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水库正常运营过程中,将周期性的进行蓄水、排水,库岸边坡部分岩体处于“饱水-风干”的循环状态,将造成岩体性质劣化。据此,在以往研究的基础上,对循环加卸载砂岩损伤试样进行了“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,砂岩损伤试样的纵波波速、回弹值和单轴抗压强度均逐渐劣化,而且规律明显。水压力的升、降和“饱水-风干”循环作用对岩体的损伤有累积放大作用,而且,浸泡时水压力变化越大,“饱水-风干”循环次数越多,岩体的损伤越严重。与“完整”砂岩试样的“饱水-风干”循环作用试验结果相比,损伤砂岩试样各项力学指标衰减的更快,说明损伤岩体对水-岩作用更加敏感,这也能较好的解释一些震后边坡在浸泡或者降雨时出现失稳的原因。研究成果对库岸边坡岩体在“饱水-风干”循环过程中的岩体性质劣化规律研究具有较大的参考价值。
During the normal operation of the reservoir, the reservoirs and drainage will be periodically carried out. Part of the rock mass on the bankslope of the reservoir will be in the state of “full water-air-dry” and the rock mass will be deteriorated in nature. Therefore, based on the previous studies, the “saturated water-air-drying” cycle test was carried out on the cyclic loading and unloading sandstone samples. The results show that in the “full water-air drying” The longitudinal wave velocity, the rebound value and the uniaxial compressive strength of the damaged specimens are gradually deteriorated, and the law is obvious. Water pressure rise and fall and “full water - air dry ” cycle effect on the rock mass cumulative amplification, and, the greater the change in water pressure when immersed, “full water - drying ” the more the number of cycles, The damage of rock mass is more serious. Compared with the results of “saturated water-air-dried” cyclic test of the “complete” sandstone sample, the mechanical indexes of the damaged sandstone sample decay more rapidly, indicating that the damaged rock mass is more sensitive to water-rock interaction, This can also explain some of the reasons for the instability of slope after immersion or rainfall after the earthquake. The research results have a great reference value for the research on the law of rock mass degradation in the “full water-air-dry” cycle of the bank slope rock mass.