回填土不确定性对场地地震反应的影响

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英文篇名：Influence of the Uncertainty of Backfilled Soil on Site Seismic Response 作者：张海 ; 陈贺 ; 尤红兵 ; 李克强 英文作者：ZHANG Hai;CHEN He;YOU Hongbing;LI Keqiang;Tianjin Key Laboratory of Civil Structure Protection and Reinforcement;College of Civil Engineering, Tianjin Chengjian University;China Earthquake Disaster Prevention Center;Fujian Jiabo Joint Tsukito Design Inc; 关键词：剪切波速 ; 地震动 ; 峰值加速度 ; 反应谱 英文关键词：shear wave velocity;;ground motion;;peak acceleration;;response spectrum 中文刊名：ZBDZ 英文刊名：China Earthquake Engineering Journal 机构：天津市土木建筑结构防护与加固重点实验室;天津城建大学土木工程学院;中国地震灾害防御中心;福建嘉博联合设计股份有限公司; 出版日期：2019-04-15 出版单位：地震工程学报 年：2019 期：v.41 基金：国家自然科学基金项目(51248004);; 天津市自然科学基金(17JCYBJC21700);; 天津市“131”创新型人才培养工程人选计划;; 天津市高校“学科领军人才培养计划”人才培养计划 语种：中文; 页：ZBDZ201902015 页数：8 CN：02 ISSN：62-1208/P 分类号：106-113

摘要

选取某核电场地控制性钻孔的厚度、剪切波速、密度等实际勘探数据,通过改变回填土剪切波速,分析了回填土不确定性对场地地震动参数的影响。研究结果表明:在回填土层厚度不变和模型总厚度不变的情况下,地表的水平向峰值加速度随着回填土剪切波速的增大而减小,但水平向峰值加速度增幅逐渐减小;回填土剪切波速到达一定的波速就不再影响地表水平峰值加速度;随着回填土剪切波速的增加,整个反应谱的谱值都普遍减小。
        Ground motion characteristics are relatively affected by the local conditions of the site, and the site often needs backfill and foundation treatment before construction. Therefore, it is necessary to study the influence of the backfilled layer on the seismic response of the site. In this paper, we analyzed the two-dimensional seismic response of a nuclear power site with the software MIDAS GTS NX, i.e., thickness, shear wave velocity, and density of controlled boreholes at the site. Time histories of input ground motion have a great impact on ground motion parameters, thus the results of these parameters can vary significantly. To maximize the response of the structure and narrow the gap between earthquake action on the structure and the actual earthquake action, five time-history samples were fitted as the input seismic ground motion, and three models with different shear wave velocities of backfilled soil layer were established. The results showed that, with constant thickness of backfilled soil and constant total thickness of the model, the horizontal peak acceleration of the surface decreases with increasing shear wave velocity of the backfilled soil, but the amplitude was gradually reduced. The surface horizontal peak acceleration will no longer be affected when the shear wave velocity reaches a certain value. We also found that with increasing shear wave velocity of backfilled soil, the spectral value of the entire response spectrum will generally decrease.

引文

[1] 周志光,孙朝鑫.东日本大地震福岛核电厂震动实测数据分析[J].地震工程与工程振动,2016,36(3):8-15.ZHOU Zhiguang,SUN Chaoxin.Seismic Response Analysis of Fukushima Nuclear Power Plants under the 2011 Great Eastern Japan Earthquake[J].Earthquake Engineering and Engineering Vibration,2016,36(3):8-15.
    [2] 太树刚,李建有,石宝文,等.昆明盆地土体动力参数对土层地震反应影响研究[J].地震工程学报,2016,38(3):382-390.TAI Shugang,LI Jianyou,SHI Baowen,et al.Effect of Soil Dynamic Parameters on Seismic Response of Soil Layers in Kunming Basin[J].China Earthquake Engineering Journal,2016,38(3):382-390.
    [3] 翟庆生.基于土层结构的场地分类方法的研究[D].哈尔滨:中国地震局工程力学研究所,2003.ZHAI Qingsheng.Study on the Method of Site Classification Based on Soil Layer Construction[D].Haerbin:Institute of Engineering Mechanics,China Earthquake Agency,2003.
    [4] 杨书燕.特殊地形上结构非线性地震反应的研究[D].天津:天津大学,2006.YANG Shuyan.A Nonlinear Seismic Response Study of Structure on Special Site[D].Tianjin:Tianjin University,2006.
    [5] 李小军,彭青,刘文忠.设计地震动参数确定中的场地影响考虑[J].世界地震工程,2001,17(4):34-41.LI Xiaojun,PENG Qing,LIU Wenzhong.Consideration of Site Effects for Determination of Design Earthquake Ground Motion Parameters[J].World Information on Earthquake Engineering,2001,17(4):34-41.
    [6] 李小军,彭青.不同类别场地地震动参数的计算分析[J].地震工程与工程振动,2001,21(1):29-36.LI Xiaojun,PENG Qing.Calculation and Analysis of Earthquake Ground Motion Parameters for Different Site Categories[J].Earthquake Engineering and Engineering Vibration,2001,21(1):29-36.
    [7] 李恒,张静波,吴建超.软夹层和硬夹层对地表地震动特性的影响[J].地震工程学报,2014,36(3):441-445.LI Heng,ZHANG Jingbo,WU Jianchao.Effects of Soft and Hard Interlayers on Ground Motion Characteristics[J].China Earthquake Engineering Journal.2014,36(3):441-445.
    [8] 张海,李克强,尤红兵,等.硬夹层埋深对场地地震动参数的影响[J].地震工程学报,2016,38(6):935-941.ZHANG Hai,LI Keqiang,YOU Hongbing,et al.Influence of the Buried Depth of Hard Interlayer on Ground-Motion Parameters[J].China Earthquake Engineering Journal,2016,38(6):935-941.
    [9] 文雯.覆盖层厚度对土层地表峰值加速度和反应谱的影响[D].合肥:中国科学技术大学,2012.WEN Wen.Effects of the Thickness of Overburden Layer on Peak Accelerations of Ground Motions and Response Spectra[D].Hefei:University of Science and Technology of China,2012.
    [10] 黄坤朋.表层土结构对土体地震反应影响研究[D].大连:大连理工大学,2014.HUANG Kunpeng.The Effect of Surface Soil Structure on Soil Seismic Response[D].Dalian:Dalian University of Technology,2014.