| 新疆伊犁河谷黄土滑坡冻融失稳机理研究 |
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| 引用本文：朱赛楠,殷跃平,王文沛,魏云杰,邵海,黄喆,庄茂国,石爱军.2019.新疆伊犁河谷黄土滑坡冻融失稳机理研究[J].地球学报,40(2):339-349. |
| DOI：10.3975/cagsb.2018.061904 |
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| 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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| 中文摘要:伊犁河谷地处中国天山山脉西段, 属于典型的季节性冻土区, 季节性冻融作用对斜坡稳定性影响强烈。本文以皮里青河“3.24”滑坡为例, 通过现场详细调查、多期遥感影像动态比对、数值模拟等方法, 研究了黄土滑坡冻融失稳机理与滑坡运动特征, 得到以下几点认识: (1)滑坡失稳与水密切相关, 一方面是地表水侵蚀作用, 另一方面是地下水的冻融作用; (2)根据变形特征, 将滑坡失稳过程分为坡脚侵蚀、冻结滞水和冻融循环破坏三个阶段, 模拟结果表明, 地下水水位上升导致孔隙水压力增大是滑坡冻融失稳的主要原因; (3)DAN-W数值模拟软件的Voellmy模型和Frictional模型可较好地模拟滑坡的运动堆积过程, 模拟结果显示, 滑坡历时12.8 s, 最大运动速度17.7 m/s, 平均堆积厚度4.9 m, 运动距离139 m。本研究为伊犁河谷地区黄土冻融滑坡的早期识别与风险评估提供了重要的技术支撑。 |
| 中文关键词:伊犁河谷 黄土滑坡 冻融作用 DAN-W 运动特征 |
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| Mechanism of Freeze-thaw Loess Landslide in Yili River Valley, Xinjiang |
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| Abstract: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. |
| keywords:Yili River valley loess landslide freeze-thaw action DAN-W motion characteristics |
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