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<p>Understanding the three-dimensional in-situ stress field is crucial for estimating the stability of large deep underground powerhouse. However, due to the insufficient representativeness and unreliability of in-situ stress measurements, it is difficult to determine the complete 3D in-situ stress field around large deep underground powerhouse based on limited in-situ stress data points. This study focuses on the underground powerhouse of the GX hydropower station. After introducing the geological conditions and topography of the underground powerhouse area, the in-situ stress test results are interpreted to clarify the distribution characteristics of natural stresses in the project area. Notably, in the region of the large underground powerhouse area, the horizontal major principal stress ranges from 16.81 to 32.64&#xa0;MPa, and the horizontal minor principal stress ranges from 9.35 to 18.22&#xa0;MPa, indicating relatively high stress levels. The measured principal stress in the underground powerhouse is generally oriented towards the NE, with the in-situ stress being primarily dominated by horizontal tectonic stress. Additionally, a new in-situ stress field calculation framework was proposed, which was used to invers the in-situ stress in the underground powerhouse area. A noteworthy finding is that topography and geological structures are the main factors influencing the distribution of in-situ stress. The distribution of principal stresses is generally proportional to depth, with principal stresses increasing to varying degrees as depth increases. However, in local fault zones, stress release occurs, and the in-situ stress field is significantly segmented.</p>

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Inversion Study of In-Situ Stress in the Underground Powerhouse Area of a Large Hydropower Project in Southwest China

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Xiaoyi Xu,
  • Weiya Xu,
  • Ning Sun,
  • Yunzi Wang,
  • Rubin Wang,
  • Long Yan

摘要

Understanding the three-dimensional in-situ stress field is crucial for estimating the stability of large deep underground powerhouse. However, due to the insufficient representativeness and unreliability of in-situ stress measurements, it is difficult to determine the complete 3D in-situ stress field around large deep underground powerhouse based on limited in-situ stress data points. This study focuses on the underground powerhouse of the GX hydropower station. After introducing the geological conditions and topography of the underground powerhouse area, the in-situ stress test results are interpreted to clarify the distribution characteristics of natural stresses in the project area. Notably, in the region of the large underground powerhouse area, the horizontal major principal stress ranges from 16.81 to 32.64 MPa, and the horizontal minor principal stress ranges from 9.35 to 18.22 MPa, indicating relatively high stress levels. The measured principal stress in the underground powerhouse is generally oriented towards the NE, with the in-situ stress being primarily dominated by horizontal tectonic stress. Additionally, a new in-situ stress field calculation framework was proposed, which was used to invers the in-situ stress in the underground powerhouse area. A noteworthy finding is that topography and geological structures are the main factors influencing the distribution of in-situ stress. The distribution of principal stresses is generally proportional to depth, with principal stresses increasing to varying degrees as depth increases. However, in local fault zones, stress release occurs, and the in-situ stress field is significantly segmented.