| 粗粒料接触面模型及其在土石坝工程中的应用 |
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| 引用本文： | 李文轩,卞士海,李国英,吴俊杰.粗粒料接触面模型及其在土石坝工程中的应用[J].岩土力学,2019,40(6):2379-2388. |
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| 作者姓名： | 李文轩 卞士海 李国英 吴俊杰 |
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| 作者单位： | 1. 南京水利科学研究院 岩土工程研究所，江苏 南京 210024；2. 南京水利科学研究院 水利部土石坝破坏机理与防控技术重点实验室，江苏 南京 210024；3. 广西大学 土木建筑工程学院，广西 南宁 530004；4. 新疆水利水电勘测设计院，新疆 乌鲁木齐 830000 |
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| 基金项目： | 国家自然科学基金青年科学基金（No.51509163）；水利部公益性行业科研专项经费项目（No.201501035） |
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| 摘 要： | 在土石坝工程中越来越重视岸坡与坝料之间的接触特性，将土体本构模型中使用较多的双曲线型硬化规律运用至接触面模型，提出了一个简洁的接触面本构模型，推导了接触面模型刚度矩阵表达式。通过对4组试验的预测结果与试验结果的对比，表明该模型可以较好地预测粗粒料的界面剪切试验。将提出的接触面模型嵌入有限元程序，应用于如美心墙坝河谷与坝料的接触分析。三维有限元计算结果表明：坝体两侧岸坡的剪切位移变化规律都是中间部分剪切滑移量较大，岸坡边缘部分相对较小，陡坡一侧最大滑移量大于较缓一侧。这些均符合粗粒料滑移的基本规律，可为岸坡?坝料接触特性研究以及土石坝工程计算提供参考。
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| 关 键 词： | 双曲线型硬化规律 接触面模型 直剪试验 模型验证 剪切滑移特性 |
| 收稿时间： | 2018-06-29 |
Interface model of coarse-grained soils and its application in earth rock dam |
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| LI Wen-Xuan,BIAN Shi-hai,LI Guo-ying,WU Jun-jie.Interface model of coarse-grained soils and its application in earth rock dam[J].Rock and Soil Mechanics,2019,40(6):2379-2388. |
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| Authors: | LI Wen-Xuan BIAN Shi-hai LI Guo-ying WU Jun-jie |
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| Abstract: | More and more attention was paid to the behavior of bedrock-dam materials interface in earth rockfill dams. The hyperbolic hardening rule for constitutive model of coarse grained soil is introduced into the model for soil-structure interface and thus a simple elasto-plastic interface model is suggested. The expression of stiffness matrix of interface model is derived. The performance of proposed model is demonstrated by comparing its predictions with direct shear test results for different types of granular soils, including sand and rockfill materials, during shearing. Within the framework of thin layer element finite element scheme, the interface model is applied in numerical finite element program. Combining Rumei high core-wall dam example, shear sliding property of shear band between dam materials and valley is analyzed. Simulation results show that tangential displacements of middle zone of slope is relatively large while the edge zone is relatively small. These are in accordance with the sliding law of coarse-grained soils, which provide a favorable reference to research on shear sliding property of bedrock-dam materials interface and deformations calculation of earth-rock dam. |
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| Keywords: | hyperbolic hardening rule interface model direct shear test model validation shear sliding property |
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