摘要
铁路路堤稳定性分析是路堤设计、施工和运营阶段的关键,其影响因素很复杂。以典型的双线铁路路堤模型为基础,采用传统的瑞典条分法对铁路路堤施工期和运营期的稳定性分别进行了计算,对得到的稳定安全系数进行了系统分析,讨论了路堤高度、地基土类型及固结程度、地基土抗剪强度参数等对铁路路堤稳定性的影响。结果表明:随着路堤的增高,稳定安全系数呈双曲线的递减趋势;在施工期,考虑地基土固结时得出的稳定安全系数均大于不考虑固结时的结果,两者之间具有良好的线性相关性。从安全角度考虑,建议铁路路堤填筑完建期的稳定性分析采用快剪指标,对于软弱地基,还应考虑地基土的固结强度增长;放置与铺轨期和运营期的稳定性检算宜采用固快指标。
The stability analysis of railway embankment is the key problem in design,construction and operation stage.The influence factors are very complicated.On the basis of the typical double line railway embankment model and by using traditional Fellenius method,the stability of construction and operation period is calculated.The parameters,such as embankment height,foundation soil type,consolidation and shear strength,which have influence on the safety factor,have been studied systematically.The results of analysis show that： with the increase of embankment height,the safety factor is decreased in a hyperbola form;in the construction period,the safety factor considering consolidation is larger than the one without considering consolidation.From the view of engineering safety,it is suggested that the stability analysis of railway embankment in filling completion period should adopt the quick direct shear parameters and consider the consolidation for the soft foundation,and in track-laid or operation period should use the consolidated quick direct shear parameters.
出处
《长江科学院院报》
CSCD
北大核心
2010年第6期49-53,共5页
Journal of Changjiang River Scientific Research Institute
关键词
铁路路堤
稳定性
影响因素
固结
railway embankment
stability
influence factor
consolidation
