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路基沉陷是公路水毁主要类型之一,河水位的周期性涨落以及路基土体长时间遭受河水浸泡软化是诱发沿河公路路基沉陷的主要诱因。基于非饱和土体吸水渗透理论和简化路基模型,运用瑞典圆弧法建立了路基动态稳定系数计算式。实例分析表明,当土质路基受到河水渗透-浸泡耦合作用时,路基整体稳定性随时间逐渐降低,并可能发生沉陷破坏。研究成果对于提升路基沉陷水毁机制认识水平有积极意义。
Roadbed subsidence is one of the main types of highway water damage. The cyclical fluctuation of river level and submergence of subgrade soils for a long time are the main inducing factors for subgrade subsidence of highway along river. Based on the unsaturated soil water infiltration theory and simplified embankment model, the formula of dynamic stability factor of subgrade was established by Swedish arc method. The case study shows that the overall stability of subgrade gradually decreases with time and the subsidence may occur when soil subgrade is subjected to infiltration and soaking of river water. The research results have positive significance for raising the level of understanding of subsidence and water damage mechanism of roadbed.