地震作用下高边坡破坏的振动台试验

Shaking table test for high slope destruction under earthquake action

通过振动台模型试验,探讨含软弱夹层结构面、不同坡面形态的高边坡破坏特征及破坏机理,分析地质条件、地震荷载对边坡破坏变形的影响。试验结果表明:含泥化软弱夹层处易产生崩塌、滑移等失稳破坏现象。其中凹坡破坏以坡肩崩塌、变坡线上部整体滑移为主,破坏模式主要为坡顶形成的拉裂缝带动坡肩滑出坡体的影响;凸坡破坏以变坡线附近崩塌为主,破坏模式主要为变坡线处拉裂缝带动变坡线分层界面出现剪出崩塌;凹坡较凸坡不稳定,振动强度越大边坡变形破坏越显著;频率越接近模型的自振频率,边坡破坏越严重;持时与地震动输入的总能量密切相关。

Based on the shaking table model test, this paper discusses characteristic and failure mechanism of high slope of structures with weak interlayer surface and different slope forms. The influence of geological condi-tions and seismic loads on the failure deformation of the slop is also investigated. The experimental results show that the location of mud soft interlayer is easy to occur slip failure. The damage of convex slope mainly includes the collapse of slope shoulder and the integral slippage of the block above the variable slope line. Corresponding failure mechanism mainly is the top of the slope shoulder slipping off slope body. While the damage of convex slope mainly includes the collapse along the variable slope line and relative failure mechanism mainly is the vari-able slope line on tensile fissure driving the interface model of variable line cut-off collapse. The stability of con-vex slope is better than concave slope. The greater intensity of vibration results in more significant slope failure. The slope failure is more severe when the frequency is more close to that of the slope model. The duration is closely related with total energy of earthquake input.