前缘反倾式锁固型滑坡变形破坏模式及失稳机理
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P642

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on Deformation Failure Mode and Instability Mechanism of Front Anti-tilt Locked Landslide
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    了解滑坡的失稳机理和破坏模式是对其进行预防预报的前提。采用物理模型试验方法,以降雨为触发条件,进行多次模型试验,记录前缘反倾式锁固型边坡在不同坡面形态时的变形破坏现象,研究该类边坡的失稳机理及破坏模式。研究结果表明:前缘反倾式锁固型边坡为后缘推移式滑动破坏,该类边坡失稳始于边坡后缘,其破坏模式为:开始降雨—雨水从坡面入渗,边坡土体强度降低—后缘土体发生沉降—前缘土体发生垮塌—坡体后缘持续下沉,推动边坡底部土体向前滑动—坡体前缘出现推挤隆升现象—边坡整体失稳破坏;前缘反倾式锁固型边坡发生整体失稳的根本原因是边坡前缘土体强度降低及垮塌,致其无法提供足够的抗滑力,边坡发生整体失稳。研究成果对此类滑坡的预防预报具有一定的指导意义。

    Abstract:

    Understanding the instability mechanism and failure mode of landslide is the precondition for its prevention and prediction. Using physical model test method and rainfall as trigger condition, many model tests were carried out. The deformation and failure phenomena of frontal anti-dip locked slopes under different slope morphologies were recorded, and the failure mechanism and failure mode of such slopes were studied. The results show that: The leading edge anti-trending locking slope is the trailing edge sliding landslide. The instability of this kind of slope begins at the trailing edge of the slope, and its failure mode is as follows: Start raining— Rainwater infiltration from the slope reduces the strength of the slope soil—Settlement of back edge soil—Front soil collapse—Continuous subsidence of the back edge of the slope promotes the forward sliding of the soil at the bottom of the slope—Pushing and uplifting at the front of slope—Integral instability failure of slope; The basic reason for the overall instability of the front anti-dip locked slope is the decrease of the strength of the soil in the front of the slope and the collapse, which makes it unable to provide enough anti-sliding force and the overall instability of the slope. The research results have certain guiding significance for the prevention and prediction of such landslides.

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耿正,刘汉东,王四巍,等. 前缘反倾式锁固型滑坡变形破坏模式及失稳机理[J]. 科学技术与工程, 2020, 20(9): 3501-3508.
Geng Zheng, Liu Handong, Wang Siwei, et al. Study on Deformation Failure Mode and Instability Mechanism of Front Anti-tilt Locked Landslide[J]. Science Technology and Engineering,2020,20(9):3501-3508.

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历史
  • 收稿日期:2019-07-03
  • 最后修改日期:2020-01-07
  • 录用日期:2019-10-07
  • 在线发布日期: 2020-05-14
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