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为进一步揭示公路桥梁工程中路桥结合部位水毁破坏规律,依据Fr相似准则,采用正交试验设计方法,着重探析模型伸入水流长度、与水流方向夹角、坡比及有无防护措施对模型水毁破坏的影响程度;ADINA有限元数值计算与模型试验对比分析,两者相吻合。研究表明:模型伸入水流长度分别设为20,40 cm和60 cm工况条件下,水流冲刷或浸泡作用对模型结构体造成的破坏程度逐渐加深,亦即模型伸入水流长度越长,水流对模型结构体破坏程度越严重;模型与水流方向夹角分别设为45°,90°和135°工况条件下,当模型与水流方向夹角为135°时,模型结构体受水流冲刷或浸泡作用后在其周围形成的堆积物体积量大且分散,冲刷深度显著,模型几乎完全破坏;设有一定坡比的模型,坡面能使水流流速产生有效分解,具有较强的抗冲刷能力;采取注浆层或围堰防护措施可对模型结构体起到完全的保护作用。
In order to further reveal the rule of water damage of road-bridge junction in highway bridge engineering, according to the similarity criterion of Fr, orthogonal experimental design method is adopted to analyze the relationship between model extension water flow length, angle with flow direction, slope ratio and protection measure The extent of the damage caused by water damage; ADINA numerical simulation and model tests comparative analysis, the two coincide. The results show that under the working conditions of 20, 40 cm and 60 cm, respectively, the damage caused by water scouring or soaking gradually deepens the model structure. That is, the longer the model extends into the water flow, the longer the water flow The more serious the damage to the model structure; the angle between the model and the flow direction is set to 45 °, 90 ° and 135 ° respectively. When the angle between the model and the flow direction is 135 °, the model structure is washed by the water flow or After soaking, the volume of sediment formed around it is large and dispersed, the depth of scour is significant, and the model is almost completely destroyed. The model with a certain slope ratio can effectively decompose water flow velocity and has strong anti-scour ability ; Take the grouting layer or cofferdam protection measures can play a complete model structure protection.