| 摘要: |
| 【目的】考察施工间歇期路基侧向位移的发展特性,为路基侧向位移测量提供依据。【方法】基于非线性有限元方法,对路堤分阶段填筑过程中路基的变形特性进行了系统考察,同时分析了路基最大侧向位移的位置及其测量技术。【结果】对比分析表明,在硬壳层强度较高、软土层厚度较大的情况下,路基体内的侧向位移有可能在施工间歇期发生回缩,该现象伴随着竖向沉降的大幅度增长而发生;工程中常用的测斜管在考察侧向位移的过程中存在许多缺陷,利用其较难探测到侧向位移的回缩现象;在路堤分阶段填筑过程中,路基最大侧向位移的位置是变化的。【结论】需发展更精密的仪器来测量路基体内侧向位移的发展情况，建议将测斜管埋设于坡趾竖向断面和坡中竖向断面之间。 |
| 关键词: 道路工程 非线性有限元 路堤 侧向位移 测斜管 |
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| 基金项目:安徽省自然科学基金项目(1208085QE89);住房和城乡建设部研究开发项目(2010－K3－7) |
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| Lateral displacement analysis of soft soil foundation under embankment |
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| Abstract: |
| 【Objective】In order to better measure lateral displacement of road,the characteristics of lateral displacement of soft soil foundation under embankment were studied.【Method】A typical embankment was studied systemically with nonlinear finite element method,and the location of maximal lateral displacement and its measuring method were also discussed.【Result】Comparison analysis showed that lateral displacement,which happened synchronously with vertical settlement increased rapidly,would be reduced possibly at consolidation stage with strong dry crust and thick soft soil layer.Inclinometer pipe could not measure this phenomenon conveniently due to its shortcomings,although it had been used in engineering widely.It is also shown that the location of the maximal lateral displacement was changeable at different construction stages.【Conclusion】The technique and instrument should be improved to measure lateral displacement accurately.It is suggested that the inclinometer pipes should be placed between vertical surfaces of the toe and the middle slope of embankment. |
| Key words: road engineering nonlinear finite element method embankment lateral displacement inclinometer pipe |
