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三峡水库泄水期间类土质岸坡渗流驱动压剪破坏机制研究 被引量:4

Study on Compression-shear Failure Mechanism by Seepage-driving for the Quasi Earthy Bank Slope during the Drawdown in Three Gorges Reservoir
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摘要 基于水库水位降落期间渗流驱动力对类土质岸坡的压剪作用,建立了类土质岸坡渗流驱动压剪力学模型,改进了水库水位降落期间渗流驱动力的计算方法,提出了渗流驱动压剪破坏判据。以三峡水库青石岸坡为例,渗流驱动压剪破坏机制可以解释青石岸坡水位降落期间的破坏现象。此外还探讨了水库水位降落速度、时间以及初始水位高度对渗流驱动力与岸坡稳定性的影响,并得出如下结论:渗流驱动力随水库水位降落速度的增加而非线性增大;渗流驱动力随初始水位高度增加呈现为线性降低的趋势;青石岸坡稳定系数不随水位降落速度、水位降落时间的变化而变化。 For the problem of seepage failure and based on compression-shear acting on the quasi earthy bank slope by seepage-driving force during the drawdown in Three Gorges reservoir,compression-shear failure model by seepage-driving force was established in this paper,and the calculation method of seepage-driving force was improved,then compression-shear failure criteria by seepagedriving for the quasi earthy bank slope was imposed.Taking the example of Qingshi bank slope,the compression-shear failure mechanism by seepage-driving force was identical to the failure of Qingshi bank slope during the drawdown by verification.The effect on seepage-driving force and stability of bank slope by the falling velocity of the reservoir water level,time and the initial water level were discussed in this paper,which obtained that seepage-driving force increased nonlinearly with the growth of the falling velocity of the reservoir water level;seepage-driving force decreased linearly with the growth of the initial reservoir water level;stability coefficient of Qingshi bank slope decreased nonlinearly with the growth of the falling velocity but was invariable with the falling time of the reservoir water level.
出处 《重庆师范大学学报(自然科学版)》 CAS CSCD 北大核心 2016年第6期37-44,共8页 Journal of Chongqing Normal University:Natural Science
基金 国家自然科学基金(No.51378521) 重庆市自然科学基金重点项目(No.cstc2013jjB005) 国土资源部公益性行业科研专项项目(No.201511051) 中国地质调查项目(No.DD2016278)
关键词 岩土力学 渗流驱动力 压剪破坏 类土质岸坡 三峡水库 rock and soil mechanism seepage-driving force compression-shear failure the quasi earthy bank slope Three Gorges reservoir
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