降雨条件下不良填筑路基破坏过程物理模拟

为研究不良填筑路基在降雨条件下变形破坏机制，采用相似材料和物理模拟实验方法再现填方路基变形破坏全过程，揭示降雨和软弱夹层与不良填筑路基变形破坏的内在联系。研究表明，雨水和坡后汇聚水流大量下渗，路基自重增加，下滑推力增大，坡体应力条件发生显著改变。软弱夹层相对隔水，下渗雨水在软弱夹层上运移受阻，夹层浸水软化，于坡体稳定性产生不利影响。路基内部碎屑颗粒含量大，进而堵塞地下水消散通道，孔隙水压力持续增加，加剧坡体变形，最终导致路基失稳。该路基破坏过程可分为：水流下渗、坡体应力调整、后缘拉裂缝形成、裂缝贯通-整体破坏四个阶段。

Physical Simulation Study on Failure Process of Bad Fill Roadbed under Rainfall Condition

In order to study the deformation and failure mechanism of bad filling roadbed under the condition of rainfall, the whole process of deformation and failure of bad filling roadbed is reappeared by using similar materials and physical simulation methods, to reveal the internal relationship between rainfall and weak interlayer and bad filling roadbed. The results show that when the rainwater and the slope gather water, the subgrade weight increases, the sliding thrust increases, and the stress condition of the slope body changes significantly. The weak interlayer is relatively waterproof, and the movement of rainwater from infiltration is obstructed on the weak interlayer. The large content of debris particles in the roadbed will block the dissipation channel of groundwater, and the pore water pressure will continue to increase, aggravating the deformation of the slope body and eventually leading to the instability of the roadbed. The failure process of the subgrade can be divided into four stages: water infiltration, slope stress adjustment, rear edge tensile fracture formation, the crack penetration - overall failure.