The cyclic wetting-drying (W-D) phenomenon, which is a part of weathering processes, plays a vitally important role in affecting rock materials’ properties. In this paper, the gypsum breccia, an environmentally sensitive rock, was taken as the research object, which has the characteristics of high solubility. The deterioration behavior of gypsum breccia under W-D cycles with different flow rates was investigated. A one-dimensional water saturation test was conducted to study the coupling mechanism of water saturation-dissolution of gypsum breccia. A series of W-D cycle tests with different flow rates (0, 10, and 20 l/h) for gypsum breccia were conducted to reveal its deterioration behavior. Furthermore, the influence of these effects on the stability of the tunnel was discussed. The results show that gypsum breccia has a coupling behavior of water saturation and dissolution in the water environment. The effect of W-D cycles is the primary reason for the formation of visible cracks in gypsum breccia, while the flowing water will wash away the loose particles caused by the action of W-D cycles and accelerate the development of visible cracks and dissolution in gypsum breccia. The combination of these two actions gradually deteriorates the self-stability of the surrounding rock, which eventually leads to lining damage due to overload. The study can provide references for the engineering design of tunnels in gypsum breccia.

循环湿润干燥（WD）现象是风化过程的一部分，在影响岩石材料的特性方面起着至关重要的作用。本文以对环境敏感的石膏角砾岩为研究对象，具有高溶解度的特征。研究了不同流速的WD循环下石膏角砾岩的劣化行为。进行了一维水饱和度试验，研究石膏角砾岩水饱和度-溶解度的耦合机理。对石膏角砾岩进行了一系列不同流速（0、10和20 l / h）的WD循环试验，以揭示其劣化行为。此外，讨论了这些影响对隧道稳定性的影响。结果表明，石膏角砾岩在水环境中具有水饱和度和溶解度的耦合行为。WD循环的影响是在石膏角砾岩中形成可见裂纹的主要原因，而流动的水将冲走由WD周期的作用引起的疏松颗粒，并加速可见裂纹的发展和石膏角砾岩的溶解。这两种作用的结合逐渐降低了围岩的自稳性，最终由于过载而导致衬砌损坏。该研究可为角砾岩隧道的工程设计提供参考。而流动的水将冲走WD循环的作用所导致的疏松颗粒，并加速可见裂纹的产生和石膏角砾岩的溶解。这两种作用的结合逐渐降低了围岩的自稳性，最终由于过载而导致衬砌损坏。该研究可为角砾岩隧道的工程设计提供参考。而流动的水将冲走WD循环的作用所导致的疏松颗粒，并加速可见裂纹的产生和石膏角砾岩的溶解。这两种作用的结合逐渐降低了围岩的自稳性，最终由于过载而导致衬砌损坏。该研究可为角砾岩隧道的工程设计提供参考。