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Effect of Hydrothermal Fluid Backfill on the Mechanical Behavior of Deep Granite Under High-Temperature and High-Pressure Conditions

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Abstract

Deep hot dry rock (HDR) masses undergo complex geological structural changes, forming fractured-subsequently filled granite. Owing to the different diagenetic and geological environments, the mineral compositions and microstructures of deep HDR masses are significantly different from those of shallow granites. The static parameters and mechanical properties of granite parent rock, hydrothermal fluid backfill, and fractured-subsequently filled granite under high temperature (500 ℃) and high pressure were studied to examine the effect of hydrothermal fluid backfill on the characteristics of deep, natural granite, and thus guide HDR geothermal exploitation. The results showed that the fractured-subsequently filled granite near the cementation interface had the largest longitudinal wave velocity and lowest porosity. A two-stage change in the elastic modulus of the fractured-subsequently filled granite was observed with increasing temperature, and the hydrothermal fluid backfill exhibited the minimum elastic modulus. The cementation interface develops into a weak-plane structure at high temperatures; as a result, the fractured-subsequently-filled granite near the cementation interface has the minimum compressive strength. In addition, the main shear fracture plane extended along the cementation interface when the angle between the cementation interface and the horizontal plane was 65°–69°. The different mineral compositions and microstructures of the granite parent rock and hydrothermal fluid backfill, as well as the healing effect near the cementation interface, result in changes in the physical and mechanical properties of the granite near the cementation interface.

Highlights

  • Granite near cementation interface has the largest longitudinal wave velocity, the lowest porosity and the minimum compressive strength.

  • A two-stage change of fractured-subsequently filled granite elastic modulus with increasing temperature was observed.

  • Dissolution pore structure leads to the lowest elastic modulus of hydrothermal fluid backfill within 500 ℃.

  • The shear fracture plane extends along cementation interface when the angle between cementation interface and horizontal plane is 65°–69°.

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Data availability

All data generated or analyzed during this study are included in this published article and are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52122405), the project of the major special plan of science and technology of Shanxi Province (Grant Nos. 202101060301024), and the Basic Research Program of Shanxi Province (Free Exploration) (Grant Nos. 202103021223071).

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Authors and Affiliations

  1. Key Laboratory of In-Situ Modification Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China

    Weitao Yin, Yangsheng Zhao & Zijun Feng

  2. Department of Mining Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Weitao Yin, Yangsheng Zhao & Zijun Feng

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  1. Weitao Yin
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  2. Yangsheng Zhao
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Correspondence to Zijun Feng.

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Yin, W., Zhao, Y. & Feng, Z. Effect of Hydrothermal Fluid Backfill on the Mechanical Behavior of Deep Granite Under High-Temperature and High-Pressure Conditions. Rock Mech Rock Eng 56, 4923–4937 (2023). https://doi.org/10.1007/s00603-023-03310-6

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