| 坡面降雨和坡脚浸泡对土坡影响的模型试验研究 |
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| 引用本文： | 王一冰,朱宝强,周成,谭昌明,韩利彪.坡面降雨和坡脚浸泡对土坡影响的模型试验研究[J].水利与建筑工程学报,2020(2):21-26,32. |
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| 作者姓名： | 王一冰 朱宝强 周成 谭昌明 韩利彪 |
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| 作者单位： | 四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;四川省公路规划勘察设计研究院有限公司 |
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| 基金项目： | 国家自然科学基金项目(51579167);四川省重点研发项目(20ZDYF2914)。 |
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| 摘 要： | 降雨是诱发边坡失稳破坏的重要因素,为研究降雨条件下土质边坡的滑动破坏规律,为了便于制模和坡土位移的PIV观测,开展了无黏性土降雨滑坡的模型试验,利用体积含水率传感器测试了降雨条件下坡土不同位置处含水率的变化特征,利用PIV技术研究了边坡渐进变形破坏的发展过程,分析了变形场特征,并进一步研究了长时间降雨坡脚浸泡导致的破坏规律。结果表明:持续降雨入渗条件下坡土体积含水率依次可分为初始平稳期、上升期和最终稳定期三个阶段,坡脚土体的积水会导致边坡进一步滑移破坏。边坡破坏模式为渐进式滑移变形破坏;根据边坡速度场和位移场随厚度分布特征,可将坡土从下往上分为稳定层、剪切层和随动层。
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| 关 键 词： | 土质边坡 坡面降雨 坡脚浸泡 变形破坏 |
Model Test on the Effects of Rainfall on the Surface and Inundation at Slope Toe on Landslides |
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| WANG Yibing,ZHU Baoqiang,ZHOU Cheng,TAN Changming,HAN Libiao.Model Test on the Effects of Rainfall on the Surface and Inundation at Slope Toe on Landslides[J].Journal of Water Resources Architectural Engineering,2020(2):21-26,32. |
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| Authors: | WANG Yibing ZHU Baoqiang ZHOU Cheng TAN Changming HAN Libiao |
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| Affiliation: | (State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu,Sichuan 610065,China;Sichuan Provincial Highway Planning,Survey Design and Research Institute Co.,Ltd.,Chengdu,Sichuan 610041,China) |
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| Abstract: | Rainfall is an important factor in inducing instability of slopes. In order to analyze the sliding failure mechanism of soil slope under rainfall conditions, model test on cohesionless soil slope under rainfall was conducted, the variation of moisture content at different depth and position of the slope was measured by means of the volumetric moisture content sensor. Progressive failure of the slope and the deformation characteristics was analyzed by the PIV technology. The failure mechanism of the slope by long-term immersion at the slope toe under rainfall was studied as well. The test results show that the volume moisture content of the slope under continuous rainfall infiltration condition can be divided into three stages: initial stable stage, rising stage and final stable stage, and inundation of water at slope toe will further pull sliding of slope. The slope exhibits a model of progressive deformation to failure, and according to the distribution characteristics of velocity or displacement within the thickness of slope soil, the slope soil can be divided into the no-flow zone, the shear zone and the rigid zone from the slip surface to the slope surface. |
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| Keywords: | soil slope rainfall on the slope surface immersion at the slope toe deformation and failure |
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