【摘要】 根据结构动力学理论,建立了边坡共振的力学模型。通过数值模拟的方法研究边坡在地震作用下的共振特点。数值分析结果表明:在水平地震作用下,地震波频率与边坡的第二阶固有频率一致时,才会发生共振。在模态分析时发现,边坡的第二阶固有频率所对应的振型为水平向振动。边坡发生共振时,越靠近坡面水平向位移越大,随坡高的增加,水平向位移也在增大,同时竖直向位移也有相同的变化规律。在坡面的一定区域内,两个方向的位移同时达到最大值,从而表现为一种向外的抛掷效应。边坡的这种共振特性与黄润秋教授在汶川地震现场调查所发现的坡面物质被抛出的现象十分相似。将共振概念引进到边坡工程的研究中,可为解释一些地震中特殊的滑坡现象提供新的理念,对于边坡工程的抗震设计具有重要参考价值。更多还原

【Abstract】 Based on structural dynamic theory,the resonance mechanical model is established.By utilizing numerical simulation method,the resonance characteristics of slope in earthquake are studied.Numerical results show that under the influence of horizontal seismic action,resonance will occur when the seismic wave frequency is identical to the second-order natural frequency of slope.In the model analysis,it is found that the second-order model of slope corresponds with horizontal vibration.When the resonance occurs in slope,horizontal displacement is increasing with the rising of height of slope,and the vertical displacement has the same rule as well.Within a certain region in the slope,the displacements in both directions are reached maximum at the same time.Thus it performs as a kind of thrown outward effects.The results are similar to the phenomenon that slope material is thrown out,which is investigated by Professor Huang Runqiu in the Wenchuan earthquake.Resonance study of slope effect can provide new ideas in explaining some of the special earthquake landslides,and has a significant effect on anti-earthquake design of slope.更多还原