| 新疆伊犁河谷黄土滑坡冻融失稳机理研究 |
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| 关键词:Yili River valley loess landslide freeze-thaw action DAN-W motion characteristics |
| 基金项目:国家自然科学基金项目(编号: 41472295);中国地质调查局项目(编号: 12120114079101; DD20179609) |
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| Mechanism of Freeze-thaw Loess Landslide in Yili River Valley, Xinjiang |
| The Yili River valley is located in the western section of Tianshan Mountains. It belongs to the typical seasonal permafrost region, and the seasonal freezing-thawing action has a strong influence on the slope stability. Taking the Piliqing River “3.24” landslide as a study case, the authors studied the mechanism of freeze-thaw instability and the motion characteristics of the loess landslide through the field investigation and the dynamic contrast of multistage remote sensing images and the numerical simulation. From the above research the following conclusions could be drawn: (1) The mechanism of the landslide is closely related to water, mainly due to surface water erosion and the freezing and thawing of groundwater. (2) According to deformation characteristics, the landslide instability process is divided into three stages, i.e., the slope toe lateral erosion damage, the frozen perched water and the freeze-thaw cycles. The simulation results show that the slope of the rise of ground water level in the body and the pore water pressure seem to be the major causes of landslide freeze-thaw instability. (3) The Voellmy model and the Frictional model of DAN-W numerical software can better simulate the movement process. The simulation results show that the landslide lasted 12.8 s, the maximum speed was 17.7 m/s, the average accumulation thickness was 4.9 m, and the motion distance was 139 m. This study provides important technical support for early identification and risk assessment of loess freeze-thaw landslide in the Yili River valley. |
| ZHU Sai-nan,YIN Yue-ping,WANG Wen-pei,WEI Yun-jie,SHAO Hai,HUANG Zhe,ZHUANG Mao-guo,SHI Ai-jun.2019.Mechanism of Freeze-thaw Loess Landslide in Yili River Valley, Xinjiang[J].Acta Geoscientica Sinica,40(2):339-349. |
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