【作者】 刘琨； 卢育霞； 李倩； 王平；

【Author】 LIU Kun 1, 2 , LU Yu-xia 1, 2 , LI Qian 1, 2 , WANG Ping 1, 2 1. Open Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 73000, China 2. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China

【机构】 中国地震局兰州地震研究所黄土地震工程开放实验室； 甘肃省岩土防灾工程技术研究中心；

【摘要】 构造典型软土夹层场地,以19条单频率脉冲和实际地震动记录作为输入,通过大量数值计算,讨论了软弱夹层土的埋深以及层厚对场地地震反应的影响.数值计算结果表明:对于给定的地震动输入,随着软弱夹层埋深的增加,地表加速度峰值和放大系数都有减小的趋势,当埋深超过一定值后,地表加速度放大系数小于1;软弱夹层厚度对地表加速度峰值的影响与软弱夹层所处位置及输入特性有关;脉冲输入与实际地震动输入相比,放大系数计算结果较为一致.更多还原

【Abstract】 Typical site profiles are constituted.In numerical analysis earthquake acceleration time-histories of single frequency pulse and actual ground motion record are regarded as input ground motion. The effect of depth and thickness of soft interlayer on earthquake ground motions of site are analyzed in this paper. It is shown by using numerical results obtained from many case studies that when the depth of soft interlayer is increased, the peak values of ground motion acceleration response and their amplification factor will be lessened; when the depth of soft interlayer exceeds a critical value, the amplification factor will be less than 1.0; The effect of thickness of soft interlayer on the earthquake response of deep soft sites is related to its depth and input characteristics; the results obtained are consistent when the input pulse and the actual ground motion.更多还原