考虑堆石料软化特性的坝坡动力稳定和滑移变形分析

发布时间：2019-02-25 13:13

【摘要】：对10组已建或拟建工程堆石料低围压下三轴固结排水剪的试验数据进行分析整理,得到相应的峰值强度和残余强度,并拟合出考虑堆石料软化的归一化残余强度曲线。在此基础上,采用有限元动力稳定和滑移分析方法分别进行考虑和不考虑堆石料软化的稳定计算,并对计算结果进行讨论。结果表明:在低围压条件下,堆石料发生应变软化现象,整理的堆石料归一化残余强度曲线可为考虑堆石料软化的有限元动力稳定计算提供参考;地震过程中,无论是坝坡的最小安全系数,还是滑裂面的滑移量,随着加速度峰值的增加,是否考虑软化的计算结果差别逐渐增大。考虑坝坡堆石体的软化,对高面板堆石坝极限抗震能力评价具有重要的意义。
[Abstract]:The experimental data of 10 groups of triaxial consolidation and drainage shear under low confining pressure are analyzed and sorted out, the peak strength and residual strength are obtained, and the normalized residual strength curve considering the softening of rockfill is fitted. On this basis, the finite element dynamic stability analysis method and slip analysis method are used to calculate the stability of rockfill softening considering and without consideration, respectively, and the calculation results are discussed. The results show that under the condition of low confining pressure, strain softening occurs in rockfill, and the normalized residual strength curve of rockfill can be used as a reference for finite element dynamic stability calculation considering rockfill softening. Whether the minimum safety factor of the dam slope or the slip amount of the slip surface increases with the increase of the acceleration peak value the difference between the calculated results of whether or not to take softening into account increases gradually during the earthquake. It is of great significance to evaluate the ultimate seismic capacity of high face rockfill dam by considering the softening of the rockfill body on the slope of the dam.
【作者单位】：海岸和近海工程国家重点试验室(大连理工大学);大连理工大学水利工程学院;
【基金】：国家自然科学基金项目(51279025,51379028,51508071)
【分类号】：TV641

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