Volume 39 Issue 5
Oct.  2025
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Gong Daoping, Fang Qiang, Hu Huihua, Wang Si. Suitability of highway bridge foundation in karst breccia canyon slope[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 724-730. doi: 10.20265/j.cnki.issn.1007-2993.2024-0430
Citation: Gong Daoping, Fang Qiang, Hu Huihua, Wang Si. Suitability of highway bridge foundation in karst breccia canyon slope[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 724-730. doi: 10.20265/j.cnki.issn.1007-2993.2024-0430

Suitability of highway bridge foundation in karst breccia canyon slope

doi: 10.20265/j.cnki.issn.1007-2993.2024-0430
  • Received Date: 2024-09-18
  • Accepted Date: 2025-04-09
  • Rev Recd Date: 2025-03-05
  • Publish Date: 2025-10-10
  • Karst breccia is a special type of sedimentary rock with a unique diagenetic environment and characteristics. Especially the karst breccia located on the slope of the canyon bank, under favorable groundwater discharge conditions, the later karst process will further deteriorate the mechanical properties of the rock mass and affect the stability of the foundation and the overall stability of the bank slope. Therefore, the suitability evaluation of the foundation of canyon bank slope composed of karst breccia for super large bridges is particularly crucial and important, which determines the type and scale of bridge structure based on this in engineering construction. This article takes the bank slope of the Lishui Grand Bridge Canyon on the Zhangjiajie Huayuan Expressway as the engineering background, and the structural characteristics and karst development characteristics of karst breccia have been revealed through adits and drilling surveys. Through overall slope reliability analysis, it has been demonstrated that the probability of deformation and failure of the bank slope under design loads exceeds 20%. According to a comprehensive engineering geological analysis, the karst breccia on the Zhangjiajie shore is not suitable as the foundation for the suspension bridge tower. Thus, a geological decision was made to adjust the cable bent tower to a dolomite conglomerate with better mechanical properties. This research has ensured the completion and opening of the Lishui Extra Large Bridge and provided new important references for the survey and design of super large bridges crossing canyons.

     

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