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隧道建设（中英文） ›› 2018, Vol. 38 ›› Issue (3): 414-423.DOI: 10.3973/j.issn.2096-4498.2018.03.009
SONG Chaoye*, HE Weiguo
宋超业*， 贺维国
摘要：
A seacrossing tunnel is generally large in scale, having a complex site environment, and lack of engineering experience. The success of the project is directly related to the design plan. At present, no metro seacrossing tunnel havd been built in mainland, and the design standard and technology of the seacrossing tunnel are not studied throughly. The key technology of long and large seacrossing metro tunnel design, including construction method selection, crosssection design, waterproofing and drainage system design, response to complex environment in sea area, durability design, ventilation and evacuation are analyzd with methods of geological analysis, engineering analogy and comprehensive comparison based on the seacrossing tunnel of Xiamen Rail Transit Line 3. A combination of shield and mining methods is proposed for the geological conditions of different sections. The drainage system of the mining section can be maintained by applying advanced grouting to control displacement. The complex geology of the sea area is considered in the targeted design, including a deep weathering trough, a waterrich sand layer, a hard rock and uneven stratum, and the development of solitary rocks. The durability design of the tunnel structure and the limit of the bearing capacity are treated equally to consider safety reserve. The tunnel adopts sectioned longitudinal ventilation and smoke extraction mode, and contains ventilation shafts and civil smoke extraction air shafts on shore to prevent disasters. The conclusions can provide technical support for tunnel scheme decision and reference for similar projects.
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