| 边坡渐进破坏的动态强度折减法研究 |
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| 引用本文： | 陈国庆,黄润秋,周辉,许强,李天斌.边坡渐进破坏的动态强度折减法研究[J].岩土力学,2013,34(4):1140-1146. |
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| 作者姓名： | 陈国庆 黄润秋 周辉 许强 李天斌 |
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| 作者单位： | 1.成都理工大学 地质灾害防治与地质环境保护国家重点实验室，成都 610059； 2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
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| 基金项目： | 国家自然科学基金资助（No. 41130745，No. 41272330）；中国博士后科学基金资助（No. 201104639，No. 20100481374） |
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| 摘 要： | 边破的变形破坏是量变积累到质变的渐进发生过程，由坡体内部潜在滑动面的逐渐破损并扩展至整体滑面。基于强度折减法思想，提出模拟边坡渐进破坏的动态强度折减法。该方法利用屈服接近度指标YAI确定边坡的破损区域，将YAI<0.2的区域定为破损区，通过不断动态折减局部破损坡体的强度参数，使边坡潜在滑动面渐进演化至贯通，边坡达到极限平衡状态。算例计算表明，该方法可有效解决强度折减法中折减范围的问题，克服整体强度折减法破损区过大的缺陷，获得的位移变化趋势与破损区演化过程也具有良好的一致性。动态强度折减法真实再现了边坡渐进失稳过程，为强度折减法更有效地应用于边坡稳定性定量评价提供有效途径。
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| 关 键 词： | 边坡工程 渐进破坏 动态强度折减 失稳判据 稳定性评价 |
| 收稿时间： | 2012-08-14 |
Research on progressive failure for slope using dynamic strength reduction method |
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| CHEN Guo-qing,HUANG Run-qiu,ZHOU Hui,XU Qiang,LI Tian-bin.Research on progressive failure for slope using dynamic strength reduction method[J].Rock and Soil Mechanics,2013,34(4):1140-1146. |
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| Authors: | CHEN Guo-qing HUANG Run-qiu ZHOU Hui XU Qiang LI Tian-bin |
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| Institution: | 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The failure of slope is a progressive process which from quantitative changes to qualitative changes. The whole sliding surface will be taken place by gradual damage of the potential sliding surface in the slope body gradually. Based on the strength reduction method, dynamic strength reduction method that can simulate the progressive failure of slope was proposed. At first, yielding approach index(YAI) is used to appraise the damaged region of slope in the numerical simulation, the region that YAI is less than 0.2 is recognized as the damaged region. Then through the continuous local damage reduction of the strength parameters of the local slope body, the potential sliding surface is damaged gradually and evolved to breakthrough finally. The practical results show that the proposed method can settle the reduction region in the strength reduction method effectively; and overcome the defect of large plastic damage area by the whole strength reduction method. The trend of displacement and damage area change also has better consistency in the reduction process. Dynamic strength reduction method can simulate the progressive failure of the slope truly; and it provides quantitative basis of slope stability appraising for strength reduction method. |
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| Keywords: | slope engineering progressive failure dynamic strength reduction instability criterion stability evaluation |
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