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为研究不同地震加速度和时间下,急倾斜且具有水平裂隙发育边坡的破坏特点及其治理方案的效果,使用PFC3D对地震过程及治理方案进行模拟。针对连续和非连续岩体模拟的特点,利用PFC3D模拟了加速度a分别为0.2g、0.3g、0.4g、0.5g,时间分别在8s、14s、20s内及稳定时边坡内部的破坏过程。根据模拟结果提出了一套边坡治理方案,包括:加固坡角和向坡面加钢筋并注浆形成增强体,并在相同工况下进行了模拟。结果表明:未治理震灾前,在a=0.2g、a=0.3g(14s以前)的地震工况下边坡是稳定的;根据方案治理后,a=0.2g,0.3g,0.4g(14s以前)时边坡是稳定的。本文还发现顺坡破碎带和逆坡破碎带的现象。对坡角和坡面进行约束可治理顺坡破碎带。但逆坡破碎带是无法抑制的。
In order to study the failure characteristics of steep slope with horizontal cracks and development under different earthquake accelerations and time, the PFC3D method is used to simulate the earthquake process and treatment plan. Aiming at the characteristics of continuous and discontinuous rock mass simulation, the failure process of the slope is simulated by PFC3D with the acceleration a of 0.2g, 0.3g, 0.4g and 0.5g respectively in 8s, 14s, 20s and stable. Based on the simulation results, a set of slope control schemes are proposed, which include strengthening the slope angle and adding reinforcement to the slope and grouting to form reinforcements, and simulating under the same conditions. The results show that the slope is stable under the earthquake conditions of a = 0.2g and a = 0.3g (before 14s) before the uncontrolled earthquake; according to the scheme, a = 0.2g, 0.3g, 0.4g (14s Before) the slope is stable. This article also found that the phenomenon of the slope along the slope and broken belt. Constraints on slope angle and slope can be used to treat the belt along the slope. But the reverse slope broken belt can not be suppressed.