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作 者:孙雪晨 常晁瑜 薄景山 冯凡 田华俊 代天宇 Sun Xuechen;Chang Chaoyu;Bo Jingshan;Feng Fan;Tian Huajun;Dai Tianyu(School of Geological Engineering,Institute of Disaster Prevention,Hebei Sanhe 065201,China;Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment,Hebei Sanhe 065201,China)
机构地区:[1]防灾科技学院地质工程学院,河北三河065201 [2]河北省地震灾害防御与风险评价重点实验室,河北三河065201
出 处:《地震学报》2024年第6期1024-1033,共10页Acta Seismologica Sinica
基 金:国家自然科学基金项目(U1939209);河北省高等学校科学研究计划(QN2021309);河北省大中学生科技创新能力培育专项(22E50467D)共同资助。
摘 要:基于西吉、海原和固原的野外调查资料建立了典型斜坡场地概化数值模型,通过选择合理动力人工边界,探究地震动频谱特性对黄土斜坡地震响应的影响。结果表明:①斜坡加速度受地震动输入频率影响较大,在输入不同频率地震动时,不同监测点加速度峰值放大系数呈现不同变化趋势,同时,速度和位移受地震动输入频率影响较大,各监测点的峰值速度和峰值位移随频率的变化趋势一致;②低频是诱发斜坡失稳的关键频段,高频振动下斜坡不易发生失稳破坏,斜坡对低频地震波存在放大作用,对高频地震波具有一定的“滤波”作用;③随着高程的增加,斜坡的运动位移增大,且地震动输入频率越低,这种增大效果越明显。Due to its unique macropores and weak cementation structure,loess shows significant water sensitivity and dynamic vulnerability compared with other soil types.In China,the distribution of loess is very extensive,especially in the Loess Plateau,where the crustal activity is frequent.Active tectonics and frequent strong earthquakes can easily lead to landslides and other disasters,resulting in significant casualties and economic losses.Studies have shown that ground motions with different spectra have a significant impact on slope stability.Identifying the main frequency bands that cause slope instability is crucial for assessing the stability of loess slopes and helping to effectively prevent disasters such as landslides.Based on the field survey data of loess topography and geological conditions in Xiji-Haiyuan-Guyuan area,this paper constructs a typical generalized numerical model of slope site.The model is divided into three layers:basement,mudstone and loess.Each layer of soil is regarded as isotropic and simulated by Mohr-Coulomb material model.Through a large number of geotechnical experimental data,the parameters of different soil layers in the model are accurately assigned.On this basis,the appropriate dynamic artificial boundary is selected,and the actual record of Kobe seismic wave is used as the original seismic data.By screening different frequency bands(0−2,2−4,4−6,6−8,8−10 Hz),the filtered acceleration time history amplitude is adjusted to make the five acceleration peaks consistent as input waves.At the same time,according to the monitoring requirements,multiple sets of monitoring points are set up,and the influence of ground motion spectrum characteristics on the seismic response of loess slope is explored by observing the maximum velocity,maximum acceleration and maximum displacement time history data curves of each monitoring point.The results show that:①The slope acceleration is significantly affected by the input frequency of ground motion,and the peak acceleration amplification coe
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