生态砌块式加筋挡墙动态失稳研究

Erosion-resisting Characteristic of Block Ecological Geordies-reinforced Retaining Walls

建立室内生态砌块式挡墙冲刷试验模型,从水流流速入手,模拟挡墙在水流冲刷作用下的淘刷过程,探求挡墙的淘刷机理,试验表明:当水流流速超过1.2m/s时,墙后土体从水面波动处生态孔被淘出,逐渐淘刷成一贯穿通道,并不断往墙背方向楔入。利用有限元法建立挡墙模型,进行淘刷坑不断增大情况下的稳定性分析,得到墙面板位移、墙后土体塑性应变、土工格栅应变的发展变化,揭示生态砌块式加筋挡墙的动态失稳机理。

Laboratory scouring model of block ecological retaining wall was built, simulated scouring process of retaining wall in different flow velocity, explored the scouring mechanism. The test shows that the soil behind retaining wall was scoured from the ecological hole when the flow velocity was more than1.2m/s, and then forms a penetrated channel gradually. The distribution of horizontal displacement、plastic strain、gorged strain were calculated by using finite element method. The results are valuable to explore the dynamic instability mechanism for block ecological georgics-reinforced retaining walls.