基于岩屑升尺度理论的岩石强度预测方法研究

doi:10.3724/1000-6915.jrme.2024.0886

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Abstract Rock mechanics parameters are crucial for the design and construction of deep underground engineering projects. However, their reliability is often compromised due to challenges in core extraction and in-situ testing. To tackle this issue, this study adopts a micro-scale perspective on rocks, introducing the Hill tensor to precisely describe the morphological distribution characteristics of different mineral components, as well as internal pores and fractures, at the micro-scale and their significant impact on the macro-scale physical and mechanical properties of rocks. Subsequently, upscaling theory is utilized to establish a functional relationship between the complex microstructure and macro-mechanical properties of rocks. Building on this foundation, a localized tensor is innovatively introduced to accurately represent the mathematical correlation between deformations at the micro-scale and the macro-scale. Throughout this process, the study thoroughly considers the damage mechanisms at the micro-scale, enhancing the model's predictive accuracy and applicability. Furthermore, the study fully accounts for the influence of confining pressure on rock mechanical behavior, aligning the model more closely with real-world engineering conditions. The results indicate that the model, based on the mineral content, mineral elastic parameters, and pore characteristics within the rock, can quantitatively characterize the macro-scale elastic modulus and rapidly predict both linear and nonlinear deformations, considering the effects of rock damage and confining pressure.

Key words： rock mechanics rock fragments upscaling theory homogenization method strength prediction

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0886 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1527

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