Scholarlink

<p>A slope model features an irregular step-like topography, characterized by a broad upper valley and a lower steep canyon, commonly observed in the deep-cutting gorges of southwestern China. Its complex geological conditions, with surficial soil overlaying bedrock and bedding planes, make it highly susceptible to failure under earthquake loading. To systematically investigate the seismic response and failure mechanism of this kind of slope, a large-scale shaking table test was conducted. Results showed that in the elastic state, the peak ground motion acceleration (PGA) amplification in horizontal direction (AAF-X) reached a peak value of 3.0 at the upper gentle slope and 2.5 at the upper part of the lower steep slope, while PGA amplification in vertical direction (AAF-Z) reached a value of 1.5 at the slope break. The AAF-X along the slope surface increased first when the amplitude was less than 0.2 g, and then decreased as the amplitude increased, indicating a nonlinear dynamic response. Due to the spatial heterogeneity in shear wave velocity, high-frequency seismic components were primarily amplified at the inner slope and lower steep slope surface, while middle to low-frequency components were more significantly amplified at the upper gentle slope and slope break. Significant acceleration amplification and incoherent seismic forces contributed to the failure of the rock mass at the slope break. The failure mode was identified as tension-shear sliding and can be divided into four stages: minor deformation (Stage I), crack propagation (Stage II), crack coalescence (Stage III), and shear-slipping failure (Stage IV). Reinforcement measures, such as anti-slide piles and rock-socketed anchors, can be implemented at slope breaks and key structural interfaces in engineering practice. These findings highlight that the critical influence of complex geological conditions on seismic amplification and failure evolution of the slope, offering important insights for seismic stability assessment of slope in active tectonic gorge regions of southwest China.</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

Seismic response and failure evolution of an irregular slope containing bedding planes and high-position surficial soil layer

  • 期刊论文

  • 发表日期：

    2025年6月12日

查看全文
  • Qianqian Feng,
  • Yunsheng Wang,
  • Jianxian He,
  • Xiaolong Hu,
  • Haochen Wu,
  • Dongyu Hu,
  • Shicheng Liu,
  • Tao Tang

摘要

A slope model features an irregular step-like topography, characterized by a broad upper valley and a lower steep canyon, commonly observed in the deep-cutting gorges of southwestern China. Its complex geological conditions, with surficial soil overlaying bedrock and bedding planes, make it highly susceptible to failure under earthquake loading. To systematically investigate the seismic response and failure mechanism of this kind of slope, a large-scale shaking table test was conducted. Results showed that in the elastic state, the peak ground motion acceleration (PGA) amplification in horizontal direction (AAF-X) reached a peak value of 3.0 at the upper gentle slope and 2.5 at the upper part of the lower steep slope, while PGA amplification in vertical direction (AAF-Z) reached a value of 1.5 at the slope break. The AAF-X along the slope surface increased first when the amplitude was less than 0.2 g, and then decreased as the amplitude increased, indicating a nonlinear dynamic response. Due to the spatial heterogeneity in shear wave velocity, high-frequency seismic components were primarily amplified at the inner slope and lower steep slope surface, while middle to low-frequency components were more significantly amplified at the upper gentle slope and slope break. Significant acceleration amplification and incoherent seismic forces contributed to the failure of the rock mass at the slope break. The failure mode was identified as tension-shear sliding and can be divided into four stages: minor deformation (Stage I), crack propagation (Stage II), crack coalescence (Stage III), and shear-slipping failure (Stage IV). Reinforcement measures, such as anti-slide piles and rock-socketed anchors, can be implemented at slope breaks and key structural interfaces in engineering practice. These findings highlight that the critical influence of complex geological conditions on seismic amplification and failure evolution of the slope, offering important insights for seismic stability assessment of slope in active tectonic gorge regions of southwest China.