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Coupled Hydraulic-Mechanical Experimental System for Evaluating Dynamic Mechanical and Transport Behaviors of Deep Rocks

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Abstract

Background

The dynamic mechanical properties and permeability evolution of deep rocks under coupled osmotic-mechanical conditions are vital for evaluating the stability of surrounding rock in deep rock engineering and further improving deep mining efficiency. However, there is currently no valid experimental system to measure both the dynamic mechanical response and the permeability evolution of deep rocks.

Objective

In this study, a novel experimental system is developed for determining dynamic compressive properties and permeability evolution of deep rocks subjected to coupled differential pore pressure and confinement.

Methods

The experimental system is composed of a dynamic loading system, an in-situ stress system, a differential pore pressure system, and a data acquisition system. The differential pore pressure system is introduced in the dynamic loading system, and the validation of the proposed system is verified by checking the stress wave propagation in the bars and the dynamic force balance on the two loading ends of specimens. It indicates that the differential pore pressure device added to the dynamic loading system barely influences the measurement of the dynamic behaviors of rocks. A homogenous green sandstone (GS) is employed to verify the feasibility and reliability of the proposed system. Dynamic compressive strength, permeability evolution, and failure mode of GS under cyclic dynamic impact loading in combination with coupled osmotic-confining pressure are explored using the proposed system.

Results

The stress–strain curves change with the increase of impact number, and the cyclic impacts deteriorate the dynamic compressive strength of GS. The permeability of GS first increases and then decreases with the impact number. The differential pore pressure enhanced the permeability of GS under the same impact cycle. The main fracture mode of the GS specimen is mainly compressive-shear fracture in combination with a tensile fracture in the middle of the specimen due to the coupling effect of the reflected stress wave and the osmotic-confining pressure.

Conclusions

The proposed experimental system is valid and effective to measure and observe the dynamic compressive behaviors and permeability evolution of rocks under coupled osmotic-mechanical conditions.

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Data Availability

The related data used to support the findings of this study are included within the article and are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 42141010, 12172253, and 12072369) and the Natural Science Foundation of Hunan Province (2022JJ10058).

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Authors and Affiliations

  1. College of Sciences, National University of Defense Technology, Changsha, 410073, China

    R. Chen

  2. State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, School of Civil Engineering, Tianjin University, Tianjin, 300072, China

    R. Chen, Y. Xu & W. Yao

  3. Yalong River Hydropower Development Company, Ltd., Chengdu, 610065, Sichuan, China

    G. Zhao

  4. China National Coal Group Corporation, 1 Huangsi St., Chaoyang District, Beijing, 100120, China

    W. Yao

  5. Institute of Geosafety, China University of Geosciences (Beijing), Beijing, 100083, China

    K. Xia

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Contributions

Conceptualization: Kaiwen Xia, Wei Yao; Methodology: Kaiwen Xia, Wei Yao, Geli Zhao, Rong Chen; Formal analysis and investigation: Rong Chen, Geli Zhao, Ying Xu, Weili Yao, Kaiwen Xia; Writing—original draft preparation: Wei Yao, Rong Chen, Geli Zhao; Writing—review and editing: Rong Chen, Wei Yao, Geli Zhao, Ying Xu, Weili Yao; Funding acquisition: Kaiwen Xia, Ying Xu, Wei Yao; Resources: Kaiwen Xia, Wei Yao.

Corresponding author

Correspondence to W. Yao.

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K. Xia is a member of SEM.

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Chen, R., Zhao, G., Xu, Y. et al. Coupled Hydraulic-Mechanical Experimental System for Evaluating Dynamic Mechanical and Transport Behaviors of Deep Rocks. Exp Mech (2024). https://doi.org/10.1007/s11340-024-01063-z

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