Seismic stability analysis of three-dimensional reinforced slope based on pseudo-dynamic method

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), pet.2024, Vol.47 No.9: 1288-1296

DOI: 10.3969/j.issn.1003-5060.2024.09.020

Authors

WANG Zhen $ ^{1} $, SUN Zhibin $ ^{1} $, YANG Shengyu $ ^{1} $, NIE Xiupeng $ ^{1} $, TAN Xiaohui $ ^{2} $

(1. School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China; 2. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: The pseudo-dynamic method can better consider the spatial and temporal variation characteristics of earthquake propagation. In this paper, the pseudo-dynamic analysis method is used to study the three-dimensional seismic stability of reinforced soil slopes under two different reinforcement modes of uniform reinforcement and triangular reinforcement. Based on the upper limit theorem of limit analysis, the failure mechanism of three-dimensional reinforced soil slope is constructed, the expression of three-dimensional safety factor of seismic slope is derived, and the difference between pseudo-static and pseudo-dynamic analysis results is investigated. The variation law of pseudo-dynamic safety factor of three-dimensional reinforced soil slope is revealed by parameter analysis. The results show that the safety factor solution obtained by pseudo-static analysis is more conservative than that obtained by pseudo-dynamic analysis, especially when the horizontal seismic force coefficient $ k_{h} $ and slope angle $ \beta $ are larger, the difference is more significant. With the increase of horizontal seismic force coefficient $ k_{h} $, ratio of slope width to height B/H and amplification factor f, the stability of reinforced soil slope decreases obviously, while the stability of reinforced soil slope increases with the increase of average reinforcement strength $ k_{0} $. The influence of seismic wave period T on slope stability is small, the influence of two reinforcement modes on slope stability is the same, and the effect of triangular reinforcement mode is better.

Keywords: slope engineering; three-dimensional stability analysis; pseudo-dynamic method; reinforcement mode; upper limit theorem; safety factor

作者信息

王振 $ ^{1} $，孙志彬 $ ^{1} $，杨胜宇 $ ^{1} $，聂秀鹏 $ ^{1} $，谭晓慧 $ ^{2} $

(1. 合肥工业大学汽车与交通工程学院，安徽合肥 230009；2. 合肥工业大学资源与环境工程学院，安徽合肥 230009)

摘要和关键词

摘要: 拟动力法可以更好地考虑地震传播的时空变化特性,文章采用拟动力分析方法研究均匀加筋与三角加筋2种不同加筋模式下,加筋土坡的三维地震稳定性问题;基于极限分析上限定理,构建三维加筋土边坡的破坏机构,推导地震边坡三维安全系数的表达式,并考察拟静力与拟动力分析结果之间的差异性;通过参数分析揭示三维加筋边坡的拟动力安全系数变化规律。结果表明:相对于拟动力分析,拟静力分析获得的安全系数解更为保守,特别是对于水平地震力系数 $ k_{h} $和坡角 $ \beta $较大的情况,两者差异更加显著;随着水平地震力系数 $ k_{h} $、宽高比B/H、放大系数f的增加,加筋土边坡的稳定性明显降低;而随着平均加筋强度 $ k_{0} $增加,边坡稳定性显著提高;地震波周期T对边坡稳定性的影响较小;2种加筋模式对边坡稳定性的影响规律一致,且三角加筋模式效果更优。

关键词: 边坡工程；三维稳定性分析；拟动力法；加筋模式；上限定理；安全系数

Funding

国家自然科学基金资助项目（41972278）；中央高校基本科研业务费专项资金资助项目（JZ2020HGTB0042）

合肥工业大学学报(自然科学版)

Navigation