河漫滩-阶地复合地形场地的非线性地震反应特征
|
摘要
以滁州市地震小区划场地为原型,针对由河漫滩、阶地、波状起伏的低丘等组成的典型复合场地,基于ABAQUS软件显式有限元并行计算平台,建立了大尺度场地二维模型,考虑土体的非线性特征,以SH波作为输入地震动,分析了河漫滩-阶地复合场地地震动力响应特征.结果表明,(1)与基岩地震动峰值加速度相比,土层近地表范围内(15m以浅)峰值加速度均表现出明显的放大现象,15m以深土层地震动放大效应随深度增加而逐渐减弱,且随深度增大,PGA放大系数值逐渐小于1.0;(2)土层峰值加速度随着深度增加非单一递减,局部土层深度地震动出现聚集效应,这一现象在河漫滩区表现比较明显;(3)场地不同区域地震动放大效应差异较大,河漫滩区地震动放大效应要明显比阶地低丘区更大;且输入地震动峰值相同时,河漫滩区反应谱特征周期要大于阶地区域,两者差距达0.05—0.15s;(4)随着输入地震动增加,反应谱谱峰向长周期方向移动明显.
Take the seismic mic-rozonation site of Chuzhou City as background,a multi-geomorphic composite site consisting of alluvial flat,terraces,undulating hilly terrain was selected as prototype,considering the inhomogeneity of ground soils,based on the explicit FE method and parallel computing cluster platform of ABAQUS,a large-scale refined two-dimensional( 2D) FE nonlinear analytical model was established. The SH wave was taken as the bedrock earthquake motion and nonlinear seismic effect characteristics of the composite site were analyzed. The results show that:( 1) Compared with the input ground motion,the PGA of soils near the ground surface show an obvious amplification phenomenon,to soils deeper than 15 m,the seismic amplification effect seem weakened with the growth of depth,and gradually the amplification factor of PGA become smaller than 1. 0.( 2) The PGA display a non-monotonic decreasing characteristics with depth and a greater focusing effect of some particular soil layers,and this is more common in alluvial flat area.( 3) There are significant seismic effect difference among different locations of the site,when under the same input ground motion,the seismic amplification effect of alluvial flat area seems larger than that of terraces and low hill area,and with the increasing of input motion,the characteristic period values of acceleration response spectra of alluvial flat area are larger than that of terraces area,the difference between them comes to be 0. 05—0. 15s;( 4) With the increasing of input ground motion,the spectra peak moves to a larger period.
Take the seismic mic-rozonation site of Chuzhou City as background,a multi-geomorphic composite site consisting of alluvial flat,terraces,undulating hilly terrain was selected as prototype,considering the inhomogeneity of ground soils,based on the explicit FE method and parallel computing cluster platform of ABAQUS,a large-scale refined two-dimensional( 2D) FE nonlinear analytical model was established. The SH wave was taken as the bedrock earthquake motion and nonlinear seismic effect characteristics of the composite site were analyzed. The results show that:( 1) Compared with the input ground motion,the PGA of soils near the ground surface show an obvious amplification phenomenon,to soils deeper than 15 m,the seismic amplification effect seem weakened with the growth of depth,and gradually the amplification factor of PGA become smaller than 1. 0.( 2) The PGA display a non-monotonic decreasing characteristics with depth and a greater focusing effect of some particular soil layers,and this is more common in alluvial flat area.( 3) There are significant seismic effect difference among different locations of the site,when under the same input ground motion,the seismic amplification effect of alluvial flat area seems larger than that of terraces and low hill area,and with the increasing of input motion,the characteristic period values of acceleration response spectra of alluvial flat area are larger than that of terraces area,the difference between them comes to be 0. 05—0. 15s;( 4) With the increasing of input ground motion,the spectra peak moves to a larger period.
引文
[1]钱培风,沈蕴芬,郭载瑜,等.通海地震的某些震害与分析[J].地震研究,1984,7(3):357-363Qian Peifeng,Shen Yunfen,Guo Zaiyu,et al.Parts of seismic hazard in the tonghai earthquake and their analysis[J].Journal of Seismological Research,1984,7(3):357-363
[2]梁建文,张郁山,顾晓鲁,等.圆弧形层状沉积河谷场地在平面SH波入射下动力响应分析[J].岩土工程学报,2000,22(4):396-401Liang Jianwen,Zhang Yushan,Gu Xiaolu,et al.Surface motion of circular-arc layered alluvial valleys for incident plane SH waves[J].Chinese Jounal of Geotechnical Engineering,2000,22(4):396-401
[3]金峰,张楚汉,王光纶.半椭圆河谷上沉积层地震响应研究[J].清华大学学报,1993,33(5):23-30Jin Feng,Zhang Chuhan,Wang Guanglun.Seismic response of alluvial soil deposit on a semi--elliptical canyon[J].Journal of Tsinghua University(Science and Technology),1993,33(5):23-30
[4]袁晓铭,李雨润,孙锐.圆弧状沉积盆地与软土单覆盖层出平面地表运动对比[J].地震工程与工程振动,2002,22(4):16-21Yuan Xiaoming,Li Yurun,Sun Rui.Comparison of out-of-plane surface ground motion between a circular-arc alluvial valley and a single overburden soft layer[J].Earthquake Engineering and Engineering Vibration,2002,22(4):16-21
[5]Stewart J P,Sholtif S E.Case study of strong ground motion variations across cut slope[J].Soil Dynamics and Earthquake Engineering,2005,25:539-545
[6]杨宇,李小军,贺秋梅.自贡西山公园山脊场地地形和土层效应数值模拟[J].震灾防御技术,2011,6(4):437-447Yang Yu,Li Xiaojun,He Qiumei.Numerical simulation for site effect of ridge terrain and overlaying soil in Zigong Xishan Park[J].Technology for Earthquake Disaster Prevention,2011,6(4):437-447
[7]Banab K K,Kolaj M,Motazedian D,et al.Seismic site response analysis for Ottawa,Canada:A comprehensive study using measurements and numerical simulations[J].Bulletin of the Seismological Society of America,2012,102(5):1976-1993
[8]魏云杰,鲍艳,李战鲁.彭州市干溪沟流域地震诱发地质灾害成因分析[J].工程地质学报,2011,19(4):582-587Wei Yunjie,Bao Yan,Li Zhanlu.Genetic analysis of earthquake-induced geologic hazards in Ganxigou drainage basin of Pengzhou[J].Journal of Engineering Geology,2011,19(4):582-587
[9]郭碧云,傅旭东,张正峰.龙溪河流域震后次生地质灾害分布与地形及河床演变关系[J].应用基础与工程科学学报,2013,21(6):1005-1017Guo Biyun,Fu Xudong,Zhang Zhengfeng.Relationship between the topography,riverbed evolution and the secondary geological disasters after the earthquake in the Longxi River Basin[J].Journal of Basic Science and Engineering,2013,21(6):1005-1017
[10]毛昆明,陈国兴.基于Abaqus软件的并行计算异构集群平台的搭建[J].世界地震工程,2011,31(5):184-189Mao Kunming,Chen Guoxing.Construction of parallel computing heterogeneous cluster platform based on Abaqus software[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(5):184-189
[11]陈国兴.岩土地震工程学[M].北京:科学出版社,2007Chen Guoxing.Geotechnical earthquake engineering[M].Beijing:Science Press,2007
[12]刘晶波,谷音,杜义欣.一致黏弹性人工边界及黏弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075Liu Jingbo,Gu Yin,Du Yixin.Consistent viscous-spring artificial boundaries and viscous-spring boundary elements[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1070-1075
[2]梁建文,张郁山,顾晓鲁,等.圆弧形层状沉积河谷场地在平面SH波入射下动力响应分析[J].岩土工程学报,2000,22(4):396-401Liang Jianwen,Zhang Yushan,Gu Xiaolu,et al.Surface motion of circular-arc layered alluvial valleys for incident plane SH waves[J].Chinese Jounal of Geotechnical Engineering,2000,22(4):396-401
[3]金峰,张楚汉,王光纶.半椭圆河谷上沉积层地震响应研究[J].清华大学学报,1993,33(5):23-30Jin Feng,Zhang Chuhan,Wang Guanglun.Seismic response of alluvial soil deposit on a semi--elliptical canyon[J].Journal of Tsinghua University(Science and Technology),1993,33(5):23-30
[4]袁晓铭,李雨润,孙锐.圆弧状沉积盆地与软土单覆盖层出平面地表运动对比[J].地震工程与工程振动,2002,22(4):16-21Yuan Xiaoming,Li Yurun,Sun Rui.Comparison of out-of-plane surface ground motion between a circular-arc alluvial valley and a single overburden soft layer[J].Earthquake Engineering and Engineering Vibration,2002,22(4):16-21
[5]Stewart J P,Sholtif S E.Case study of strong ground motion variations across cut slope[J].Soil Dynamics and Earthquake Engineering,2005,25:539-545
[6]杨宇,李小军,贺秋梅.自贡西山公园山脊场地地形和土层效应数值模拟[J].震灾防御技术,2011,6(4):437-447Yang Yu,Li Xiaojun,He Qiumei.Numerical simulation for site effect of ridge terrain and overlaying soil in Zigong Xishan Park[J].Technology for Earthquake Disaster Prevention,2011,6(4):437-447
[7]Banab K K,Kolaj M,Motazedian D,et al.Seismic site response analysis for Ottawa,Canada:A comprehensive study using measurements and numerical simulations[J].Bulletin of the Seismological Society of America,2012,102(5):1976-1993
[8]魏云杰,鲍艳,李战鲁.彭州市干溪沟流域地震诱发地质灾害成因分析[J].工程地质学报,2011,19(4):582-587Wei Yunjie,Bao Yan,Li Zhanlu.Genetic analysis of earthquake-induced geologic hazards in Ganxigou drainage basin of Pengzhou[J].Journal of Engineering Geology,2011,19(4):582-587
[9]郭碧云,傅旭东,张正峰.龙溪河流域震后次生地质灾害分布与地形及河床演变关系[J].应用基础与工程科学学报,2013,21(6):1005-1017Guo Biyun,Fu Xudong,Zhang Zhengfeng.Relationship between the topography,riverbed evolution and the secondary geological disasters after the earthquake in the Longxi River Basin[J].Journal of Basic Science and Engineering,2013,21(6):1005-1017
[10]毛昆明,陈国兴.基于Abaqus软件的并行计算异构集群平台的搭建[J].世界地震工程,2011,31(5):184-189Mao Kunming,Chen Guoxing.Construction of parallel computing heterogeneous cluster platform based on Abaqus software[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(5):184-189
[11]陈国兴.岩土地震工程学[M].北京:科学出版社,2007Chen Guoxing.Geotechnical earthquake engineering[M].Beijing:Science Press,2007
[12]刘晶波,谷音,杜义欣.一致黏弹性人工边界及黏弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075Liu Jingbo,Gu Yin,Du Yixin.Consistent viscous-spring artificial boundaries and viscous-spring boundary elements[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1070-1075
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心