Riprap Protection without Filter Layers
Riprap Protection without Filter Layers
复制标题
无过滤层的抛石防护
DOI：
10.1061/(asce)0733-9429(1989)115:12(1615
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发表时间：
1989
影响因子：
2.4
通讯作者：
A. Wörman
中科院分区：
文献类型：
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作者：
A. Wörman
传统的多层抛石和桥墩周围的过滤器保护可以被一层厚的单层抛石所取代。由于这种简单的结构，现场安装不太可能出现缺陷。推导了引起基材侵蚀起始的平均流速与单层保护层和基材特性之间的解析性描述。控制参数描述了抛石层的适宜厚度、抛石物料粒度、基材粒度和平均流速。桥墩的直径对侵蚀的起爆没有影响。通过比较大规模的室内实验验证了理论表达式。在大多数设计条件下，简化抛石防护需要比常规抛石和过滤器防护更薄的保护层。
Conventional multilayered riprap and filter protections around bridge piers can be substituted by one thick single layer of riprap. Because of this simpler construction, field installations are less likely to be defective. An analytical description was derived relating the mean flow velocity, which causes initiation of erosion of the base material, to characteristics of the single‐layer protection and the base material. The governing dimensionless parameters describe suitable thickness of the riprap layer, grain size of riprap material, grain size of base material, and mean flow velocity. The diameter of the pier does not influence initiation of erosion. The theoretical expression was verified by means of comparative largescale laboratory experiments. In most design conditions the simplified riprap protection requires a thinner protective layer than the conventional riprap and filter protection.