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运用有限差分软件 FLAC3D, 建立了呷爬滑坡体三维模型, 分别施加 1 倍和 3 倍 El2Centr o 地震波。计算结果表明, 1倍地震波作用下会发生一定的永久位移, 但不会滑动失稳; 3 倍地震波作用下将发生滑动失稳。进一步发现边坡在 1倍和 3倍地震波激励下的变形滑移特征不同, 第一种情况属于累积效应阶段, 变形主要集中于滑体ó , 第二种情况属于触发效应阶段, 滑体 的滑动变形同样剧烈。文中从滑坡体的组成物质和材料参数、滑动区域的地形因素和滑动区域的动力响应三方面进行了分析。运用 Newmark 有限滑动位移法, 基于滑体 和滑体ó 的加速度响应时程, 计算了两者的永久位移, 结果与数值计算吻合良好。表明滑体ó 处的动力响应会产生更大的永久位移, 从而验证了数值计算的结果。同时, 基于结构动力响应而计算得到的永久位移也可以作为衡量地震作用对该处结构变形影响的指标, 从而估计地震对局部结构的破坏作用。
By using finite difference software FLAC3D, a three-dimensional model of 呷 climb landslide was established, and seismic waves of 1 and 3 times El 2 Centr o were applied respectively. The calculation results show that some displacement will occur under the action of 1 times of seismic waves, but will not slip instability; sliding instability will occur under the effect of 3 times of seismic waves. It is further found that the characteristics of deformation and slippage of slopes under 1 and 3 times of seismic wave excitation are different. The first case belongs to the cumulative effect stage, and the deformation mainly concentrates on the slip body ó. The second case belongs to the triggering stage. Deformation equally fierce. The paper analyzes the material and material parameters of the landslide, the topography of the sliding area and the dynamic response of the sliding area. The Newmark finite sliding displacement method is used to calculate the permanent displacement based on the acceleration response time history of the sliding body and the sliding body ó. The results are in good agreement with the numerical calculation. It shows that the dynamic response at the sliding body ó will produce more permanent displacement, which verifies the numerical results. Meanwhile, the permanent displacement calculated based on the dynamic response of the structure can also be used as an index to measure the influence of the earthquake on the structural deformation there, so as to estimate the destructive effect of the earthquake on the local structure.