孙雪晨, 常晁瑜, 薄景山, 冯凡, 田华俊, 张东玲. 0: 地震动频谱对黄土斜坡稳定性的影响. 地震学报. DOI: 10.11939/jass.20230033
引用本文: 孙雪晨, 常晁瑜, 薄景山, 冯凡, 田华俊, 张东玲. 0: 地震动频谱对黄土斜坡稳定性的影响. 地震学报. DOI: 10.11939/jass.20230033
XueChen SUN, ChaoYu CHANG, JingShan BO, Fan FENG, HuaJun TIAN, DongLing ZHANG. 0: Influence of ground motion spectrum on the stability of loess slope. Acta Seismologica Sinica. DOI: 10.11939/jass.20230033
Citation: XueChen SUN, ChaoYu CHANG, JingShan BO, Fan FENG, HuaJun TIAN, DongLing ZHANG. 0: Influence of ground motion spectrum on the stability of loess slope. Acta Seismologica Sinica. DOI: 10.11939/jass.20230033

地震动频谱对黄土斜坡稳定性的影响

Influence of ground motion spectrum on the stability of loess slope

  • 摘要: 地震频谱作为地震动三要素之一,对黄土斜坡失稳有重要的影响.在野外调查和搜集研究地区资料的基础上,建立典型斜坡场地概化数值模型,选择合理动力人工边界,探究地震动频谱对黄土斜坡稳定性的影响.得到以下结论:(1)斜坡加速度受地震动输入频率影响较大,在不同频率地震动输入下,不同监测点加速度峰值放大系数曲线呈现不同变化趋势.同时,速度和位移受地震动输入频率影响较大,但不同频率下各监测点的速度、位移曲线趋势相同;(2)低频振动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,对高频地震波存在一定的“滤波”作用;(3)随高程增加,斜坡运动位移增大,且地震动输入频率越低,这种增大效果越明显.本项研究为黄土斜坡稳定性增强提供参考,对地震滑坡防灾减灾工作具有理论和现实指导意义.

     

    Abstract: Seismic spectrum, as one of the three elements of ground motion, has a significant influence on the instability of loess slopes. On the basis of field investigation and collection of research area data, a generalized numerical model of typical slope site is established, and a reasonable dynamic artificial boundary is selected to explore the influence of ground motion spectrum on the stability of loess slope. The following conclusions are obtained : (1) The slope acceleration is greatly affected by the input frequency of ground motion. Under different frequency ground motion input, the acceleration peak amplification coefficient curves of different monitoring points show different trends. At the same time, the velocity and displacement are greatly affected by the input frequency of ground motion, but the velocity and displacement curves of each monitoring point at different frequencies have the same trend; (2) Low frequency vibration is the key frequency band to induce slope instability, and the slope is not easy to fail under high frequency vibration. The slope has an amplification effect on low-frequency seismic waves and a certain ' filtering ' effect on high-frequency seismic waves; (3) With the increase of elevation, the displacement of slope motion increases, and the lower the input frequency of ground motion, the more obvious the increase effect. This study provides a reference for the enhancement of loess slope stability, and has theoretical and practical guiding significance for earthquake landslide disaster prevention and mitigation.

     

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