路桥结合部位水毁破坏规律研究

发布时间：2018-02-14 08:11

本文关键词： 桥梁工程水毁破坏规律模型试验路桥结合部位影响程度数值计算　出处：《公路交通科技》2017年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to further reveal the damage law of road and bridge joint in highway and bridge engineering, according to the Fr similarity criterion, the orthogonal test design method is used to analyze the length of the flow and the angle between the model and the direction of the flow. The slope ratio and the degree of influence of protective measures on the damage of the model are compared and analyzed by Adina finite element numerical calculation. The results show that the flow length of the model is 2040 cm and 60 cm, respectively. The damage degree of the model structure caused by the scour or immersion of the water flow is gradually deepened, that is, the longer the flow length of the model is, the more serious the damage degree is to the model structure body caused by the water flow. When the angle between the model and the flow direction is set to be 45 掳/ 90 掳and 135 掳, respectively, when the angle between the model and the flow direction is 135 掳, the volume of the deposits formed around the model structure is large and dispersed, and the scour depth is obvious, when the angle between the model and the flow direction is 135 掳. The model is almost completely destroyed, with a certain slope ratio, the slope can decompose the flow velocity effectively and has a strong anti-scour ability, and the protective measures of grouting layer or cofferdam can completely protect the model structure.
【作者单位】：辽宁工程技术大学土木工程学院;东北大学资源与土木工程学院;
【基金】：国家自然科学基金项目(51504123) 辽宁省教育厅一般项目(L2015211)
【分类号】：U418.54;U445.7

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