摘要
为研究露天矿边坡存在复杂断层弱面时,地震荷载对边坡岩体状态的影响,设置地震工况,并使用FLAC^(3D)对该边坡地震过程进行模拟,考虑到岩体受地震荷载作用的主要表现形式,确定使用岩体塑性区变化、位移和最大主应力3个指标表征岩体状态变化。地震设置为8Hz平行于水平面的正弦波,震级为3~9级,持续时间为3,6,9s,共形成21种工况,模拟在21种工况下,该边坡岩体状态的变化特征。结果表明,6级以下地震对边坡影响不大,塑性区受震级影响较大,位移受震级和时间影响较大,最大压主应力随震级和时间的增加而增大。塑性区主要在边坡上部,位移和拉主应力在边坡坡面,压主应力在坡内,地震荷载对边坡塑性区域、位移及最大主应力的影响和作用区域都不同。
In order to study the influence of seismic load on the state of rock mass in open-pit slope with complex fault weak surface,seismic conditions were set and FLAC^(3D) is used to simulate the seismic process of the slope.Considering the main forms of rock mass subjected to seismic load,three indexes of rock mass plastic zone change,displacement and maximum principal stress are determined to represent the change of rock mass state.The earthquake is set at 8 Hz parallel to the horizontal sine wave,the magnitude is 3~9,and the duration is 3,6,9 s.A total of 21 working conditions are formed,and the changing characteristics of the rock mass state of the slope are simulated under 21 working conditions.The results show that the earthquake below magnitude 6 has little effect on the slope,the plastic zone is greatly affected by the magnitude,the displacement is greatly affected by the magnitude and time,and the maximum compressive principal stress increases with the increase of the magnitude and time.The plastic zone is mainly in the upper part of the slope,the displacement and tension principal stress are in the side slope,the compressive principal stress is in the slope,and the seismic load has different effects on the plastic zone,displacement and maximum principal stress of the slope.
作者
崔铁军
李莎莎
CUI Tiejun;LI Shasha(School of Environmental and Chemical Engineering,Shenyang Ligong University;Liaoning Modern Safety Engineering Industry School,Shenyang Ligong University)
出处
《现代矿业》
2025年第4期132-138,共7页
Modern Mining
基金
国家自然科学基金资助项目(编号:52004120)。
关键词
矿山安全
露天矿
边坡岩体
地震荷载
模拟研究
mine safety
open-pit mine
slope rock mass
earthquake load
simulation study
