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针对处于高烈度地震带地区的公路边坡,在进行稳定性分析时地震力是一个重要因素。汶川地震后对地震波传播有了新的认识,即垂直加速度和水平加速度几乎一样大小。针对强风化层花岗岩边坡稳定性的研究,结合动力有限元方法,运用动力时程法分析水平和垂直地震动荷载条件对边坡稳定性的影响。并与具体的工程实例相结合,通过计算结果得到的应力、位移等变化趋势,确定边坡在地震力的作用下的潜在不稳定区域。为了保证坡体上桥桩的稳定,得出边坡受到地震动荷载作用后对桥桩的影响,针对边坡的失稳提出相应的支护措施建议。
For the highway slopes in the high seismicity zone, the seismic force is an important factor in the stability analysis. After the Wenchuan earthquake, there was a new understanding of seismic wave propagation, that is, vertical acceleration and horizontal acceleration are almost the same size. In view of the stability of the granite slope with strong weathering beds and the dynamic finite element method, the dynamic time-history method is used to analyze the influence of horizontal and vertical ground motions on the slope stability. Combined with the specific engineering examples, the potential instability of the slope under the action of the earthquake force is determined by the trend of stress, displacement and other trends obtained by the calculation. In order to ensure the stability of the bridge piles on the slope, the influence of the seismic load on the bridge piles after the earthquake is obtained, and the corresponding support measures are proposed according to the slope instability.