上覆粗砂层河床群桩基础冲刷特性试验

Journal of Tongji University(Natural Science)(2017)

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Abstract
采用波流水槽试验,针对上覆粗砂层双层砂土进行局部冲刷机理研究,并与中国和美国规范的局部冲刷深度计算方法对比分析.试验研究表明:由于上覆粗砂层的存在,冲刷前期进展缓慢,后期主要为细砂层冲刷,发展较快;而上覆粗砂层对下卧细砂层冲刷起到抑制作用,粗砂层越厚,抑制效果越明显;中美规范对于上粗下细双层砂土局部冲刷深度计算结果偏大,应进行适当折减,以更为合理地反映粗砂层对细砂层冲刷的影响.
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Key words
flume,non-cohesive soils,scour depth,comparison of specifications
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