基于层次-熵值组合法的越江地铁隧道防水可靠性评价

Waterproofing Reliability Evaluation of Crossing-river Metro Tunnel Based on Hierarchical Entropy Method

隧道透水是越江地铁工程建设与运营中面临的主要安全隐患,探明越江地铁防水可靠性对保障地铁隧道运营安全至关重要。采用层次-熵值组合法与模糊综合评价法,对地铁隧道透水灾害风险因子进行汇总分析,得出越江地铁隧道运营期防水可靠性评价模型;并以武汉地铁2号线为例,对该隧道工程运营期防水可靠性进行风险评价,得出隧道运营安全等级,并提出相应控制措施。结论认为,层次-熵值组合法综合考虑主观性与客观性,所得指标权重更加科学,构建的越江地铁隧道运营期防水可靠性风险评价模型适用性好;其中,管片拼接质量、地基承载力和结构抗渗等级为系统安全关键节点。研究成果为越江地铁隧道防水可靠性评价提供理论支持。

Tunnel permeable is the main hidden danger in the construction and operation of the crossing-river metro and it is very important to prove the waterproofing reliability to ensure the safe operation of the crossing-river tunnel. In this paper, the hierarchical entropy method and fuzzy comprehensive evaluation method are used to summarize and analyze risk factors of permeable disaster in metro tunnels, and the waterproof reliability evaluation model in the operation period of the crossing-river metro tunnel is obtained. With reference to Metro Line 2 in Wuhan, the risk assessment of waterproof reliability during the operation period of this tunnel project is carried out, the safety level of tunnel operation is obtained, and corresponding control measures are put forward. It is concluded that the hierarchical entropy method holds subjectivity and objectivity, and the index weight obtained is more scientific. The risk evaluation model for waterproofing reliability of the crossing-river metro tunnel in operation period has good applicability. Segment splicing quality, foundation bearing capacity and structural impermeability are the key nodes of system safety. The research results provide theoretical support for the evaluation of waterproofing reliability of the crossing-river metro tunnel.