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库水位变幅带是库岸边坡稳定的敏感地带,饱水-风干循环作用下岸坡岩体的强度将如何劣化,以及由此引发的地质灾害问题都是十分严峻而又不可回避的。特选取三峡库区典型库岸边坡变幅带区域砂岩为研究对象,进行饱水-风干循环作用试验,试验结果表明,在饱水-风干循环过程中,砂岩试样的抗压强度、凝聚力和内摩擦角均逐渐劣化,变化趋势基本一致,而且,浸泡时水压力变化幅度越大,饱水-风干循环次数越多,损伤效应越明显,说明水压力的升、降和饱水-风干循环作用对岩样的损伤有累积作用。最后,基于砂岩试样的饱水-风干循环作用试验研究,对饱水-风干循环作用的水-岩作用机制进行了详细地探讨。研究成果对于把握库岸边坡变幅带岩体性质劣化规律具有较大的参考价值,为库岸边坡的长期稳定性分析提供了有益的依据。
The fluctuating zone of reservoir water level is a sensitive stable zone of bank slope. How the strength of slope rock mass will deteriorate under the action of water-air-drying cycle and the geological disasters caused by it are very serious and unavoidable. Sandstone in the area of amplitude trending of the typical bank slope in the Three Gorges Reservoir Area is chosen as the research object to conduct the experiment of water-air-drying cycle. The results show that the compressive strength and cohesion of the sandstone sample during the process of water-air- And internal friction angle are gradually deteriorating, the trend of change is basically the same, moreover, the bigger the change range of water pressure is, the more the number of water-air drying cycles is, the more obvious the damage effect is, indicating that the water pressure rises and falls and the saturated water- The cyclic effect has a cumulative effect on the rock samples. Finally, based on the experimental study of saturated water-air-drying cycle of sandstone samples, the water-rock interaction mechanism of saturated water-air-drying cycle was discussed in detail. The research results have great reference value for grasping the law of rock mass degradation in the bank slope of bank slope, which provides a good basis for long-term stability analysis of bank slope.