Consolidation-sealing of in-situ internal stress in deep rocks: Device development and mechanical behavior characterization

Abstract

Addressing the scientific problem of unclear understanding of in-situ internal stress and its evolution in deep rock masses, a scientific definition and implementation path for the concept of in-situ internal stress consolidation-sealing in deep rock masses are proposed, and a set of in-situ internal stress consolidation-sealing test device for deep rock masses has been independently developed. The device consists of a material consolidation cultivation module, an in-situ internal stress environment simulation module, and a multi-source information capture module. And the three mechanical tests of internal stress preservation, internal stress release and conventional were carried out with the device. The evolution law of the deformation parameters in the internal stress consolidation-sealing stage was studied, and the difference characteristics of the deformation parameters before and after the internal stress releasing were compared and analyzed. The results show that the internal stress consolidation-sealing significantly affects the mechanical properties of the simulated rock material, while the internal stress release leads to the damage of the material properties, suggesting that the presence and influence of internal stress should not be overlooked. This study could provide a new research direction and scientific devices for the expansion and deepening of the field of deep in-situ rock mechanics.

Keywords

Deep rock mass / In-situ rock mechanics / Internal stress consolidation-sealing / Test device

CRediT authorship contribution statement

Mingzhong Gao: Supervision, Methodology, Investigation, Funding acquisition, Conceptualization. Chuo Zhang: Writing – original draft, Methodology, Investigation, Formal analysis, Data curation. Fei Li: Writing – original draft, Methodology, Investigation, Formal analysis, Data curation. Bengao Yang: Writing – original draft, Supervision, Funding acquisition, Formal analysis, Conceptualization. Jing Xie: Validation, Supervision, Methodology. Zundong Yang: Writing – original draft, Software, Formal analysis. Kunchen He: Writing – original draft, Validation, Formal analysis, Data curation. Haichun Hao: Supervision, Formal analysis, Data curation.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgements

This research is financially supported by the National Natural Science Foundation of China (No. 52225403), the Open Fund by State Key Laboratory of Coal Mining and Clean Utilization (No. 2021-CMCU-KFZD001), Shenzhen National Science Foundation for Distinguished Young Scholars (No. RCJC20210706091948015), and the China Postdoctoral Science Foundation (Nos. 2025 T180507, 2024 M762221).

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