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<p>The geostress field in valley areas with high tectonic stress is an important factor to consider in the construction of major projects. Taking the bank slope of the Dadu River Bridge in Luding County, China as an example, multiple methods were integrated to establish a numerical model. The unloading and secondary stress characteristics of the bank slope rock mass are then quantitatively researched through the multi-stage total process evolution of river undercutting. The results show that both slopes of the Dadu River Bridge had undergone significant geostress release and unloading rebound to the slope surface when the Dadu River cut down to the present-day valley. There was a low geostress zone (unloading relaxation zone) with a 40 ~ 70&#xa0;m thickness in the shallow surface of the slope, and a high geostress zone occurred 120 ~ 250&#xa0;m below the riverbed surface. There were “hump geostress” zones developed 150 ~ 500&#xa0;m from the horizontal distance to the bank surface. Based on the research results, the concept and connotation of the hump index of geostress are proposed and defined to characterize the elevation degree of “hump geostress” compared with normal geostress. Understanding the spatial distribution of the geostress on bank slopes will have significant practical meaning for guiding geohazard prevention and mitigation and the construction and operation management of the Dadu River grand bridge.</p>

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Insight into unloading and geostress characteristics of high slopes based on valley evolution: a case study in Luding county, China

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Hongfu Zhou,
  • Shuwu Li,
  • Fan Yang,
  • Tian Fang,
  • Rui Li,
  • Jingyi Xue,
  • Jinpeng Hu,
  • Jiang Xing

摘要

The geostress field in valley areas with high tectonic stress is an important factor to consider in the construction of major projects. Taking the bank slope of the Dadu River Bridge in Luding County, China as an example, multiple methods were integrated to establish a numerical model. The unloading and secondary stress characteristics of the bank slope rock mass are then quantitatively researched through the multi-stage total process evolution of river undercutting. The results show that both slopes of the Dadu River Bridge had undergone significant geostress release and unloading rebound to the slope surface when the Dadu River cut down to the present-day valley. There was a low geostress zone (unloading relaxation zone) with a 40 ~ 70 m thickness in the shallow surface of the slope, and a high geostress zone occurred 120 ~ 250 m below the riverbed surface. There were “hump geostress” zones developed 150 ~ 500 m from the horizontal distance to the bank surface. Based on the research results, the concept and connotation of the hump index of geostress are proposed and defined to characterize the elevation degree of “hump geostress” compared with normal geostress. Understanding the spatial distribution of the geostress on bank slopes will have significant practical meaning for guiding geohazard prevention and mitigation and the construction and operation management of the Dadu River grand bridge.