The subsea tunnel engineering that lies at Jiaozhou Bay in Qingdao is introduced, as well as the research status of little distance parallel tunnels in China.
介绍青岛胶州湾湾口海底隧道的工程概况和国内小间距隧道的研究现状。
The approaching construction for two neighboring parallel tunnels in the numerous underground projects is the most normal and basic type in the development of underground space in city.
在众多地下工程的近接施工中，相邻两孔平行隧道的近接施工是城市地下空间开发中最常见和最基本的近接类型。
The parallel dual-subway tunnels are often constructed in the same buried depth of most metro running tunneling.
且大多数地铁区间隧道中，通常在同一埋深地层平行修筑两条隧道。
In recent years, the parallel dual-subway tunnels have increased rapidly because of the need of planning and plane design, the restriction of terrain, geology and surface construction.
近年来为满足规划、平面线型要求，受地形、地质、地面构筑物的影响，双线地铁隧道呈迅猛增加的趋势。
In recent years, the parallel dual-subway tunnels have increased rapidly because of the need of planning and plane design, the restriction of terrain, geology and surface construction.
近年来为满足规划、平面线型要求，受地形、地质、地面构筑物的影响，双线地铁隧道呈迅猛增加的趋势。
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