An improved elastoplastic model for rocks and application to cyclic loading and unloading triaxial compression tests

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Acta Mechanica Sinica Pub Date : 2024-06-25 DOI:10.1007/s10409-024-24053-x
Qiuxin Gu  (, ), Qiang Zhang  (, ), Yapeng Li  (, ), Peinan Wu  (, ), Guilei Han  (, )
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Abstract

The recoverable strain of rock is completely classified as elastic strain in the conventional elastic-plastic theory, which often results in poor agreement between theoretical and experimental curves. This work proposes an improved elastoplastic model of rock materials considering the evolutions of crack deformation and elastic modulus to better characterize the nonlinear mechanical behavior of rock in the post-peak stage. In this model, the recoverable strain is assumed to be a combination of elastic and crack strain, and the constitutive relationship between crack strain and rock stress is deduced. Based on the proposed assumption, the evolutions of the mechanical parameters including strength parameters, elastic, plastic, and crack deformation parameters versus the plastic strain and confining stress were investigated. The developed elastoplastic model was validated by comparing the theoretical values with the results of the triaxial cyclic loading and unloading test. The theoretical calculation results show a good agreement with the laboratory test, which indicates that the improved elastoplastic model can effectively reflect the nonlinear mechanical behavior of the rock materials. The research results are expected to provide a valuable reference for further understanding the evolution of rock crack deformation.

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改进的岩石弹塑性模型及其在循环加载和卸载三轴压缩试验中的应用
在传统的弹塑性理论中,岩石的可恢复应变完全被归类为弹性应变,这往往导致理论曲线与实验曲线之间的一致性较差。本研究提出了一种考虑裂缝变形和弹性模量演变的改进型岩石材料弹塑性模型,以更好地描述后峰值阶段岩石的非线性力学行为。在该模型中,可恢复应变被假定为弹性应变和裂缝应变的组合,并推导出裂缝应变和岩石应力之间的构成关系。根据提出的假设,研究了力学参数(包括强度参数、弹性、塑性和裂缝变形参数)随塑性应变和约束应力的变化。通过将理论值与三轴循环加载和卸载试验的结果进行比较,验证了所开发的弹塑性模型。理论计算结果与实验室试验结果吻合良好,这表明改进后的弹塑性模型能有效反映岩石材料的非线性力学行为。研究成果有望为进一步了解岩石裂缝变形的演变过程提供有价值的参考。
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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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