桥墩基础局部冲刷抛石防护性能波流水槽试验研究

发布时间：2018-01-16 16:13

本文关键词：桥墩基础局部冲刷抛石防护性能波流水槽试验研究　出处：《结构工程师》2017年01期 　论文类型：期刊论文

【摘要】：作为应用最为广泛的桥墩基础局部冲刷防护措施之一,抛石防护受到国内外学者越来越多的关注。通过波流水槽模型试验,研究了抛石粒径、抛石层厚度和抛投范围等主要设计参数对抛石防护效果的影响,并对比分析了中美两国规范关于抛石粒径的选取方法。试验结果表明,合理的抛石配置方式能有效地减小桥墩基础局部冲刷,使冲刷平衡时间延后;抛石层厚度为3~4倍抛石粒径、抛投范围为3倍桩径时,防护效果和经济性较佳;对于抛石粒径的选取,流速较大时,美国规范的计算结果偏大,而中国规范则偏小,流速较小时,建议可以采用工程经验方法确定。
[Abstract]:As one of the most widely used protection measures for local scour of pier foundation, riprap protection has been paid more and more attention by scholars at home and abroad. Through the model test of wave-current flume, the particle size of riprap is studied. The influence of the main design parameters such as the thickness and the casting range of the riprap on the protective effect of the riprap is analyzed and the methods of selecting the particle size of the riprap in the norms of China and the United States are compared and analyzed. The experimental results show that. Reasonable allocation of riprap can effectively reduce the local scour of pier foundation and delay the balance time of scour. When the thickness of the riprap layer is 3 ~ 4 times of the particle diameter and the throwing range is 3 times of the diameter of the pile, the protective effect and economy are better. For the selection of the particle size of riprap, the calculation result of American code is larger than that of Chinese code when the velocity of velocity is larger, and the velocity of velocity is small. It is suggested that the engineering experience method be used to determine the calculation result.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家重点基础研究发展计划(2013CB036304) 上海市人才发展资金资助项目(201548)
【分类号】：U446
【正文快照】： 0引言冲刷是水流作用引起河床剥蚀的一种自然现象。统计资料表明[1-3],水毁事故是造成桥梁灾害的主要原因之一,而超过半数的桥梁损毁与洪水冲刷有关。因此,有必要对桥墩基础进行冲刷防护,以降低桥梁工程水毁事故的发生。根据冲刷防护机理的不同,可将其分为主动防护和被动防护[

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