黄土边坡自振特性影响因素分析  

Analysis of influence factors on natural vibration characteristics of loess slope

作　　者：孙纬宇 严松宏[1,3] 欧尔峰 宋旭辉[1,2] 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [2]兰州交通大学土木工程学院,甘肃兰州730070 [3]甘肃省轨道交通力学应用工程实验室,甘肃兰州730070

出　　处：《铁道科学与工程学报》2018年第1期64-70,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51268030);甘肃省科技计划资助项目(1310RJZA041)

摘　　要：边坡的动力特性是影响其动力响应的内在因素,对边坡的动力稳定性起着重要作用。运用ANSYS大型通用有限元软件对不同坡高和不同坡度的三维黄土边坡进行模态分析,探讨坡高和坡度对黄土边坡自振频率的影响。研究结果表明:各坡高和坡度条件下,黄土边坡的前10阶自振频率随频率阶数的增大而增大;坡度对各阶自振频率的影响相对较小,坡高对各阶自振频率的影响较大,随着坡度的增大,基频呈增大趋势,但增幅不大,同一坡高不同坡度时基频的相对变化率的最大值仅为6.80%;坡高对基频的影响较大,随着坡高的增大基频呈减小趋势,相同坡度不同坡高时基频相对变化率的范围为49.95%~50.02%。研究可为黄土边坡抗震设计时避免共振的发生提供一定的参考。The dynamic characteristics of the slope are the internal factors that affect the dynamic response and play an important role in the dynamic stability of the slope. In this paper, used ANSYS large-scale general finite element analysis software, conducted modal analysis for different slope height and gradient of loess slope, discussed the influence of height and gradient for loess slope natural vibration frequency. The results showed that： under the condition of slopes with different height and gradient, the first 10 order natural vibration frequency of loess slope increased as the frequency orders increased. The influence of slope gradient for every order natural vibration frequency is small relatively and slope height is large. With the increase of slope gradient, the fundamental frequency has an increase, but the increase is not large. Under the same slope gradient and different height, the maximum value of the relative change rate of fundamental frequency is only 6.80%. Slope height has a large influence for fundamental frequency, it will decrease with the slope height increase. The relative change rate of fundamental frequency is 49.95%~50.02% in the same slope gradient and different slope height. The research

关 键 词：黄土边坡 自振特性 模态分析 ANSYS 

分 类 号：TU444[建筑科学—岩土工程]