Wetting-drying alternation caused by seasonal rainfall and water fluctuation has a negative effect on the rock mass. Model experiments were conducted in this paper to investigate the role of wetting-drying alternation on the seepage and failure features of a tunnel. Water-bearing structure was located in the lateral position of tunnel. The stratum thickness between the tunnel and water-bearing structure was ranged from 20 to 100 mm. The results showed that, with an increase in the wetting-drying alternation number, the pore water pressure increases gradually. The critical water pressure also increases gradually with the increasing thickness of water-resisting stratum. With the increase of the stratum thickness, the permeable area is gradually widened and the water storage capacity becomes stronger. The failure mode of water-resisting stratum under geostress and water pressure can be summarized as two types: fracture failure (thickness of 20 mm) and slippage failure (thickness between 40 and 100 mm), respectively.

中文翻译：

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干湿交替下隧道渗流破坏特征模型试验研究

季节性降雨和水位波动引起的干湿交替对岩体有不利影响。本文通过模型试验研究干湿交替对隧道渗流破坏特征的影响。含水结构位于隧道横向位置。隧道与含水结构之间的地层厚度为20～100 mm。结果表明，随着干湿交替数的增加，孔隙水压力逐渐增加。临界水压也随着阻水地层厚度的增加而逐渐增加。随着地层厚度的增加，渗透面积逐渐扩大，蓄水能力增强。