Scholarlink

Abstract <p>The effect on seismic impacts of a thin low-velocity layer overlying a high-velocity rock, which is typical of crystalline shields of ancient platforms, is studied. The initial data for the analysis are the response spectrum and accelerograms compatible with them on bedrock. The peak acceleration value (PGA) is assumed to be 0.11 <i>g</i>, which approximately corresponds to a shaking intensity of 7 (MSK64 scale). The site response was calculated using the Monte Carlo approach using equivalent linear modeling for four models differing in the thickness of the upper layer. It is shown that even a slight increase in the thickness of the low-velocity layer can lead to noticeable increase of the peak acceleration of ground motion and a change in the shape of the response spectrum. The result warns against accepting the seemingly intuitively correct assumption that a slight change in soil thickness (adding 1 m of soil) will have virtually no effect on the parameters of seismic motion on the surface.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of a Thin Low-Velocity Ground Layer on Seismic Impact

  • 期刊论文

  • 发表日期：

    2025年6月11日

查看全文
  • R. E. Tatevossian,
  • A. V. Kalinina,
  • S. M. Ammosov

摘要

Abstract

The effect on seismic impacts of a thin low-velocity layer overlying a high-velocity rock, which is typical of crystalline shields of ancient platforms, is studied. The initial data for the analysis are the response spectrum and accelerograms compatible with them on bedrock. The peak acceleration value (PGA) is assumed to be 0.11 g, which approximately corresponds to a shaking intensity of 7 (MSK64 scale). The site response was calculated using the Monte Carlo approach using equivalent linear modeling for four models differing in the thickness of the upper layer. It is shown that even a slight increase in the thickness of the low-velocity layer can lead to noticeable increase of the peak acceleration of ground motion and a change in the shape of the response spectrum. The result warns against accepting the seemingly intuitively correct assumption that a slight change in soil thickness (adding 1 m of soil) will have virtually no effect on the parameters of seismic motion on the surface.