Local scour around tandem square porous piles in steady current
Local scour around tandem square porous piles in steady current
复制标题
恒流下串联方形多孔桩周围的局部冲刷
DOI：
10.1016/j.oceaneng.2021.109554
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发表时间：
2021
影响因子：
5
通讯作者：
Liang Bingchen
中科院分区：
文献类型：
--
作者：
Yang Fan;Qu Lili;Zhang Qin;Tang Guangqiang;Liang Bingchen
在动床水流条件下，进行了多孔性串联方桩在恒定流场中的局部冲刷试验研究。通过对局部冲刷发展过程的测量，定量分析了前后桩孔隙率（P= 0 ~ 38.5%）和差距比（G/D= 2-12）对局部冲刷发展的影响，并对时间尺度、三维冲刷剖面和冲刷特征进行了分析。针对前后堆的孔隙率分布，确定了三种状态。其显著特征是前壁孔隙度小于后壁孔隙度。当G/D< 4时，可识别为整体冲刷。由于观察到落在后桩周围的沉积物存款与其弱侵蚀之间的权衡，后桩的冲坑尺寸首先减小。桩间孔隙率的差异决定了桩间最小冲刷尺寸的临界间隙比。
Experimental study on the local scour around tandem square porous piles in steady current has been carried out in the live-bed flow condition. The influence of the porosity (P) of both front and rear piles in the tandem configuration (P= 0–38.5 %) and the gap ratios (G/D= 2–12) are quantified based on the measurement of the development of the local scour, time scale, three-dimensional scour profiles and the scour characteristics were analysed. Three regimes are identified regarding on the porosity distributions of the front and rear pile. The distinct features were found at the porosity of the front was small than its counterpart of the rear. The global scour can be recognized atG/D< 4. The dimensions of the scour hole for the rear pile decrease first as a trade-off is observed between the sediment deposit landed around the rear pile and its weak erosion. A critical gap ratio, at which the minimum scour dimensions were observed is strongly depend on the difference of the porosity between the front and rear piles.