考虑渗流和地震时的砂土边坡稳定性计算

发布时间：2018-04-13 18:02

本文选题：砂土边坡 + 渗流　；参考：《重庆大学学报》2017年01期

【摘要】：基于极限平衡理论,以砂土边坡为研究对象,推导了渗流和地震存在时拟静力法和拟动力法边坡安全系数的计算表达式。通过程序求解,与已有算例对比表明,计算结果基本一致,验证了2种方法解析式的合理性。参数分析表明,水位越高,边坡失稳越严重,水力梯度与安全系数基本为线性关系。渗流方向向下时,稳定性随水力梯度的增加而增大;渗流方向向上时,变化规律相反。水平地震加速度系数对稳定性的影响剧烈,竖向地震加速度系数对稳定性影响较小,简化计算可以忽略不计。最终得出拟静力法的解析式,简单、实用,而拟动力法则可以更为全面地考察砂土边坡稳定性随时间变化的特点。
[Abstract]:Based on the limit equilibrium theory and taking the sandy slope as the research object, the expressions of the safety factors of the pseudostatic method and pseudo-dynamic method in the presence of seepage and earthquake are derived.The results obtained by the program are in good agreement with the existing examples, and the rationality of the two analytical formulas is verified.Parameter analysis shows that the higher the water level, the more serious the slope instability, and the linear relationship between hydraulic gradient and safety factor.When the seepage direction is downward, the stability increases with the increase of hydraulic gradient, while the change law is opposite when the seepage direction is upward.The horizontal seismic acceleration coefficient has a strong influence on stability, while the vertical seismic acceleration coefficient has little effect on the stability, so the simplified calculation can be ignored.Finally, the analytical formula of the pseudostatic method is obtained, which is simple and practical, and the pseudo-dynamic rule can more comprehensively investigate the characteristics of the stability of sandy slope with time.
【作者单位】：防灾科技学院防灾工程系;中国地震局工程力学研究所;中国兵器工业北方勘察设计研究院有限公司;
【基金】：河北省教育厅高等学校科学技术研究项目(ZC2016150) 中国地震局教师科研基金(20120103) 中央高校基本科研业务费专项资金(ZY20150203)~~
【分类号】：TU43

【相似文献】