Scour reduction in sand beds against vertical jets by applying sheet-like countermeasures

Scour reduction in sand beds against vertical jets by applying sheet-like countermeasures
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通过应用片状对策减少沙床对垂直射流的冲刷

DOI:
10.1080/1064119x.2020.1737893
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发表时间:
2020
影响因子:
2.2
通讯作者:
Kawabata Toshinori
Kawabata Toshinori
中科院分区:
工程技术3区
文献类型:
--
作者:
Takegawa Naoki;Sawada Yutaka;Kawabata Toshinori

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在海堤和海岸堤坝等海岸防护设施后面的陆侧地面上观察到的由海啸溢流引起的冲刷是此类建筑物失败的主要原因。在这项研究中,我们专注于片状(二维)冲刷对策,这不需要大规模挖掘的地面,并通过实验验证了土工网和网格片的效果。通过直接在地面上施加垂直射流并增加外力,再现了接近真实的尺度条件的情况。试验结果表明,土工网材料能够显着减少非液化和液化地面上的冲刷深度。我们表明,在最有效的情况下,最大孔隙水压力和冲刷深度减少约91%和86%,分别由砂床表面的网格片。
The scour observed at the landside ground behind coastal protection facilities, such as seawalls and coastal dikes, due to tsunami overflows is the main reason for failures in such constructions. In this study, we focused on sheet-like (two-dimensional) scour countermeasures, which do not require large-scale excavation of the ground, and experimentally verified the effects of geonet and mesh sheets. By applying a vertical jet directly on the ground and increasing the external force, a situation close to the real scale conditions was reproduced. The experimental results show that the geonet material is able to significantly reduce the scour depth on both non-liquefied and liquefied grounds. We show that in the most effective case, the maximum pore-water pressure and the scour depth are reduced by about 91% and 86%, respectively, by the mesh sheet on the sand-bed surface.
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