摘要
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。
As to the research of the slope stability with steep inclined seam and horizontal fracture under different earthquake accelerations and times, effects of treatment, the earthquake process and control schemes on above mentioned problems are simulated by PFC3 D. The discontinuity and continuity of rock mass structure forms are simulated with the JSET and Bonds in PFC3 D. Using PFC3 D for continuous and discontinuous rock mass simulations, the internal failure processes of slope are simulated with the accelerations of 0.2g, 0.3g, 0.4g and 0.5g and times of 8s, 14 s, 20 s and balance. According to the simulation results, a slope reinforcement scheme is presented, including reinforce the slope angle and strengthen body joined in the slope. The treatment scheme is simulated under the same conditions. Results show that before treatment scheme, in a=0.2g, a=0.3g(before 14s),the slope is stable under the condition of the earthquake. After treatment scheme, a=0.2g, 0.3g and a=0.4g(before 14s), the slope is stable. The slope fault zone is treated by constraining the slope angle and slope. But the inverse slope fault zone unable to be suppressed.
出处
《应用力学学报》
CAS
CSCD
北大核心
2016年第2期339-344,378-379,共6页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51274110
51474121
U1361211)
关键词
矿业工程
露天矿边坡
复杂构造
颗粒流
地震灾害
治理方案
模拟与分析
mining engineering
open-pit coal mine slope
complex structures
PFC
earthquake disasters
treatment plan
simulation and analysis
