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长期以来针对隧道防水该采用全包防水方案还是半包防水方案,一直是人们争论的焦点。依托厦门翔安海底隧道,对不同防排水方式(即全封堵、堵排结合及排放方式)的隧道衬砌水压力分布规律采用相似模型试验的方法进行研究,模型试验的比例尺为1∶38.88,试验台架可同时施加土压和水压。通过模型试验得出结论:全封堵条件下,防水板全包、半包对衬砌背后的水压力、结构的受力无明显影响;隧道内排水后,半包段衬砌背后水压力明显减小,并随着排水量的增加,水压力基本成直线下降,并且半包段衬砌应变较全包段小,半包情况下衬砌结构受力较为有利。
For a long time for the tunnel waterproofing using all-inclusive waterproofing solution or half-waterproof package, has been the focus of debate. Relying on the Xiamen Xiang’an Subsea Tunnel, a similar model test was conducted on the distribution of water pressure in tunnel linings with different drainage and drainage methods (ie, full blockage, blockage and discharge combination). The scale of the model test was 1:38.88, The test bench can apply earth pressure and water pressure at the same time. Through the model test, it is concluded that under the full sealing condition, the water bag with all-package and half-packs has no obvious influence on the water pressure behind the lining and the structure’s force. After the tunnel drainage, the water pressure behind the half- , And with the increase of drainage, the water pressure basically dropped linearly, and the half-section lining lining strain was smaller than that of the all-inclusive section. Under the condition of half-pack, the stress of the lining structure was more favorable.