摘要
多级悬臂式挡墙是路堤边坡的一种新型支挡结构。根据数值模拟得到的此类边坡整体失稳破坏模式近似采用经过最下一级挡墙墙踵板下边缘的对数螺旋面模式,并依据极限分析上限定理来分析墙坡整体稳定性;推导了边坡稳定系数的相关计算公式,可通过迭代搜索计算求解边坡最小稳定系数及其相应的潜在滑面。实例分析表明,与经典的极限平衡条分法相比,所给出的极限分析上限法得到的稳定系数更接近于数值模拟结果,且滑面形态也与数值模拟结果较接近;同时,墙坡整体稳定系数与墙后填土内摩擦角、填土重度及各级挡墙墙踵板长度均呈较显著的正相关关系,而这3个因素对滑面形态的影响则相对较小。
Multi-stage cantilever retaining wall is a new retaining structure for embankment slope.According to thefailure mode of this kind of slope obtained by numerical simulation,the logarithmic helical plane mode passing throughthe lower edge of the heel plate of the retaining wall of the lowest level was approximately adopted,and the globalstability of the slope was analyzed according to the upper limit theorem of limit analysis.The relevant calculation formulaof slope stability coefficient was derived.The minimum stability coefficient and its corresponding potential slidingsurface can be solved by iterative search calculation.The results show that,compared with the classical limitequilibrium slice method,the stability coefficient obtained by the limit analysis upper bound method is closer to thenumerical simulation results,and the sliding surface shape is also closer to the numerical simulation results.At thesame time,the global stability coefficient of the wall slope is significantly positively correlated with the internal frictionangle of the backfill,the weight of the fill and the heel length of the retaining wall at all levels.However,these threefactors have relatively small influence on the form of the sliding surface.
作者
李昭颖
肖世国
LI Zhaoying;XIAO Shiguo(Department of Geological Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High-speed Railway Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道建筑》
北大核心
2020年第12期92-96,共5页
Railway Engineering
基金
国家自然科学基金(51578466)。
关键词
公路路基
边坡稳定性
理论分析
多级悬臂式挡墙
极限分析
破坏模式
稳定系数
highway subgrade
slope stability
theoretical analysis
multi-stage cantilever retaining wall
limitanalysis
failure mode
stability coefficient
