植被护坡水流冲刷稳定性试验研究

从植被护坡水流冲刷稳定性设计的角度出发,对紫羊茅草皮及早熟禾草皮分别从坡面流与有压流两个方面进行了水流冲刷稳定性试验。试验结果表明:坡面流间歇冲刷8次,瞬时流速达6.0 m/s,累积冲刷时间120 s,紫羊茅草皮可发生IV级的冲蚀破坏。早熟禾草皮在5.0 m/s的流速下,冲刷1 h后,其草皮层出现最高级别的破坏,测定其发生破坏时的床面剪应力为103.13 Pa,摩阻流速为0.32 m/s。

Experimental studies on stability of sod revetment under flow scouring

Experimental studies on stability of sod revetment such as sod cover of red fescue and blue grass, in terms of surface runoff and pressure flow are carried out, from the angle of stability for designing of sod revetment under flow scouring. The result shows that scouring damage of red fescue at grade IV may happen when the scouring interval of slope flow is 8 times, instantaneous velocity reaches 6.0 m/s and cumulative scouring time is 120 s. However, even severe damage may occur to revetment of blue grass under a flow rate of 5.0 m/s and after 1 h of scouring, and the shear stress of revetment is 103.13 Pa and friction velocity reaches 0.32 m/s.