摘要
以乌鲁木齐市轨道交通4号线天然司车站和七道湾车站场地为例,在不同频谱特性的人工地震动输入下,用等效线性化技术考虑土动力非线性特性,计算地表水平向场地地震反应,从计算基底深度的变化出发,研究低速层对地表水平向加速度峰值和加速度反应谱特征周期的影响。结果表明:(1)低速层对地表加速度中低频成分的影响较大,出现波谷和波峰;(2)低速层起到减小地表加速度峰值的作用。随输入强度的增大,地表加速度峰值下降幅度变大;(3)低速层对加速度反应谱特征周期的取值有很大影响,即对特征周期值有放大作用。随输入强度的增大,特征周期值放大的幅度变大。
Taking the Tianransi station and the Qidaowan station site conditions of Urumqi Subway Line 4 as examples,the seismic response of the ground surface is calculated by using the equivalent linearization technique considering the nonlinear dynamic characteristics of soil under the input of artificial seismic ground motions with different spectral characteristics.The effects of low velocity layer on the horizontal peak acceleration and the characteristic period of acceleration response spectrum are studied.The results show that:(1)the low-velocity layer has a great influence on the low-frequency components of the surface acceleration,and the troughs and crests appear.(2)The low-velocity layer plays a role in reducing the surface acceleration.(3)The low-velocity layer has a great influence on the value of the characteristic period of the acceleration response spectrum,that is,it amplifies the characteristic period value.As the input intensity increases,the magnification of the characteristic period value becomes larger.
作者
阿布都瓦里斯·阿布都瓦衣提
刘志坚
Abuduwalisi Abuduwayti;LIU Zhi-jian(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)
出处
《内陆地震》
2020年第2期139-146,共8页
Inland Earthquake
基金
新疆地震科学基金(201808)。
关键词
基底深度
低速层
加速度峰值
特征周期
Substrate depth
Low-velocity layer
Peak acceleration
Characteristic periods
