渗透-浸泡耦合作用下沿河路基沉陷机制

Riverside Roadbed Subsidence under Action of Penetration-soaking Coupling Mechanism

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 road water logging along the river. The periodic fluctuations of river water level and roadbed soil＇s long suffering from the water soak softening are the main induce factors for riverside roadbed subsidence. Based on the unsaturated soil mass suction penetration theory and simplified roadbed model, Swedish circle method is used to establish roadbed stability coefficient calculation formula. Example analysis shows that when soil roadbed suffers the water permeability-soak, roadbed＇s stability reduces with the time, and may lead to roadbed subsidence. Research results has a positive meaning for improving the recognition level of roadbed subsidence water logging mechanism.