摘要
挡土墙顶部雪荷载以及融雪的渗入会对挡土墙的稳定性产生负面影响。基于极限分析上限定理,对墙后土体采用斜条分法,将墙后土体划分为无限个平行于滑裂面的刚性土条,并建立挡土墙转动破坏模型,将Green-Ampt渗流模型与雪荷载和融水渗透的综合影响结合起来。运用极限分析上限定理,推导积雪影响的重力式挡土墙抗倾覆安全系数的最小上限解,并考虑了填土倾角α、墙-土界面摩擦角δ、渗流时间t以及含水量θ_(i)、θ_(s)等参数的影响。研究结果表明,随着渗流时间的增加,雪荷载逐渐减小,回填土中渗流水增加,挡土墙抗倾覆安全系数呈现先增大后减小的趋势。通过与数值模拟结果进行对比,验证了该文方法的有效性。
The snow load on top of the retaining wall and the infiltration of melting snow can negatively affect the stability of the retaining wall.Based on the limit analysis upper limit theorem,the soil behind the wall is divided into an infinite number of rigid soil strips parallel to the slip fracture surface by using the slant strip division method,and a rotational damage model of the retaining wall is established to combine the Green-Ampt seepage model with the combined effects of snow load and meltwater infiltration.The limit analysis upper bound theorem is applied to derive the minimum upper bound solution for the snow-influenced gravity retaining wall’s overturning resistance factor of safety,and the effects of parameters such as fill inclination angle α,wall-soil interface friction angleδ,seepage time t,and water content θ_(i) and θ_(s) are taken into account.The analysis results show that with the increase of seepage time,the snow load decreases gradually,the seepage water in the backfill increases,and the retaining wall overtopping safety coefficient shows a tendency of increasing first and then decreasing.By comparing with the numerical simulation results,the effectiveness of the method of this paper is verified.
作者
刘杰
白佳豪
苏靖海
LIU Jie;BAI Jiahao;SU Jinghai(School of Civil Engineering,Hebei University of Engineering,Handan 056000,China;Shijiazhuang Municipal Housing and Construction Group Construction Engineering Testing Service Co.,Ltd.,Shijiazhuang 050000,China)
出处
《自然灾害学报》
北大核心
2025年第5期151-161,共11页
Journal of Natural Disasters
