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厦门第二西通道工程跨海域段为采用钻爆法施工的水下隧道,该隧道在海域最低点的废水泵房有效容积要求达6519m3,采用常规的利用联络通道或主洞下部扩挖的泵房方案均不能满足蓄水需求。在对影响泵房方案因素分析的基础上,提出了纵向式、横向式、纵横混合式和下沉式四种大容积泵房布置方案。通过对四种泵房方案的定性分析,得出了纵向式与下沉式泵房方案在施工出渣便捷性、运营经济性、养护便利性等方面较其他两种方案有较好的优势。通过对纵向式与下沉式泵房方案进行有限元数值模拟得出,下沉式泵房缩短了纵向长度,降低了围岩受风化槽侵蚀影响的不确定性,简化了洞室结构,安全性优于纵向式泵房,综合优势明显。研究可为大容积水下隧道泵房形式设计提供借鉴。
The cross-sea section of the Second West Passage of Xiamen is an underwater tunnel constructed by the drilling and blasting method. The effective volume of waste water pumping station at the lowest point in the sea reaches 6519m 3. Conventional use of communication channels or pumps Housing programs can not meet the needs of water storage. Based on the analysis of the factors that affect the pumping station scheme, the layout schemes of four kinds of large-capacity pumping stations, which are vertical type, horizontal type, vertical and horizontal hybrid type and sunken type, are proposed. Through the qualitative analysis of four kinds of pumping station schemes, it is concluded that the vertical and submerged pump schemes have better advantages than the other two schemes in terms of convenient construction, operation economy and maintenance convenience. Through the finite element numerical simulation of the vertical and submerged pump house schemes, it is concluded that the submerged pump house shortens the longitudinal length and reduces the uncertainty of the surrounding rock affected by the erosion of the weathered groove, simplifying the structure of the cavern and the safety Sexuality is better than the vertical pump room, the obvious advantages of comprehensive. The research can provide reference for the design of large volume underwater tunnel pumping station.