基底宽度对石笼结构水毁影响分析

石笼在山区桥梁建设中应用广泛但水毁频发。为研究石笼结构具体的水毁模式,通过模型实验加数值模拟来对河流泥沙的冲刷形态和水流流场进行分析。结果表明:较于双排网箱,三排网箱具有良好的耐冲性能。至失稳时间,三排基础网箱桥墩最大冲刷深度超出双排基础网箱桥墩7.1%,最小冲刷深度超出双排网箱13%;网箱的主要变化是产生了一定范围的沉降,这些沉降点集中于垂直水流方向的侧倾和沿Z轴方向,其沿水流方向(X轴)产生的位移很小。

Impact Analysis of Base Width on Flood Damage of the Gabion Structure

The gabion is widely used in the construction of bridges in the mountain area but the flood damage happen frequently. In order to study the specific flood damage patterns of gabion structures, the scour shape and flow field of river sediment are analyzed by model experiment and numerical simulation. The results show that compared with double-row net cages, the three-row net cages have good impact resistance. During the destabilization time, the maximum scouring depth of the three-row foundation net cage pier exceeds 7. 1% of the double-row foundation net cage pier, and the minimum scouring depth exceeds 13% of the double-row net cage. The main change in net cages is the generation of a range of settlements. These settlements are centered on the roll in the direction of the vertical flow and along the Z-axis, with very little displacement in the direction of the water flow(X-axis).