循环载荷作用下边坡临空面质点运动轨迹特征探讨

    NUMERICAL STUDY OF PARTICLE MOTION AT FREE SURFACE OF SLOPES UNDER CYCLIC LOADING

    • 摘要: 循环荷载作用下边坡岩土体容易产生变形破坏,边坡各部位的破坏方式存在不同。基于数值模拟技术,建立2个不同高度的边坡模型,分析了坡肩处质点分别在10Hz垂向压缩和水平剪切循环荷载作用下的运动轨迹特征,并依据物体受力运动与变形之间的关系确定了坡肩潜在的破坏方式。研究表明: 2种加载方式下坡肩质点的运动轨迹均呈椭圆形,加载方式和坡高对坡肩质点的运动轨迹及边坡的潜在破坏方式都有一定影响。低边坡坡肩质点在垂向压缩循环荷载下主要表现为垂向振动,该处岩体发生拉破坏的可能性大; 在水平剪切循环作用下该质点主要表现为水平向振动,坡肩岩体发生剪破坏的可能性大。对高边坡而言,坡肩质点水平向与垂直向的振动幅值之差较低边坡坡肩质点的明显小,说明高边坡坡肩在这2种循环荷载最有可能产生拉剪破坏。

       

      Abstract: Under cyclic loading,a slope can be easily deformed and damaged.The failure mode of each part of the slope is different.Based on the technology of numerical simulation,two slopes with different heights are established.And the particle motion at slope shoulders of the two slopes are analyzed under 10 Hz cyclic vertical compressive load and horizontal shear load,respectively.According to the relation between force and deformation,the potential failure mode of slope shoulder is reveal.The results show that: under cyclic vertical compressive loading and horizontal shear loading,the trail of slope shoulder' particle motion is oval shape.However,the loading pattern and slope height affect the trail of the particle motion.Under vertical compressive load,the particle at lower slope shoulder is experiencing vertical vibration seriously.So the lower slope shoulder is more easily to surfer tension cut-off.Reversely,the particle at lower slope shoulder is experiencing horizontal vibration significantly under horizontal shear load,which show the lower slope shoulder is more easily subject to shear failure.Comparing with the lower slope condition,the vertical and horizontal amplitude of vibration of the particle at the higher slope shoulder under both vertical and horizontal load are close to each other,which show the shoulder of higher slope will be tensile-shear complex failure.

       

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