Preliminary Assessment and Rating of Stream Channel Stability near Bridges
Preliminary Assessment and Rating of Stream Channel Stability near Bridges
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桥梁附近河道稳定性的初步评估和评级
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
P. Johnson
中科院分区：
文献类型：
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作者：
P. Johnson
在美国，桥梁失效的主要原因是桥梁基础周围的冲刷和渠道不稳定。需要评估桥梁附近渠道稳定性的能力，以提醒工程师注意桥梁基础可能出现的不稳定状况，设计稳定的道口，并减轻这些结构的侵蚀。这些信息对河流稳定项目也很有价值，特别是在要恢复的河段包括一座桥的情况下。然而，目前还不存在适用于位于该国不同地区的桥梁的快速评估渠道稳定性的系统方法。在这项研究中，基于先前的稳定性评估方法以及对美国大陆13个地形区桥梁的观测，开发了一种桥梁附近渠道稳定性的初步文件和评级评估方法。该方法可评估影响桥梁基础的渠道稳定性条件。它的目的是快速评估条件，以便记录桥梁条件，并判断是否需要更广泛的地貌研究或完整的水力和泥沙运输分析，以评估某一特定桥梁未来可能出现的不利条件。
The primary cause of bridge failure in the United States is scour and channel instability around the bridge foundations. The ability to assess channel stability in the vicinity of bridges is needed to alert engineers to possible unstable conditions at the bridge foundations, to design stable road crossings, and to mitigate against erosion at those structures. This information is valuable for stream stabilization projects as well, particularly for cases where the reach to be restored includes a bridge. However, a systematic methodology for rapidly assessing channel stability that is applicable at bridges located in the various regions of the country does not currently exist. In this study, an assessment method for the preliminary documentation and rating of channel stability near bridges was developed, based on prior stability assessment methods as well as observations at bridges in 13 physiographic regions of the continental United States. This method provides an assessment of channel stability conditions as they affect bridge foundations. It is intended for a quick assessment of conditions for the purpose of documenting conditions at bridges and for judging whether more extensive geomorphic studies or complete hydraulic and sediment transport analyses are needed to assess the potential for adverse conditions developing at a particular bridge in the future.