深海条件下海燕大桥墩柱防冲刷技术与分析研究

发布时间：2019-05-11 06:09

【摘要】：深海环境修建桥梁墩柱会影响该区域原有的海水运动特征,造成桥梁墩柱局部冲刷破坏。为研究和解决这一问题,以海燕大桥3~#和7~#桥墩为研究对象,在分析其基本地质和水文工程地质条件的基础上,结合现场监测方案,分析了桥梁墩台施工过程中的局部冲刷机理和冲刷深度,并且对照几种普遍的局部冲刷理论公式,提出了对应的防护技术手段。研究发现:深海条件下桥墩主要受上游径流和潮汐两种水力作用影响,并在桥墩两侧产生尾流旋涡和冲刷坑;监测结果表明在桥墩施工期间水流规律紊乱,施工后期水力对河床冲刷速率基本稳定在4mm/d,在监测周期8个月内,3~#、7~#桥梁平均冲刷深度分别为2.23,1.82 m,仅达到理论冲刷深度的8%~10%,说明在桥梁运营中河床还会受到局部冲刷作用;此外,本文提出了针对深水环境下结合主动防护和水流动能减速两类防护技术方案,以期为深海环境下桥梁墩柱的防冲刷技术提供一定参考和数据支撑。
[Abstract]:The construction of bridge piers in deep sea environment will affect the characteristics of sea water movement in this area, resulting in local scour damage of bridge piers and columns. In order to study and solve this problem, the piers of Haiyan Bridge 3 # and 7 # are taken as the research objects, and on the basis of analyzing their basic geological and hydroengineering geological conditions, combined with the field monitoring scheme, This paper analyzes the local scour mechanism and depth of bridge pier and abutment construction, and puts forward the corresponding protection technical means according to several common local scour theoretical formulas. It is found that the pier is mainly affected by upstream runoff and tide under deep sea conditions, and wake vortices and scrubbing pits are produced on both sides of the pier. The monitoring results show that the flow law is disordered during the construction of the pier, and the hydraulic scour rate of the riverbed is basically stable at 4mm 路d in the later stage of construction. Within 8 months of the monitoring cycle, the average scour depth of the bridge is 2.23 and 1.82 m, respectively. It is only 8% / 10% of the theoretical scour depth, which indicates that the river bed will be subjected to local scour in bridge operation. In addition, this paper puts forward two kinds of protection technology schemes for the combination of active protection and water flow energy deceleration in deep water environment, in order to provide some reference and data support for the scour prevention technology of bridge piers and columns in deep sea environment.
【作者单位】：中交第二公路勘察设计研究院有限公司;武汉理工大学;
【基金】：国家自然科学基金(51409200)
【分类号】：U443.8

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