加筋挡土墙地震动力响应规律及地震动参数影响研究

Study on the Seismic Dynamic Response Law of Reinforced Soil Retaining Wall and the Effect of Strong Ground Motion Parameters on Its Seismic Response

建立加筋挡土墙数值分析模型,研究在地震作用下加筋挡土墙的动力响应规律,以及地震动参数对加筋挡土墙动力响应的影响。结果表明在地震力作用下,加筋土体抵抗变形的能力高于纯土体,加筋土体对地震波低频部分的放大作用小于纯土体,而对高频部分的滤波作用优于纯土体。墙体加速度峰值放大系数随输入地震波加速度振幅、频率的增加而减小,持时对加速度峰值响应的影响不大;挡墙位移随振幅、持时的增加而显著增大,随频率的增大而减小,其研究结果有助于进一步揭示加筋挡土墙在地震作用下的失稳机制。

A numerical simulation model of reinforced soil retaining wall was established. The dynamic response law of reinforced soil retaining wall and the effect of strong ground motion parameters on its seismic response in earthquake were researched. The results showed that the anti - deformation properties of reinforced soil and its filtering effect on seismic waves with higher frequency were better than pure soil, but the amplification effect of reinforced soil on seismic waves with lower frequency was lower than that of pure soil. It was indicated that the amplification coefficient of peak acceleration of soil retaining wall decreased with the increase of amplitudes and frequencies of earthquakes ,while peak acceleration response was less affected by the duration of seismic wave. It was also indicated that the maximum displacement of reinforced soil retaining wall increased with the increase of amplitudes and duration of seismic wave, while decreased with the increase of frequency of seismic wave. The conclusions were helpful to further research on the instability mechanism of reinforced soil retaining wall in earthquakes.