漫滩河流桥台冲刷试验研究

发布时间：2018-05-11 15:57

本文选题：漫滩水流 + 水槽试验　；参考：《北京交通大学》2014年硕士论文

【摘要】：洪水期间,河流水位超过滩地高程,水流在主槽和滩地内流动,形成漫滩水流。桥台置于漫滩上将会阻碍水流流动,特别是在河流汛期时,漫滩水流将会对桥台基础形成不可忽视的局部冲刷作用,影响桥梁运营安全。因此,研究漫滩河流桥台周围水流结构及冲刷深度,对桥梁的灾害防御具有重要意义。论文针对漫滩河流桥台周围水流作用下的冲刷问题,通过理论分析和水槽试验,探讨了漫滩河流桥台周围的水流结构特征和冲刷深度变化规律。对影响漫滩河流桥台冲刷深度的主要因素进行了分析,确定了主要因素与漫滩河流桥台冲刷深度的关系。基于试验数据,通过量纲分析与多元回归分析方法建立了漫滩河流桥台最大冲刷深度计算公式。进一步采用前人数据对公式进行了验证,结果表明,本文公式大部分计算值在Sturm公式值与Melville公式值之间,同时与Dongol公式值较为接近,表明本文给出的漫滩河流桥台冲刷计算公式具有较好的可信度。
[Abstract]:During the flood, the water level of the river exceeds the elevation of the beach, and the flow of water flows in the main channel and the beach, forming the floodplain flow. When the abutment is placed on the floodplain, the flow of water will hinder the flow of water, especially in the flood season of the river, the floodplain water will form a local scour on the abutment foundation, which will affect the safety of the bridge operation. Therefore, it is of great significance to study the flow structure and scour depth around abutment of floodplain river. Aiming at the problem of scour around abutment of floodplain river, through theoretical analysis and flume test, the characteristics of water flow structure and the variation of scour depth around abutment of floodplain river are discussed in this paper. The main factors influencing the erosion depth of abutment of floodplain river are analyzed, and the relationship between the main factors and the depth of abutment scour is determined. Based on the experimental data, the formula for calculating maximum scour depth of bridge abutment of floodplain river is established by dimensional analysis and multivariate regression analysis. The results show that most of the calculated values of the formula are between the values of Sturm formula and Melville formula, and are close to that of Dongol formula. The results show that the calculation formula of bridge abutment scour given in this paper has good reliability.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.3

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