基于黏弹性人工边界条件的岩质边坡动力反应分析  

Dynamic Response Analysis of Rock Slope Based on Viscoelastic Artificial Boundary Condition

作　　者：景鹏旭 尹超 门丽君 许杰夫 杨清逸 JING Pengxu;YIN Chao;MEN Lijun;XU Jiefu;YANG Qingyi(National Earthquake Response Support Serice,Beijing 100049,China;Bejing Jiaotong University,Beijing 100055,China;Shanxi Institute of Technology,Yangquan,Shanxi 045000,China;Beijing Tsinghua Holdings Human Sttlements Lighting Research Institute Co.,td,Beijing 100089,China)

机构地区：[1]中国地震应急搜救中心,北京100049 [2]北京交通大学,北京100055 [3]山西工程技术学院,山西阳泉045000 [4]北京清控人居光电研究院有限公司,北京100089

出　　处：《水利与建筑工程学报》2021年第1期190-194,共5页Journal of Water Resources and Architectural Engineering

基　　金：中国地震应急搜救中心青年基金(SJ1901)。

摘　　要：基于数值分析方法,以二维岩质边坡为例,通过布置在边界处的弹簧和阻尼器构成黏弹性人工边界条件,探讨边坡尺寸、形状以及地震波的类型对放大效应的影响。结果表明地震波频率和坡角是地震响应的决定性因素,坡高对于边坡特征点(坡脚、坡顶)的变化敏感性较低。结论如下:对于同一地震波频率,不同坡高对于地震放大效应的影响较小,差别仅在于边坡越高,坡脚距离坡顶的距离越长,这部分的动力响应越明显;对于同一边坡角度,随着入射地震波的频率越高,坡面的放大系数逐渐增加;对于同一边坡高度,随着边坡的角度变陡,坡面的放大系数逐渐增加。综上所述,在岩质边坡抗震设计时应考虑放大效应的影响。Based on the numerical analysis method,this paper takes a two-dimensional rock slope as an example,and discusses the influences of the size and shape of the slope and the type of seismic wave on the amplification effect by forming a viscoelastic artificial boundary condition with springs and dampers arranged at the boundary.The results show that seismic wave frequency and slope angle are the decisive factors for seismic response,and slope height is less sensitive to changes in slope characteristic points(slope foot,slope top).The conclusions are as follows.For the same seismic wave frequency,different slope heights have less impact on the seismic amplification effect.The only difference is that the higher the slope,the longer the distance between the slope toe and the slope top,the more obvious the dynamic response of this part.For the same slope angle,as the frequency of the incident seismic wave is higher,the slope amplification factor gradually increases.For the same slope height,as the slope angle becomes steeper,the slope amplification factor gradually increases.In summary,the impacts of the amplification effect should be considered in the seismic design of rock slopes.

关 键 词：岩质边坡 黏弹性边界人工边界 放大效应 频率 

分 类 号：TU443[建筑科学—岩土工程]