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Study on the shear deformation of intralayer shear bands at the Baihetan hydropower station dam foundation

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Abstract

The engineering geological environments of the Baihetan hydropower station dam site are complicated due to the existence of columnar jointed basalt with faults and intralayer shear band structures. In the excavation process of the left dam foundation, relaxation and deformation of the columnar jointed basalt and the unloading shear deformation of the intralayer shear bands are both important engineering geological problems. Taking a typical intralayer shear band exposed during the excavation of the left dam foundation of the Baihetan hydropower station as an example, the unloading shear deformation of the intralayer shear band was investigated by in situ testing and numerical analysis in this study. The results confirmed that the unloading shear deformation of the intralayer shear bands can present an instability risk for the left dam foundation due to their poor mechanical strength and shearing damage. Therefore, a reinforcement measure of intralayer shear bands is critical for the stability assessment of similar structures.

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Funding

This study was financially supported by the National Key R&D Program of China (Grant No. 2017YFC1501000) and the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project (Grant No. SKLGP2019Z007).

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Authors and Affiliations

  1. Powerchina Huadong Engineering Corporation Limited, Hangzhou, China

    Shi Anchi, Wu Jiayao & Tang Mingfa

  2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu University of Technology, Chengdu, China

    Wei Yufeng

  3. China Three Gorges Projects Development Co. Ltd, Chengdu, China

    Ren Dachun

Authors
  1. Shi Anchi
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  2. Wei Yufeng
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  3. Wu Jiayao
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  4. Ren Dachun
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  5. Tang Mingfa
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Correspondence to Wei Yufeng.

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Shi, A., Wei, Y., Wu, J. et al. Study on the shear deformation of intralayer shear bands at the Baihetan hydropower station dam foundation. Bull Eng Geol Environ 79, 3517–3532 (2020). https://doi.org/10.1007/s10064-020-01799-7

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  • DOI: https://doi.org/10.1007/s10064-020-01799-7

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