Geotechnical considerations in hydraulic modeling of bridge abutment scour
Geotechnical considerations in hydraulic modeling of bridge abutment scour
复制标题
桥台冲刷水力建模中的岩土工程考虑
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
E. Kempema
中科院分区：
文献类型：
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作者：
K. W. Ng;R. Chakradhar;R. Ettema;E. Kempema
桥梁水道土质桥台与冲刷相关的破坏涉及相互作用的岩土工程和水力过程。然而，当前的桥梁设计指南没有充分考虑影响冲刷深度的岩土工程因素。我们的论文介绍了实验室实验的结果，研究了土壤强度如何影响溢流桥台的冲刷深度。我们重点关注在易蚀土壤形成的桥台上进行冲刷水槽实验时遇到的几个困难。困难包括获得缩小规模的剪切强度、控制土壤压实以及量化模型土壤的剪切强度。我们指出了所涉及的相似性考虑因素，并描述了将模型土壤强度与土壤压实相关的土壤测试过程，该过程使用手持设备来确定土壤强度。土壤压实度和抗剪强度之间的相关性有助于解决水槽实验中的一些困难。我们针对与模拟桥台冲刷水槽研究中使用的压实土的剪切强度相关的问题提出了实用的解决方案。
Scour-related failure of earthen abutments in bridge waterways involves interacting geotechnical and hydraulic processes. Current bridge design guides, however, inadequately account for geotechnical factors influencing scour depth. Our paper presents results of laboratory experiments investigating how soil strength affects scour depth at spill-through abutments. We focus on several difficulties faced when conducting flume experiments on scour at abutments formed of erodible soil. The difficulties include attaining scale-reduced shear strengths, controlling soil compaction, and quantifying the shear strength of model soil. We indicate the similitude considerations involved, and describe a process of soil tests relating model soil strength to soil compaction that uses hand-held devices to determine soil strengths. The correlations developed between soil compaction and shear strength helped to work around some of the difficulties in flume experiments. We suggest practical solutions to issues pertaining to simulating the shear strength of compacted soils used in flume studies of abutment scour.