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ISSN 2096-7780 CN 10-1665/P

叶迎晨. 深厚覆盖层地区土层地震反应的不确定性分析 [J]. 地震科学进展, 2023, (5): 193-202. doi: 10.19987/j.dzkxjz.2023-011" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2023-011.
引用本文: 叶迎晨. 深厚覆盖层地区土层地震反应的不确定性分析 [J]. 地震科学进展, 2023, (5): 193-202. doi: 10.19987/j.dzkxjz.2023-011" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2023-011.
Yingchen Ye. Uncertainty analysis of seismic response of soil layer in deep overburden area [J]. Progress in Earthquake Sciences, 2023, (5): 193-202. doi: 10.19987/j.dzkxjz.2023-011" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2023-011.
Citation: Yingchen Ye. Uncertainty analysis of seismic response of soil layer in deep overburden area [J]. Progress in Earthquake Sciences, 2023, (5): 193-202. doi: 10.19987/j.dzkxjz.2023-011" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2023-011.

深厚覆盖层地区土层地震反应的不确定性分析

Uncertainty analysis of seismic response of soil layer in deep overburden area

  • 摘要: 以上海地区作为深厚覆盖层地区代表,在丰富的地质资料基础上,全面、系统地分析了100 m以深地层的土层分布、剪切波速、土动力特性参数、密度和地震输入界面这5个不确定因素可能的分布范围,并采用逻辑树分析方法,利用等效线性化土层地震反应分析,计算得到了这5种不确定因素在23种工况下3个超越概率、4个典型地质孔的地表峰值加速度和反应谱结果。经分析表明,100 m以深地层的土动力特性参数、剪切波速、土层分布、密度属于低敏感性因素,其不确定性对地表地震动参数影响较小,峰值加速度差异基本在5%以内;地震输入界面属于高敏感性参数,对地表地震动参数(尤其是低频段)影响较大,最大差异可达30%—40%。地震安全性评价工作中应合理设定地震输入界面,以避免可能对工程抗震设防参数带来的不利影响。

     

    Abstract: Taking Shanghai area as the representative of deep overburden area, based on abundant geological data, this paper comprehensively and systematically analyzes the possible distribution range of 5 uncertain factors, including soil layer distribution, shear wave velocity, soil dynamic characteristic parameters, density and seismic input interface, in a depth of 100 m, and uses the logic tree analysis method and equivalent linear method for seismic response analysis of soil layers, the surface peak acceleration and response spectrum results of 5 uncertain factors, 3 exceedance probabilities and 4 typical geological holes under 23 working conditions are calculated. It shows that the parameters of soil dynamic characteristics, shear wave velocity, soil layer distribution and density in the depth of 100 m are low sensitive parameters, and their uncertainty have little impact on the ground motion parameters, the difference of peak acceleration are basically within 5%. The seismic input interface is a highly sensitive parameter, which has a great impact on the ground motion parameters (especially to the low frequency band), with the maximum difference of 30%—40%. The seismic input interface should be reasonably set in the seismic safety evaluation to avoid the adverse impact on the seismic fortification parameters of the project.

     

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