现浇型生态混凝土护岸抗水力冲刷性能试验研究

目前,现浇型生态混凝土等新型的生态型护坡逐渐取代传统混凝土护坡,得到了越来越广泛的应用。但作为一种新兴的护坡方式,现浇型生态混凝土抗水力冲刷性能缺少实验数据的支撑。根据实际工程中的应用情况,制作了三种不同厚度的现浇生态混凝土样本,采用专用的实验仪器研究其在高速明渠流作用下的抗水力冲刷性能。结果表明:边界效应对生态混凝土的抗冲刷性能影响很大。在处理好边界效应的情况下,现浇型生态混凝土护岸在高速明渠流的作用下,水力淘刷现象不明显,下覆土体表面基本保存平整,土体高程下降微小(0.1 mm)。因此,现浇型生态混凝土护岸有着很好的抵抗高速水流(本研究最大流速达到6.11 m/s)冲刷的能力,在水利护岸工程中可以代替传统护岸和预制生态混凝土护岸进行应用。

Experimental study on hydraulic erosion resistance of cast-in-place eco-concrete revetment

At present, the conventional concrete revetment is continuously replaced by the new types of eco-revetments, such as cast-in-place eco-concrete revetment, etc., which are more and more widely applied. However, as a kind of newly applied mode for bank protection, there is no sufficient experimental data for supporting the hydraulic erosion resistance of the cast-in-place eco-concrete. In accordance with its application to actual project, three samples of the cast-in-place concrete with different thicknesses are made, and then their hydraulic erosion resistances under the effect of high velocity open-channel flow are studied with the special experiment apparatus. The result shows that the erosion resistance of the eco-concrete is greatly impacted by the boundary effects concerned. If the boundary effects are well-treated, the phenomenon of hydraulic erosion on the cast-in-place eco-concrete revetment is not to be so significant, while the surface of the underlying soil mass is to remain smooth with only a little declination ( 0. 1 mm) of the soil mass. Thus, the cast-in-place eco-concrete revetment has a better ability to resist the erosion from high velocity flow ( the maximum flow velocity adopted in this study reaches to 6. 11 m/s) and then can be applied to the bank protection project for water conservancy works for replacing the conventional revetment and precast eco-concrete revetment.