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沿河路基缺口是河道水流冲刷、淹没浸泡、冲击磨蚀联合作用削弱路基结构抗灾能力和稳定性的结果。根据路基缺口水毁的宏观表象和失稳力学模式,将沿河路基缺口类型概化为滑动失稳型、倾倒失稳型和坠落失稳型3类,进一步将3类路基缺口的形成机制分别概括为水动力荷载作用下路基结构的压剪断裂、拉裂倾倒和拉剪断裂导致的突发性动力失稳机制。路基岩土体抗冲失能力、抗拉强度和抗剪强度是体现路基抵抗缺口破坏的关键参数。将沿河路基外侧边坡在洪水作用下发生缺口概化为冲失→冲失槽→坍塌缺口的3阶段宏观演绎过程,差异冲失累积是关键,悬空路基断裂失稳是核心。
The embankment along river embankment is the result of river water scour, submerged immersion and impact abrasion to weaken the resilience and stability of roadbed structure. According to the macroscopic representation and the unstability mechanics model of the subgrade water damage, the types of the embankment along the embankment are generalized to three types: slip instability type, pouring instability type and falling instability type, respectively This paper summarizes the sudden dynamic instability caused by the compression-shear fracture, the tensile fracture and the tensile-shear fracture of the subgrade structure under hydrodynamic loads. The impact resistance, tensile strength and shear strength of embankment are the key parameters to reflect the damage of roadbed. The occurrence of flood under the side slope of embankment along the embankment can be generalized as a 3-stage macro deduction process from loss → sinking → collapse. The accumulation of differential erosion is the key point, and the failure instability of suspended subgrade is the core.