长期循环荷载下植生河岸护坡稳定性分析

Analysis on Stability of Vegetation Slope Protection for Bank under Long-term Cyclic load

以植生沥青混合料河岸护坡工程为对象,采用室内模型试验,分析了植生河岸护坡动力承载力特性、变形特性和护坡内动态土压力分布,揭示了循环荷载作用下河岸护坡的动力破坏机制。研究结果表明:随振次的增加,竖向累积沉降急剧增大,护坡内部土体发生整体滑移;坡顶位置处侧向变形较坡中和坡脚位置处稍大,加载板正下方测点土压力峰值与均值明显大于其两边测点;植生拉结作用对竖向位移的发展起抑制作用。

Take the vegetation asphalt mixture slope protection project as target,an indoor model test is carried out to analyze the dynamic bearing capacity characteristic,deformation characteristic and pressure distribution of dynamic soil of the vegetation slope protection,which reveal the dynamic failure mechanism of the slope protection under the cyclic load.The result shows that:with increase of vibration frequency,the cumulative vertical settlement increases sharply,and the soil body in the slope protection slides wholly.The lateral deformation at the top of the slope is slightly larger than that of the middle and bottom of slope.The peak value and the mean value of the soil pressure at the test point right under the loading plate are obviously larger than that of the two sides of test points of the slope.The ties of vegetation inhibit the development of vertical displacement.