摘要
为了探究不同地下水位的场地条件下对吹砂填海场地动力响应的影响,以广西北部湾吹砂填海场地为研究对象,基于FLAC3D软件结合前期室内试验结果建立了场地模型,进行了数值模拟分析。在此研究中着重分析地下水位的变化对场地加速度放大系数、加速度反应谱和地震液化效应的影响,为减轻吹砂填海建设场地的震害程度提供参考依据。结果表明:随着地下水位埋深的增加,地表加速度放大系数呈现出逐渐减小的趋势,地震放大作用主要集中在短周期,卓越周期也在短周期处取得;随着地下水位埋深的减小,地震波高频成分被过滤,低频成分被放大,场地特征周期与卓越周期均有增大趋势;地下水位变化对吹填沙土层液化的产生和发展具有显著的影响,随着地下水位的上升,砂土表现出更强的液化效应,并且液化现象随着地震峰值加速度的增大逐渐沿土层深部发展。
In order to research the effect of different groundwater level on dynamic response of sand blown reclamation site,the sand-blown reclamation site in Beibu gulf of Guangxi is taken as the research object.The site model was established based on FLAC3D software combined with the results of previous laboratory tests of the research group,and the numerical simulation analysis is conducted.The effects of groundwater level change on site acceleration amplification factor,acceleration response spectrum and seismic liquefaction effect are analyzed,it provides a reference for reducing the seismic damage of the construction site.The results show that with the increase of the buried depth of groundwater level,the amplification coefficient of ground surface acceleration shows a decreasing trend,seismic amplification mainly focuses on the short period,and the transcendent period is also obtained at the short period;as the depth of the water table decreases,the high-frequency components of the seismic waves are filtered and the low-frequency components are amplified,both the characteristic period and the significant period of the site tend to increase;the variation of groundwater level has a significant influence on the generation and development of liquefaction in sand layer,as the groundwater level rises,the liquefaction effect of sand becomes stronger,moreover,liquefaction phenomenon develops gradually along the depth of soil layer with the increase of peak ground acceleration.
作者
覃钊
周东
刘涛
QIN Zhao;ZHOU Dong;LIU Tao(School of Civil and Architectural Engineering, Guangxi University, Nanning 530004, China;State Grid Shiyan Power Supply Company, Shiyan 442000, China)
出处
《世界地震工程》
CSCD
北大核心
2021年第1期198-206,共9页
World Earthquake Engineering
基金
国家自然科学基金项目(51378132)。
关键词
吹砂填海
地下水位
FLAC3D
地震液化
加速度放大系数
blowing sand reclamation
groundwater level
FLAC3D
seismic liquefaction
acceleration amplification factor
作者简介
覃钊(1996-),男,硕士生,主要从事环境岩土工程研究,E-mail:470891629@qq.com;通讯作者:周东(1962-),男,博士,教授,主要从事环境岩土工程研究,E-mail:zhd516@163.com。
