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针对拟静力方法是否适用于水平设计加速度值较大条件下的地震边坡稳定性分析问题,选取两个典型均质土坡,分别采用极限平衡毕晓普方法与FLAC 2D强度折减方法进行了不同水平设计加速度条件下,地震边坡抗滑稳定性安全系数以及临界滑动面的变化趋势,研究结果发现:对于粘聚力较小的均质土坡而言,无论是极限平衡毕晓普法还是FLAC 2D强度折减法,静力条件下的临界滑动面较浅,随着水平设计加速度值的逐渐增大,地震边坡抗滑稳定安全系数逐渐减小,极限平衡毕晓普法得到临界滑动面基本保持不变,FLAC 2D强度折减法得到的剪应变云图逐渐变窄;对于粘聚力较大而摩擦角较小的均质土坡而言,静力条件下的临界滑动面较深,两种方法下,随着水平设计加速度的增加,抗滑稳定安全系数逐渐减小,临界滑动面逐渐加深,当水平设计加速度值增加到一定程度后,拟静力方法不再适用于地震边坡稳定分析。
Aiming at the stability analysis of seismic slope under the condition of large horizontal design acceleration, aiming at the problem that quasi-static method is suitable for seismic slope stability analysis, two typical homogeneous soil slopes are selected, which are respectively different from FLAC 2D strength reduction method Under the condition of horizontal design acceleration, the safety factor of anti-sliding stability of seismic slope and the trend of critical slip surface, the results show that for the homogeneous cohesion with small homogeneous cohesion, whether it is the limit equilibrium Bishop method or FLAC 2D strength reduction method, the critical slip surface is shallow under static conditions. As the horizontal design acceleration value increases, the safety factor of anti-slide stability of seismic slope gradually decreases. The critical balance Bishop method can basically maintain the critical slip surface Constant, the shear strain cloud obtained by the FLAC 2D strength reduction method becomes narrower. For the homogeneous soil slopes with larger cohesion and smaller friction angle, the critical slip surface under static conditions is deeper. Two methods , Along with the increase of horizontal design acceleration, the safety factor of anti-sliding stability decreases gradually and the critical sliding surface gradually deepens. When the horizontal design acceleration increases to a certain extent, the quasi-static method It is no longer suitable for seismic slope stability analysis.