软夹层土对福州盆地地表地震动特性的影响
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摘要
以福州盆地为对象,基于ABAQUS有限元并行计算平台,建立二维非线性分析模型对地表地震动效应进行分析。结果表明,当输入地震动一定时,地表PGA随软弱层埋深变浅而增大,当埋深至一定深度时有减震作用;随软夹层埋深增加,地表加速度谱渐呈出多峰特征,特征周期增大;软夹层厚度对地表PGA影响与其埋深及输入地震动有关。
Fuzhou Basin is selected for the research.Based on the explicit FE method and computing cluster platform of ABAQUS,a large-scale two-dimensional(2D) FE model for Fuzhou Basin is established.The results show that,for given input ground motion and peak acceleration,the peak values of ground motion acceleration(PGA) response and their amplification factors will be lessening when the depth of soft interlayer is increased,however,when the depth of soft interlayer exceeds a critical value,there is an obvious cushioning effect.With the growth of depth of soft interlayer,the ground acceleration response spectra of Fuzhou Basin gradually appear a double-peak or multi-peak phenomenon and the corresponding feature period increases.The effect of thickness of soft interlayer on the seismic response is related to its depth and the input ground motion characteristics.
Fuzhou Basin is selected for the research.Based on the explicit FE method and computing cluster platform of ABAQUS,a large-scale two-dimensional(2D) FE model for Fuzhou Basin is established.The results show that,for given input ground motion and peak acceleration,the peak values of ground motion acceleration(PGA) response and their amplification factors will be lessening when the depth of soft interlayer is increased,however,when the depth of soft interlayer exceeds a critical value,there is an obvious cushioning effect.With the growth of depth of soft interlayer,the ground acceleration response spectra of Fuzhou Basin gradually appear a double-peak or multi-peak phenomenon and the corresponding feature period increases.The effect of thickness of soft interlayer on the seismic response is related to its depth and the input ground motion characteristics.
引文
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[5]李伟华,赵成刚.含软夹层的层状沉积河谷场地的地震动力响应分析.[J]岩土力学,2009,30(1):46-51.
[6]陈国兴,陈继华.软弱土层的厚度及埋深对深厚软弱场地地震效应的影响[J].世界地震工程,2004,20(3):66-73.
[7]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):396-401.
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[9]陈国兴,陈磊,景立平,等.地铁地下结构抗震分析并行计算的显式与隐式算法比较[J].铁道学报,2011,33(11):111-117.
[10]林晨.福州盆地工程地质特征及其勘察与施工[J].矿产保护和利用,2002(5):52-54.
[11]陈国兴.岩土地震工程学[M].北京:科学出版社,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):1070-1075.
[13]Jin Dandan,Chen Guoxing,Dong Feifan.Large-scale Two-dimensional Nonlinear Analysis on Seismic Effect of Fuzhou Basin[J].Applied Mechanics and Materials,2011(90-93):1426-1433.
[14]Jin Dandan,Chen Guoxing,Dong Feifan.Large-scale Two-dimensional Nonlinear FE Analysis on PGA Amplification Effect with Depth and Focusing Effect of Fuzhou Basin[J].International Journal of Terraspace Science and Engineering,2011,4(2):23-31.
[2]Chang-Guk Sun,Choong-Ki Chung.Assessment of Site Effects of a Shallow and Wide Basin Using Geotechnical Informa-tion-based Spatial Characterization[J].Soil Dynamic and Earthquake Engineering,2008,28:1028-1044.
[3]Makraa K,Chávez-García F J,Raptakis D,et al.Parametric Analysis of the Seismic Response of a2DSedimentary Val-ley:Implications for Code Implementations of Complex Site Effects[J].Soil Dynamics and Earthquake Engineering,2005,25(4):303-315.
[4]李雪强.沉积盆地地震效应研究[D].北京:中国地震局工程力学研究所,2011.
[5]李伟华,赵成刚.含软夹层的层状沉积河谷场地的地震动力响应分析.[J]岩土力学,2009,30(1):46-51.
[6]陈国兴,陈继华.软弱土层的厚度及埋深对深厚软弱场地地震效应的影响[J].世界地震工程,2004,20(3):66-73.
[7]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):396-401.
[8]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):184-189.
[9]陈国兴,陈磊,景立平,等.地铁地下结构抗震分析并行计算的显式与隐式算法比较[J].铁道学报,2011,33(11):111-117.
[10]林晨.福州盆地工程地质特征及其勘察与施工[J].矿产保护和利用,2002(5):52-54.
[11]陈国兴.岩土地震工程学[M].北京:科学出版社,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):1070-1075.
[13]Jin Dandan,Chen Guoxing,Dong Feifan.Large-scale Two-dimensional Nonlinear Analysis on Seismic Effect of Fuzhou Basin[J].Applied Mechanics and Materials,2011(90-93):1426-1433.
[14]Jin Dandan,Chen Guoxing,Dong Feifan.Large-scale Two-dimensional Nonlinear FE Analysis on PGA Amplification Effect with Depth and Focusing Effect of Fuzhou Basin[J].International Journal of Terraspace Science and Engineering,2011,4(2):23-31.
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