河流崩岸防治的模袋排帘法及模型试验

Fabric strip-curtain to prevent riverbank collapse and model flow tests

为解决冲刷引起的崩岸问题,结合土力学和水力学原理,提出了崩岸防治新措施——模袋排帘。通过室内水槽模型的含沙水流试验,测量泥沙冲淤地形变化,对所提出的模袋排帘的功效进行了直观的验证。结果表明:模袋排帘结构形式能有效调整近岸坡水流结构;透沙窗的设置,适应河流悬沙分布特征,实现了局部淤积、稳定岸坡地形的目的;大大降低岸坡上的排体覆盖率,经济成本得到削减,且施工方便。

Riverbank can be protected from erosion induced collapse by long tubular fabric strips with a floating curtain （strip-curtain） whose design is based on the principles of soil mechanics and hydraulics. Model flow tests with suspended sediment in a rectangle flume included hypsographic measurements of the plastic sand bed before and after the tests. The results show that the strip-curtains can effectively improve the flow structure near the riverbank. The size of sand-pass windows and the bottom currents with high suspended sediment density, are reasonable for the vertical distribution of suspended sediment in the river flow, so the bank slope can remain steady for a long time, even when local alluviums form. The coverage of the bank with this method is less than that with conventional measures which need to eover the entire slope, so the fabric strip-curtains are easy to construct and inexpensive.