地震作用下地裂缝场地地表动力响应特性研究  

Dynamic Response and Characteristics of the Ground Fissure Site under Earthquake

作　　者：熊仲明[1] 王靖东 张朝 霍晓鹏[1] 王丙锐 XIONG Zhongming;WANG Jingdong;ZHANG Chao;HUO Xiaopeng;WANG Bingrui(College of Civil Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,China;China Northwest Architecture Design and Research Institute Co.Ltd,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]中国建筑西北设计研究院有限公司,陕西西安710055

出　　处：《防灾减灾工程学报》2022年第1期60-68,134,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51278395);陕西省自然科学基础研究计划重点项目(2018JZ5008);住建部科学技术基金项目(2019-k-044)资助。

摘　　要：为了准确描述地裂缝场地动力特征,利用ABAQUS有限元软件建立了地裂缝场地三维动力数值分析模型,定量分析了地裂缝场峰值加速度(PGA)、峰值速度(PGV)、Housner强度(HI)和Arias强度(I_(a))在不同地震作用下的变化趋势,获得了地裂缝场地动力响应规律,并与振动台模型试验结果进行了对比,表现出较好的一致性。结果表明:上盘的动力响应放大系数及影响范围均比下盘大,在地裂缝附近达到最大并向两侧递减,呈“λ”分布;随着地震烈度增大,土体软化程度增强,动力响应放大系数和裂缝两侧放大系数的差值逐渐减小;场地下盘的地震动长周期分量较丰富,平均周期相对上盘表现出较大的特性;在同一地震烈度不同输入方向引起的上、下盘动力响应中,垂直地裂缝方向作用的地震波对场地破坏较为严重。其研究结果可为地裂缝场地的工程应用提供重要参考。In order to accurately describe the dynamic characteristics of the ground fissure site,a 3-D dynamic numerical simulation model of the ground fissure site was established with the ABAQUS program.The dynamic response of peak ground acceleration(PGA),peak ground velocity(PGV),Housner Intensity(HI)and Arias Intensity(I_(a))was obtained under strong earthquake.The validity of the simulation was verified with a shaking table model test.The results show that the dynamic amplification factor and the range of influence of the hanging wall were larger than those of the footwall.The maximum value of the dynamic amplification factor was recorded close to the ground fissure and decreased from the ground fissure to both sides,showing λ-shaped.With the increase of seismic intensity,the amplification factor and the difference of dynamic response between the hanging wall and footwall gradually decreased due to the non-linear and softening behavior of the soil.Because the seismic long-period component of the footwall was more abundant,the mean period of the hanging wall was larger than that of the footwall.It was more serious to site damage during an earthquake along the vertical direction of the ground fissure with the same seismic intensity.The results provide references for engineering application of ground fissures sites.

关 键 词：地裂缝场地 动力响应 特征描述 数值模拟 无限元 

分 类 号：TU435[建筑科学—岩土工程]