圆环联锁型生态护岸结构稳定性试验研究

Stability test of ring interlocking ecological revetment structure

现有生态护岸以稳定性为主,考虑生态性较少。为改善岸坡的生态性,提出一种圆环联锁型生态护岸结构。为探究该生态护岸结构在建设初期(无植被时)的稳定性及防护效果,通过动床实验对比不同防护措施下岸坡的稳定性,并研究流速对护岸结构稳定性及防护效果的影响。研究结果表明:1)圆环联锁型生态护岸结构可有效减少岸坡冲刷面积和冲刷深度,增强岸坡稳定性;2)其失稳形式有2种,分别为因坡脚变形而下滑失稳和因岸坡淘刷而下陷失稳;3)其冲刷面积和最大冲刷深度随流速增大而增大,二者的增率随流速增加而减小。

The existing ecological revetment focuses mainly on stability and less on ecology.To improve the ecology of the bank slope,we propose a ring interlocking ecological revetment structure.To investigate the stability and protective effect of this structure at the initial construction stage(without vegetation),we compare the bank slope stability under different protective measures and study the effect of flow velocity on the stability and protective effect of the revetment structure by dynamic bed experiments.The results are as follows.1)The proposed structure can reduce the scour area and depth of the bank slope and enhance the stability of the bank slope.2)There are two instability forms,including slump instability due to slope footing deformation and sag instability due to bank slope hollowing.3)The scour area and maximum scour depth increase with rising flow velocity,and their growth rate decreases with increasing flow velocity.