4.7 Article

Stability behavior of a reservoir soil bank slope under freeze-thaw cycles in cold regions

期刊

COLD REGIONS SCIENCE AND TECHNOLOGY
卷 181, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.coldregions.2020.103181

关键词

Safety factor; Moisture migration; Thermal convection coupling; Freeze-thaw cycle; Soil bank slope; Cold region

资金

  1. National Key Research and Development Program of China [2018YFC0809605, 2018YFC0809600]
  2. Key Research Program of Frontier Sciences of Chinese Academy of Sciences [QYZDYSSW-DQC015]
  3. National Natural Science Foundation of China [41230630]
  4. Program of the State Key Laboratory of Frozen Soil Engineering [SKLFSE-ZT-23]
  5. Key Research Program of the Chinese Academy of Sciences [ZDRW-ZS2020-1]

向作者/读者索取更多资源

By studying the instability of irrigation reservoir bank slopes in cold regions caused by freeze-thaw cycles, a numerical model was established to predict the slope failure based on temperature, cracks generation, and safety factors with hydrothermal variation. The results show a 10.43% decrease in safety factor after 5 freeze-thaw cycles, indicating an accelerated slope instability.
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

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