河流崩岸防治的模袋排帘法及模型试验

为解决冲刷引起的崩岸问题,结合土力学和水力学两方面的原理,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。

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

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 cover the entire slope,so the fabric strip-curtains are easy to construct and inexpensive.