| 堆石非线性强度特性对高土石坝稳定性的影响 |
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| 引用本文： | 陈立宏,陈祖煜.堆石非线性强度特性对高土石坝稳定性的影响[J].岩土力学,2007,28(9):1807-1810. |
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| 作者姓名： | 陈立宏 陈祖煜 |
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| 作者单位： | 1. 北京交通大学,土木建筑工程学院,北京,100044
2. 中国水利水电科学研究院,北京,100044 |
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| 摘 要： | 抗剪强度指标的选择对大坝坝坡稳定性评价有着十分重要的影响。堆石料抗剪强度具有明显的非线性,在高坝中这一特点更为显著。因此,计算堆石坝坝坡稳定安全系数时应采用非线性指标,而不是传统的线性指标。讨论了不同的堆石料抗剪强度模型、计算参数取值标准、非线性指标的稳定分析方法以及允许安全标准问题。统计分析了171组822个三轴试验结果发现,邓肯非线性指标对堆石料抗剪强度的模拟误差要小于线性指标和德迈洛非线性指标。采用不同的抗剪强度指标计算261.5 m高的云南糯扎渡大坝坝坡的稳定性。结果表明：各种工况下线性有咬合力、邓肯非线性指标与德迈洛非线性指标3种方法得到的安全系数和滑裂面位置都十分接近,非线性指标计算的结果并不比线性指标高。因此,进行非线性分析时,现有规范规定的基于线性指标的允许安全系数标准无需改变。
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| 关 键 词： | 堆石 稳定分析 非线性 抗剪强度 土石坝 |
| 文章编号： | 1000-7598-（2007）09-1807-04 |
| 收稿时间： | 2005-09-14 |
| 修稿时间： | 2005-09-14 |
Effect of nonlinear strength of rockfill on slope stability of high earth-rock dam |
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| CHEN Li-hong,CHEN Zu-yu.Effect of nonlinear strength of rockfill on slope stability of high earth-rock dam[J].Rock and Soil Mechanics,2007,28(9):1807-1810. |
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| Authors: | CHEN Li-hong CHEN Zu-yu |
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| Institution: | 1. School of Civil Engineering and Architecture, Beijing Jiatong University, Beijing 100044, China; 2. China Institute of Water Resources and Hydropower Research, Beijing 100044, China |
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| Abstract: | Shear strength parameters have important effect on the slope stability of earth-rock dam.The Mohr failure envelope for rockfill material is obvious nonlinear particularly under the high stress linear and nonlinear shear strength theroies,value of the parameters,analysis method and safety factor criterion of nonlinear shear strength are discussed.The results of 171 sets of triaxial tests of rockfill reveal that the Duncan nonlinear strength theory is better than other models.The slope stability of 261.5 m high Nuozhadu rockfill dam is analyzed with three different shear strength criterions;the safety factors are almost equal and the positions of potential failure surfaces are also similar to each other.So the allowable safety factor base on linear criterion can be applied without any change when using nonlinear shear strength rules. |
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| Keywords: | rockfill stability analysis nonlinearity shear strength earth-rock dam |
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