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Numerical Study on Damage Zones Induced by Excavation and Ventilation in a High-Temperature Tunnel at Depth

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  • Jianyu Li

    (Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education, Chengdu 610065, China
    School of Civil Engineering, Dalian University of Technology, Dalian 116024, China)

  • Hong Li

    (School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
    State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Zheming Zhu

    (Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education, Chengdu 610065, China)

  • Ye Tao

    (State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Chun’an Tang

    (School of Civil Engineering, Dalian University of Technology, Dalian 116024, China)

Abstract

Geothermal power is being regarded as depending on techniques derived from hydrocarbon production in worldwide current strategy. However, it has artificially been developed far less than its natural potentials due to technical restrictions. This paper introduces the Enhanced Geothermal System based on Excavation (EGS-E), which is an innovative scheme of geothermal energy extraction. Then, based on cohesion-weakening-friction-strengthening model (CWFS) and literature investigation of granite test at high temperature, the initiation, propagation of excavation damaged zones (EDZs) under unloading and the EDZs scale in EGS-E closed to hydrostatic pressure state is studied. Finally, we have a discussion about the further evolution of surrounding rock stress and EDZs during ventilation is studied by thermal-mechanical coupling. The results show that the influence of high temperature damage on the mechanical parameters of granite should be considered; Lateral pressure coefficient affects the fracture morphology and scale of tunnel surrounding rock, and EDZs area is larger when the lateral pressure coefficient is 1.0 or 1.2; Ventilation of high temperature and high in-situ stress tunnel have a significant effect on the EDZs scale; Additional tensile stress is generated in the shallow of tunnel surrounding rock, and the compressive stress concentration transfers to the deep. EDZs experiences three expansion stages of slow, rapid and deceleration with cooling time, and the thermal insulation layer prolongs the slow growth stage.

Suggested Citation

  • Jianyu Li & Hong Li & Zheming Zhu & Ye Tao & Chun’an Tang, 2021. "Numerical Study on Damage Zones Induced by Excavation and Ventilation in a High-Temperature Tunnel at Depth," Energies, MDPI, vol. 14(16), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4773-:d:609265
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    References listed on IDEAS

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    2. Abdul Muntaqim Naji & Hafeezur Rehman & Muhammad Zaka Emad & Saeed Ahmad & Jung-joo Kim & Hankyu Yoo, 2019. "Static and Dynamic Influence of the Shear Zone on Rockburst Occurrence in the Headrace Tunnel of the Neelum Jhelum Hydropower Project, Pakistan," Energies, MDPI, vol. 12(11), pages 1-17, June.
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    4. Shortall, Ruth & Davidsdottir, Brynhildur & Axelsson, Guðni, 2015. "Geothermal energy for sustainable development: A review of sustainability impacts and assessment frameworks," Renewable and Sustainable Energy Reviews, Elsevier, vol. 44(C), pages 391-406.
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