| 黄土填方边坡界面渗流破坏机制模型试验研究 |
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| 引用本文： | 余岱金,黄强兵,康孝森,陈星,刘悦.黄土填方边坡界面渗流破坏机制模型试验研究[J].水文地质工程地质,2022,49(5):119-128. |
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| 作者姓名： | 余岱金 黄强兵 康孝森 陈星 刘悦 |
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| 作者单位： | 1.长安大学地质工程系， 陕西 西安 710054 |
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| 基金项目： | 国家自然科学基金项目（41790443；42041006）；国家重点研发计划课题（2017YFD0800501） |
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| 摘 要： | 为了扩大可用耕地面积，延安地区开展了一系列的治沟造地工程，在填方坡体与原始坡体之间形成了接触界面，这类界面潜在影响着填方坡体的渗流变形破坏。针对延安地区治沟造地工程黄土填方边坡已有的和潜在的变形破坏问题，通过室内黄土边坡降雨模型试验，研究了界面对黄土填方坡体渗流特性与变形破坏的影响规律，揭示了界面渗流影响下填方边坡的破...
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| 关 键 词： | 治沟造地工程 黄土 边坡 模型试验 界面渗流 破坏机制 |
| 收稿时间： | 2022-02-14 |
A model test study of the interface seepage and failure mechanism of loess-filled slope |
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| Institution: | 1.Department of Geological Engineering, Chang’an University, Xi’an, Shaanxi 710054, China2.Anhui Transport Consulting & Design Institute Co. Ltd., Hefei, Anhui 230088, China3.School of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, China |
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| Abstract: | A series of Gully Reclamation Projects were carried out in Yan’an City to expand the area of available arable land. In these projects, contact interfaces formed between filled slope and original slope potentially influenced the seepage deformation and failure of the loess-filled slope. This paper aims to solve the deformation and failure of loess-filled slope in Yan’an City using the indoor rainfall model test. The influence of interface on seepage characteristics and deformation failure of loess-filled slope is analyzed, and the failure mechanism of loess-filled slope affected by the interface is revealed. The results show that: (1) the interface is a dominant seepage channel for rainwater infiltration in the loess-filled slope; along the seepage channel, rainwater infiltrates into the middle and bottom of the filling body and gathers in the middle of the filling body with the infiltration rainwater from slope surface; the process accelerates the saturation process of the filled slope, changes its seepage field and effective stress field, causes tensile stress at its top and shoulder, and induces the initiation and expansion of multiple tension cracks. (2) In the process, a small range of erosion occurs in the middle of the slope toe, and a large range of erosion damages in the middle of filled-slope surface; the erosion damage triggers a large-scale shallow sliding in the middle and bottom of the filled slope, and further intensifies the initiation and expansion of cracks at the top and shoulder of the filling body; finally, multiple dominant seepage channels and complex topographic feature are formed, and the local stability of loess-filled slope is gradually reduced. The research results are important for the stability evaluation of loess-filled slope and the service life of the Gully Reclamation Projects. |
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