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<p>In deeply buried, high-geothermal, and high-geo-stress tunnels, the coupling effects of regional stress and structural features are the primary factors influencing the stability of the surrounding rock. In this study, taking a deeply buried, high-geothermal tunnel crossing multiple active fault zones in western China as the research object, we investigated the coupling of the regional geo-stress and stratigraphic structural characteristics using temperature and in-situ stress data from deep boreholes. The impacts on geoengineering projects, including the stability of the active fault zones along the tunnel, the rockburst characteristics, which are influenced by the high-geothermal gradient, and the large deformation of the surrounding rock, were analyzed. The results showed that (1) the geo-stress and stratigraphic structural characteristics exhibited strong coupling effects in the high-geothermal tunnels. This was prominently manifested by the orientation of the maximum horizontal principal stress in the fault zone, which is either parallel to the fault strike or intersects with it at a very small angle, leading to structural segmentation of the fault. (2) The high-geothermal gradient intensified the stress concentration in the surrounding rock after tunnel excavation, accelerating the occurrence of rockbursts and increasing the intensity as the temperature increased. (3) The heat flow in the deep strata in the region created a high-geothermal environment for the tunnel, which generated additional thermal stress in the surrounding rock, leading to stress accumulation during the stress release process. This causes crack initiation, development, propagation, aggregation, and penetration in the surrounding rock, resulting in large rock deformation and a high-temperature-induced strong rheology. In conclusion, the research findings provide scientific references for ensuring the stability of the surrounding rock and for designing support structures in deeply buried, high-geothermal, and high-geo-stress tunnels.</p>

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Coupling Characteristics of Geo-stress and Stratigraphic Structure and Their Impacts on Geoengineering Projects in High Geothermal Tunnels

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Haibo Jiang,
  • Gang Wei,
  • Pengfei Xiang,
  • Shuangxi Li,
  • Chunmeng Jiang

摘要

In deeply buried, high-geothermal, and high-geo-stress tunnels, the coupling effects of regional stress and structural features are the primary factors influencing the stability of the surrounding rock. In this study, taking a deeply buried, high-geothermal tunnel crossing multiple active fault zones in western China as the research object, we investigated the coupling of the regional geo-stress and stratigraphic structural characteristics using temperature and in-situ stress data from deep boreholes. The impacts on geoengineering projects, including the stability of the active fault zones along the tunnel, the rockburst characteristics, which are influenced by the high-geothermal gradient, and the large deformation of the surrounding rock, were analyzed. The results showed that (1) the geo-stress and stratigraphic structural characteristics exhibited strong coupling effects in the high-geothermal tunnels. This was prominently manifested by the orientation of the maximum horizontal principal stress in the fault zone, which is either parallel to the fault strike or intersects with it at a very small angle, leading to structural segmentation of the fault. (2) The high-geothermal gradient intensified the stress concentration in the surrounding rock after tunnel excavation, accelerating the occurrence of rockbursts and increasing the intensity as the temperature increased. (3) The heat flow in the deep strata in the region created a high-geothermal environment for the tunnel, which generated additional thermal stress in the surrounding rock, leading to stress accumulation during the stress release process. This causes crack initiation, development, propagation, aggregation, and penetration in the surrounding rock, resulting in large rock deformation and a high-temperature-induced strong rheology. In conclusion, the research findings provide scientific references for ensuring the stability of the surrounding rock and for designing support structures in deeply buried, high-geothermal, and high-geo-stress tunnels.