摘要
针对某高速公路软基段碎石桩复合地基路基工程失稳案例,通过建立合理有限元模型,模拟碎石桩复合地基上路堤分层填筑施工过程,"再现"路堤荷载下碎石桩复合地基的变形过程和破坏模式,分析了碎石桩处治软基的失效原因。由此得出路堤工程失稳的原因可能在于地基条件特殊,设计方面对软土的估计不足,以及施工过程中路堤堆载速度过快三方面。基于模拟分析结果,提出了山区公路路基软土地基加固的建议。
Amid at an example of embankment failure in gravel pile composite foundation in soft foundation in a freeway. A reasonable finite element numerical model is employed to simulate the construction process of embankment layer filling in gravel pile composite foundation. The deformation process and fail- ure mode for gravel pile composite foundation by embankment load is ＂reappeared＂ ,the failure reasons of soft foundation handled by gravel pile is analysed. The three main factors causing the embankment failure are special foundation features, overestimation of soft soils in design, and too fast embankment load speed in construction. Based on the simulation analytic results, the suggestions for mountainous area soft foundation improvement are provided in the end.
出处
《勘察科学技术》
2014年第6期9-12,34,共5页
Site Investigation Science and Technology
关键词
路堤工程
变形
稳定性
有限元分析
山区软基
碎石桩复合地基
embankment engineering
deformation
stability
finite elements analysis
mountainous area soft foundation
gravel pile composite foundation
