| Xia'men east passage subsea tunnel under-construction, is the first subsea tunnel in mainland of China, compared to general highway tunnels, its maintenance and rehabilitation management is more important during operation. The subsea tunnel's maintenance is a complex work and a lot of data need to be processed. So, it is necessary to carry out the research based on the database management system of the undersea tunnel's maintenance. As the influence of geological conditions, terrain conditions, climatic conditions the investigation, designing, construction and running, etc. So that different extent diseases, such as lining split, leakage water, cavity behind lining, lining corrosion will appeared in subsea tunnel in service, and these diseases and endanger may have tremendous influence to the safety of tunnel structure in service. So, the research on the safety assessment of subsea tunnel in all kinds of complex circumstances and conditions is another important subject. The major work of this research is summarized as follows:1. Database Management of subsea tunnel's maintenance: The maintenance of the subsea tunnel refers to much information, including designing data, construction data, disease detection data, etc. So, it is very necessary to establish database management for the subsea tunnel, and it is the base of the system.2. Structural Safety Assessment System to the subsea tunnel: This part describes the principle of fuzzy comprehensive evaluation, the selection of evaluation indexes, the determination of indexes weight and other problems. At last, it initially establishes the model of fuzzy comprehensive evaluation for the subsea tunnel's structural safety assessment.3. Computer Software System: This part describes the development thought and framework of the computer system and it introduces the function of system modules and work flow of the system.
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