【摘要】 在动力有限元理论的基础上运用ANSYS软件对不同高度和坡度的岩质边坡进行了模态分析和地震加速度时程分析,发现了一些新的动力响应规律和现象。模态分析显示:随坡高的增加边坡的自振频率呈降低的趋势;而坡度变化对其影响则具有相反的规律。通过地震加速度时程分析发现:边坡的位移、速度、加速度反应三量具有相似的响应规律;随坡高的增加坡顶位移时程曲线振幅增大,但达到一定高度时(约200m)则变化较小,同时坡顶处的地震动响应相对于坡脚处出现了明显的滞后现象;坡度增加时坡顶位移呈线性增加的趋势;地震波的衰减效应与边坡对其的放大效应是同时存在的。研究结果对边坡的抗震设计具有一定的借鉴意义。更多还原

【Abstract】 On the basis of dynamics finite elements theory,rocky slopes with different height and gradiant are computed in the process of modol analysis and time-dependent analysis of seismic acceleration by ANSYS software.Some new dynamic response laws and phenomena are found through the research.The modol analysis shows that the natural vibration frequency of slope dropped as rising of slope height;while the changes of slope angle acts contrary to the natural vibration frequency.Time-dependent analysis of seismic acceleration also indicates that the displacement,speed and acceleration of slope response in the similar way.The amplitude of time-dependent curve of slope crest displacement evidently increase as the increasing of the slope height,nevertheless,the slope crest displacement changes slightly when the slope height reaches a certain degree(about 200 m),meanwhile,the ground motion responsed at the slope crest has a obvious hysteresis comparing to the slope foot.Furthermore,the slope crest displacement has a linear upward trend with the increasing in slope gradiant,besides,the attenuation effect of seismic wave and the amplification effect of slope exists at the same time.The results would have a great reference value to aseismic design of slope.更多还原