Abstract The instability of irrigation reservoir bank slopes in cold regions has seriously affected the benign development of irrigation areas and agricultural production in recent years. To predict and evaluate the slope failure caused by freeze-thaw cycles, a two-dimensional numerical model of thermo-hydro-mechanical multi physical fields of a reservoir soil bank slope is established based on field investigations, laboratory tests and prototype observations. The relationship between the sliding surface temperature and the soil mechanical parameters is proposed by a secondary development program. The generation of the cracks on the bank slope top is explained from the viewpoint of temperature. The hydrothermal changing process of the bank slope under the external temperature is analyzed and compared with the measured data. The long-term degradation process of the soil bank slope under freeze-thaw cycles is studied, and the evolution law of its safety factors with the hydrothermal variation at the sliding surface is quantitatively revealed. The results show that the freeze-thaw cycles have an obvious accelerating effect on the soil bank slope instability, and the safety factor is decreased by 10.43% after 5 freeze-thaw cycles, which directly leads to the bank slope failure

中文翻译：

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寒冷地区冻融循环作用下水库土库边坡的稳定性行为

摘要 近年来，寒冷地区灌区库岸边坡失稳严重影响灌区良性发展和农业生产。为预测和评价冻融循环引起的边坡破坏，基于现场调查、室内试验和原型观测，建立了水库土库边坡热-水-力多物理场二维数值模型。通过二次开发程序提出了滑动面温度与土壤力学参数之间的关系。从温度的角度解释了岸坡顶部裂缝的产生。分析了外界温度作用下岸坡的热液变化过程，并与实测数据进行了比较。研究冻融循环作用下土岸边坡长期退化过程，定量揭示其安全系数随滑面热液变化的演变规律。结果表明，冻融循环对土岸边坡失稳有明显加速作用，5次冻融循环后安全系数下降10.43%，直接导致岸坡失稳