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为揭示山区公路桥梁结合部位水毁规律、明确水毁主要原因、完善水毁防治技术,开展无防水毁、浆砌片石和石笼围堰3种工况下的水毁防治模型试验。测定水流流速、水毁堆积物厚度及水毁掏空深度,确认水毁堆积物厚度、掏空深度、水流流速三者与水毁冲刷时间之间的关系。研究表明:无防水毁工况下,模型完全毁坏,其冲刷毁坏过程是渐进的,且有显著的阶段性,水毁堆积物形态以竖直向和水平向堆积物厚度表征;浆砌片石和石笼围堰防水毁工况下,模型完好。
In order to reveal the law of water damage in the joint parts of mountain highway bridges, the main causes of water damage were clarified, the technology of water damage prevention and control was improved, and the model tests of water damage prevention and control under the three conditions of no water damage, mortar rubble and gabion cofferdam were carried out. Determine the flow rate of water flow, the thickness of the damaged sediment and the depth of tunneling to confirm the relationship between the thickness of the destroyed sediment, the depth of tunneling, and the velocity of the water flow and the scouring time. The results show that the model is completely destroyed without watertight damage, and the process of erosion and destruction is gradual with obvious stages. The shape of water-damaged sediment is characterized by vertical and horizontal thickness of deposit; Stone cage cofferdam waterproof damage conditions, the model intact.