考虑深厚覆盖层结构特性的场地地震反应分析研究

发布时间：2018-01-07 06:05

本文关键词：考虑深厚覆盖层结构特性的场地地震反应分析研究　出处：《水力发电学报》2015年01期 　论文类型：期刊论文

【摘要】：复杂深厚覆盖层的存在,使得从底部基岩输入的地震波在向上传播至结构-地基系统建基面时,地震动特性发生明显改变,进而显著影响其上修建结构的地震反应特性。本文针对峡谷区土石坝复杂深厚覆盖层场地条件,建立能够考虑覆盖层结构性沿竖直和水平方向都变化的场地地震反应分析模型,采用基于有效应力法的有限元分析方法,研究覆盖层结构特性对其地震动特性的影响规律。研究表明:河谷基岩地形条件、覆盖层的厚度、水平向上土层结构性变化、软弱层的存在以及场地上新建土石坝结构等,均会对覆盖层的地震动特性产生明显影响;覆盖层结构性对其地震动特性的影响规律相对复杂,覆盖层不仅使得地震动幅值显著变化,也使得输入地震动的频谱特性发生明显改变。
[Abstract]:Complex deep overburden layer, the foundation from the bottom of the bedrock input seismic wave in the upward spread to the structure foundation system, change the characteristics of ground motion, thus greatly affecting the seismic response characteristics of the structure of the building. According to the canyon dam in deep overburden layer complex site conditions, to establish the analysis model the seismic response of structural layer along the vertical and horizontal direction are considering the variation, the effective stress finite element method analysis method based on the research of covering layer structure and characteristics of the influence of the characteristics of the ground motion. The results show that: the valley bedrock topography, the thickness of the cover layer, the horizontal soil structural changes, weak layer the existence and structure of new dam site, both of overburden layer ground motion characteristics have a significant impact; effect of cover structure on the characteristics of ground motion The regularity is relatively complex, and the cover layer not only makes the amplitude of the ground motion change significantly, but also makes the frequency characteristics of the input ground motion change obviously.

【作者单位】：中国水利水电科学研究院;流域水循环模拟与调控国家重点实验室;中国水电顾问集团北京勘测设计研究院;
【基金】：国家重点基础研究发展计划(973计划)(2013CB036404) 国家科技支撑计划课题(2013BAB06B02) 中国水利水电科学研究院科研专项(岩集1467)
【分类号】：TU435
【正文快照】： 0引言对于修建在深厚覆盖层上的结构(包括土石坝),如果结构的规模相对覆盖层地基规模小得多,在结构静动力分析时,应当将覆盖层地基截断,只取临近结构的覆盖层地基连同结构一起作为计算分析对象[1]。此时,由于深厚覆盖层的存在,使得地下深处基岩表面传播而来的地震波在到达结构

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