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基于希尔伯特–黄变换和边际谱理论,进行了含软弱夹层顺层岩质边坡的大型振动台试验,并利用试验结果对含软弱夹层顺层岩质边坡动力破坏模式的能量判识方法进行了研究,结果表明:边际谱峰值和特征频率的变化能清晰地表征边坡内部的震害损伤发展过程;地震作用下含软弱夹层顺层岩质边坡的损伤首先出现在坡肩位置,随着地震动强度的增大,震害损伤逐渐向低高程发展,最终边坡在坡体中上部相对高度0.56处沿软弱夹层顺层剪出,试验中坡面的位移监测结果表明坡体中上部位移出现陡增时刻晚于坡肩,边际谱分析结果与位移监测结果吻合较好;坡面附近的震害程度强于坡体内部;边坡中下部特征频率发生突变,表明坡体中下部为边坡动力响应的不连续带;含软弱夹层顺层岩质边坡的破坏形式主要表现为边坡后缘垂直的拉裂破坏和沿边坡中上部相对高度0.56处软弱夹层的剪切滑出破坏,边坡的破坏模式为拉裂-滑移-崩落式。本文提出的能量判识方法对识别边坡的破坏模式具有一定的指导意义。
Based on the Hilbert-Huang transform and the marginal spectrum theory, a large-scale shaking table test of bedding rock slope with weak intercalation was carried out. The test results were used to determine the energy of dynamic failure mode of bedding rock slope with weak intercalation The results show that the variation of the marginal peak and the characteristic frequency can clearly characterize the process of earthquake damage damage inside the slope. The damage of the rock slope along the fault with the weak interlayer under the earthquake first appears on the shoulder Location, with the increase of ground motion intensity, the damage of earthquake damage gradually develops to low elevation. Finally, the slope slopes along the weak interlayer at a depth of 0.56 at the upper part of the slope, and the displacement monitoring results show that slope The moment of sharp increase in the upper part of the body appears later than the shoulder, and the marginal spectrum analysis results are in good agreement with the displacement monitoring results. The degree of seismic damage near the slope is stronger than that in the slope, and the characteristic frequency of the mid- The middle and lower parts are the discontinuous zones of dynamic response of the slope. The failure modes of the bedding rock slope with weak interbed are mainly the vertical tensile failure of the rear edge of the slope and the 0.56-point softness along the middle and upper part of the slope Shear slip of the weak interlayer is destroyed, and the failure mode of the slope is pull-slip-slip type. The energy identification method proposed in this paper is of guiding significance for identifying the failure modes of slopes.