| 饱和多孔介质散射问题中局部地形影响的显式数值分析法 |
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| 引用本文： | 李立云,杜修力.饱和多孔介质散射问题中局部地形影响的显式数值分析法[J].北京工业大学学报,2008,34(9). |
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| 作者姓名： | 李立云 杜修力 |
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| 作者单位： | 北京工业大学,城市与工程安全减灾省部共建教育部重点实验室,北京,100022;北京工业大学,城市与工程安全减灾省部共建教育部重点实验室,北京,100022 |
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| 基金项目： | 国家自然科学基金，北京市属市管高校人才强教计划，北京市教育委员会科学技术与研究生建设项目 |
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| 摘 要： | 为了能合理分析局部场地条件对地震波散射波场的影响,基于饱和多孔介质理论的土力学模型,提出了一种显式有限元与黏弹性人工边界相结合的数值波动模拟方法.采用二维模型,以圆弧形凹陷河谷为例,分析了局部地形对饱和多孔介质中散射地震波场的影响,并通过与远置边界结果的对比,说明了该方法的正确性和适用性.
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| 关 键 词： | 饱和多孔介质 地形效应 显式有限元法 黏弹性人工边界 |
Explicit Numerical Wave Method of Analyzing the Topographical Effect on Near-field Wave Diffraction in Saturated Porous Media |
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| LI Li-yun,DU Xiu-li.Explicit Numerical Wave Method of Analyzing the Topographical Effect on Near-field Wave Diffraction in Saturated Porous Media[J].Journal of Beijing Polytechnic University,2008,34(9). |
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| Authors: | LI Li-yun DU Xiu-li |
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| Abstract: | Based on the soil mechanic model in saturated porous media,by combining viscous-spring artificial boundary with the 2-D explicit finite element method,an explicit numerical wave method is proposed to analyze the effect of the local terrain on the dynamic response of saturated site under diffracting earthquake wave field.Then,a 2-D semicircular valley model is used to analyze the topographical effect on the diffracting earthquake wave field in the saturated site.A comparison is made between the numerical solution and the far boundary solution.And the result indicates that the proposed method is correct and applicable. |
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| Keywords: | saturated porous media topographical effect explicit finite element method viscous-spring artificial boundary |
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