摘要
为系统地研究地震动参数对地裂缝场地土体动力响应的影响规律,探究动力放大系数在地裂缝场地土体内部的分布规律,以西安地裂缝为研究对象,开展了地裂缝场地土体振动台物理模型试验和数值模拟分析。研究结果表明:加速度和Arias强度放大系数从模型土底部到顶部逐渐增大,地表放大系数远大于土体底部的;在单向或者多向地震作用下,地裂缝场地上、下盘有不同的动力响应规律,表现出上下盘效应和非一致性,上盘的动力响应更剧烈,影响范围更大;随着地震动强度的增大,上、下盘的动力放大效应均呈减弱趋势,同时上、下两盘的数值差异逐渐减小,上下盘效应也不再显著;地震波输入方向、频谱特性以及强震持时均对地裂缝场地的动力响应有很大影响,但影响规律和程度不尽相同。
To investigate the effects of ground motion parameters on the dynamic response of the ground fissures site during strong earthquakes and to explore the distribution law of dynamic amplification factors in the soil of ground fissures site,a series of shaking table tests and numerical simulations were conducted based on the ground fissures site in Xi′an.The results showed that the acceleration and Arias intensity amplification factors increased with the buried depth,and the factors of ground surface were much greater than those at the bottom of the soil.Under the unidirectional and multidirectional earthquakes,the dynamic response of the ground fissures site had different dynamic response laws,showing"hanging-wall and footwall effect"and inconsistency.The dynamic response of the hanging-wall was more intense and the influence range was larger.With the increase of the horizontal seismic intensity,the dynamic amplification factors of the hanging-wall and footwall decreased.Besides,the discrepancies of dynamic response between the hanging-wall and footwall decreased significantly,which means that the"hanging-wall and footwall effect"is no longer significant.The input direction,spectrum characteristics and strong ground motion duration of seismic wave all had a great influence on the dynamic response of ground fissures site,but both the influence law and degree are different.
作者
张朝
聂绪致
熊仲明
许有俊
张旭
ZHANG Chao;NIE Xuzhi;XIONG Zhongming;XU Youjun;ZHANG Xu(College of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Academician Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Science and Technology,Baotou 014010,China;College of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第5期110-118,共9页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51278399)
住房与城市建设部自然基金项目(2019-k-044)
内蒙古自然基金项目(2021BS05013)。
关键词
地裂缝场地
振动台试验
数值模拟
地震动参数
动力响应
ground fissures site
shaking table test
numerical simulation
ground motion parameters
dynamic response
