摘要
以某高速铁路隧道出口边坡为研究对象,在边坡工程地质条件、岩体结构特征及变形破坏特征调查分析的基础上,阐明了边坡的变形破坏模式为受卸荷结构面控制的块体顺坡向滑塌破坏。通过建立边坡的三维数值模型,对比分析了边坡在天然工况(施工平台及隧道开挖前)和列车震动荷载工况下,沿隧道走向剖面上的应力、变形及剪应变增量变化特征,并分析了施工平台开挖及列车震动荷载对边坡稳定性的影响,得出了施工平台开挖及列车震动荷载,可能在开挖面附近及坡内软岩夹层中引起局部的变形破坏,对边坡整体稳定性影响较小的结论。
Based on the investigation of the engineering geology,rock structure and deformation and failure characteristics of the high-speed railway tunnel exit slope, this paper expounds that the deformation and failure mode of the slope is blocks slip down along unloaded structural planes. By three-dimensional numerical simulation, the stress, deformation and shear strain increment along the tunnel profile in natural conditions（before the platform and the tunnel excavation） and train vibration load conditionc is analyzed, and the influence of the excavation of the platform and the train vibration load on the slope stability is analyzed. It is concluded that the excavation of the platform and the train vibration load may cause local deformation in the vicinity of the excavation surface and the soft rock interlayer,and they have little effect on the overall stability of the slope.
作者
李华东
邹超群
Li Huadong;Zou Chaoqun(AVIC Institute Geoteehnieal Engineering Co,Ltd,Beijing 100098.China)
出处
《岩土工程技术》
2018年第4期177-182,共6页
Geotechnical Engineering Technique
关键词
列车震动荷载
边坡
变形破坏模式
稳定性
train vibration load
slope
deformation and failure mode
stability
