单面均质岩体边坡地震动放大效应的数值模拟研究

发布时间：2018-06-26 22:25

本文选题：边坡工程 + 单面边坡　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：边坡地震动放大效应的研究是开展边坡抗震设计的基础。提出基于白噪声的地震动荷载反演方法,通过动力学计算和频谱分析发现边坡具有宽频带反应体系的特性,单面均质边坡在坡肩处的放大系数最大且通常不超过2.0。较之于考虑行波效应的地震动输入方式,采用时空一致地震动输入的计算结果偏保守。地震波频谱特性对放大系数影响的研究表明,抗震设计中应依据边坡所在场地的设计地震分组确定放大系数。通过引入一个与周期同量纲的参量来综合反映坡高、坡度和岩体波速对坡肩放大系数的影响,并针对Taft波和El Centro波分别计算获得了坡肩水平向放大系数的谱曲线。放大系数的包络分析表明边坡表面的放大系数通常不超过1.85。研究结果可为均质岩体边坡的抗震设计提供理论依据与技术支持。
[Abstract]:The study of the amplification effect of slope ground motion is the foundation of slope seismic design. A method for inversion of ground motion load based on white noise is proposed. By dynamic calculation and spectrum analysis, it is found that the slope has the characteristics of wide band response system, and the magnification factor of a single homogeneous slope at the shoulder of the slope is the largest and usually does not exceed 2.0. Compared with the ground motion input mode considering the traveling wave effect, the calculation results of the spatio-temporal consistent seismic input are conservative. The study of the effect of seismic wave spectrum characteristics on magnification factor shows that the magnification factor should be determined according to the seismic grouping of the site of slope in seismic design. By introducing a parameter of the same dimension as the period to reflect the influence of slope height, slope and rock mass wave velocity on the slope shoulder magnification factor, the spectral curves of slope shoulder horizontal magnification factor are calculated for Taft wave and El Centro wave, respectively. The envelope analysis of the magnification factor shows that the magnification factor of the slope surface is usually less than 1.85. The results can provide theoretical basis and technical support for seismic design of homogeneous rock slope.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金资助项目(51174190,51025935,51439008)~~
【分类号】：TU45

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