三维加筋边坡抗震稳定性的拟动力上限分析  

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

作　　者：王振 孙志彬 杨胜宇 聂秀鹏 谭晓慧[2] WANG Zhen;SUN Zhibin;YANG Shengyu;NIE Xiupeng;TAN Xiaohui(School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei 230009,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[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

出　　处：《合肥工业大学学报（自然科学版）》2024年第9期1288-1296,共9页Journal of Hefei University of Technology：Natural Science

基　　金：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)。

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β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。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 angleβare 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.

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 

分 类 号：U416.14[交通运输工程—道路与铁道工程]