purpose the premise is to establish a scientific, rational, accurate hydrogeological conceptual model . In this paper, Shiziyang underwater tunnel , for example , by collecting field area of the tunnel geological, hydrogeological and other information , hydrogeological conditions of generalization and analysis of source and sink terms and penetration of the tunnel the Area boundary conditions , aquifer coefficient. The article has been following conclusions : (1) analysis of the factors affecting the hydrogeological units by screening six lithology, geological structure, topography, permeability , water level , tunnel depth evaluation ; ( 2) the analytic hierarchy - fuzzy comprehensive mathematical methods , the establishment of the tunnel hydrogeological units by discriminant model ; (3 ) research distinguish into DIK33 660 to DIK34 710.DIK34 710 to the DIK38 520 , from DIK38 520 to 950 , DIK38 950 to DIK39 940 , DIK39 940 ~ DIK42 260, DIK42 260 ~ DIK43 000 sixth , which sub- established hydrogeological conceptual model of the tunnel . This article provides a basis for the establishment of accurate and scientific Shiziyang underwater ocean tunnel hydrogeological conceptual model , theoretical reference value and significance of the hydrogeological conceptual model .
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