| 土石坝失稳的尖点突变模型与临界条件 |
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| 引用本文： | 胡建平,刘亚莲,周翠英.土石坝失稳的尖点突变模型与临界条件[J].四川建筑科学研究,2011,37(5):127-130. |
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| 作者姓名： | 胡建平 刘亚莲 周翠英 |
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| 作者单位： | 1. 广东水利电力职业技术学院,广东广州,510635
2. 中山大学工学院,岩土工程与信息技术研究中心,广东广州510275 |
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| 基金项目： | 广东省自然科学基金资助项目(07006119) |
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| 摘 要： | 土石坝是一个复杂的非线性系统,其失稳过程的力学行为是一个不可逆的非线性动力学演化过程。根据土石坝的特点,应用突变理论,建立了一个考虑坝体材料应变软化效应和水致弱化效应的尖点突变模型,通过对模型进行平衡分析,获得了坝坡失稳的力学判据。通过对失稳判据的分析得出,土石坝发生突变失稳的必要条件,取决于坝体材料特性、库水位及库水位变化情况,高洪水位或由高水位骤降时因坝坡上部材料刚度降低而容易发生突滑失稳,是坝坡稳定的控制工况。最后,根据系统突变条件得出了坝坡失稳的临界位移和临界几何—力学参数,为土石坝稳定分析和安全评价提供新的途径。
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| 关 键 词： | 土石坝 失稳 尖点突变模型 临界条件 |
The cusp catastrophe model of the instability of earth-rock dam and critical conditions |
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| HU Jianping,LIU Yalian,ZHOU Cuiying.The cusp catastrophe model of the instability of earth-rock dam and critical conditions[J].Building Science Research of Sichuan,2011,37(5):127-130. |
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| Authors: | HU Jianping LIU Yalian ZHOU Cuiying |
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| Affiliation: | HU Jianping1,LIU Yalian1,ZHOU Cuiying2(1.Guangdong Technical College of Waster Resources and Electric Engineering,Guangzhou 510635,China,2.School of Engineering Research Center for Geotechnical Engineering & Information Technology,Sun Yat-sen University,Guangzhou 510275,China) |
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| Abstract: | Earth-rock dam is a complex nonlinear system,its mechanical behavior when the dam slope is instable is in fact an irreversible evolution of nonlinear dynamics.In this paper,a cusp catastrophe model,which covers strain-softening effect of dam material and water-weakening effect,is constructed,based on the characteristics of earth-rock dam,applied catastrophe theory,and through the analysis of equilibrium of model,the mechanical criterion of instability of the dam slope is obtained,through the analysis of ins... |
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| Keywords: | earth-rock dam instability cusp catastrophe model critical conditions |
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