摘要
从我国不同地区地震安全性评价报告中选出3个代表Ⅱ、Ⅲ、Ⅳ类场地的钻孔,利用新一代土层地震反应分析方法和程序SOILQUAKE,计算这些钻孔在3种输入地震动强度下的地表峰值加速度,研究不同覆盖土层厚度对地表峰值加速度的影响。结果表明:3种场地在相同覆盖土层厚度下,输入地震动强度越大,PGA越大,在覆盖土层厚度约30~40m时PGA达到最大值。放大倍数与输入地震动强度反相关,覆盖土层厚度为25~30m时,放大倍数在3种地震动强度下均达到最大值,且其随着地震动强度增加而增加,增加幅度则随着强度的增加而减少。
Firstly,we selected three boreholes representing sites of classⅡ,ⅢandⅣrespectively from the seismic safety evaluation reports of different regions in China.Then,by employing the new method put forward by an academic team led by Yuan Xiaoming for earthquake response analysis of soil layers and the software of SOILQUAKE,we calculated the peak ground acceleration of these boreholes under three seismic motion inputs with different intensities,and studied the effect of different overburden thickness on the peak ground acceleration.The result shows that with identical overburden thickness,the greater the intensity of seismic motion input,the greater the PGA of all three sites,with the PGA reaching the highest level when the thickness of overburden is about 30-40m.The magnification,inversely proportional to the intensity of seismic motion input,reaches the highest level under all the three different intensities of seismic motion when the thickness of overburden is 25-30m.As the seismic motion intensity increases,the magnification increases while its increase amplitude decreases.
作者
杨明杰
郭明珠
YANG Mingjie;GUO Mingzhu(The College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100022,China)
出处
《防灾科技学院学报》
2019年第4期30-34,共5页
Journal of Institute of Disaster Prevention
基金
北京工业大学研究生科技基金(ykj-2017-00551)
关键词
土层地震反应
地震动输入
覆盖层
地表峰值加速度
ground seismic response
seismic motion input
overburden
peak ground acceleration
作者简介
杨明杰(1995-),男,硕士,主要从事工程抗震方面的研究;通讯作者:郭明珠(1964-),男,博士,教授,主要从事工程抗震方面的研究。
