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Evolution of deformation property and strength component mobilization for thermally treated Beishan granite under compression

热处理后北山花岗岩在压缩过程的变形及强度调用演化

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Abstract

The cohesion weakening and friction strengthening (CWFS) model for rock reveals the strength components mobilization process during progressive brittle failure process of rock, which is very helpful in understanding mechanical properties of rock. However, the used incremental cyclic loading-unloading compression test for the determination of strength components is very complicated, which limits the application of CWFS model. In this paper, incremental cyclic loading-unloading compression test was firstly carried out to study the evolution of deformation and the strength properties of Beishan granite after various temperatures treated under different confining pressures. We found the axial and lateral unloading modulus are closely related to the applied stress and damage state of rock. Based on these findings, we can accurately determine the plastic strain during the entire failure process using conventional tri-axial compression test data. Furthermore, a strength component (cohesive and frictional strength) determination method was developed using conventional triaxial compression test. Using this method, we analyzed the variation of strength mobilization and deformation properties of Beishan granite after various temperatures treated. At last, a non-simultaneous strength mobilization model for thermally treated granite was obtained and verified by numerical simulation, which demonstrated the effectiveness of the proposed strength determination method.

摘要

岩石压缩破坏过程的黏聚力强度劣化-摩擦强度调用模型(CWFS)可揭示脆性岩石压缩破坏过程 中2 种强度组分调用过程, 从内在机制上反映了岩石压缩破坏全过程中由于微裂隙产生而导致的粘聚 力强度劣化和摩擦强度的强化的过程。然而, 确定压缩过程粘聚力强度和内摩擦强度需要开展复杂的 三轴循环加卸载, 限制了该模型的广泛应用。本文以北山花岗岩为研究对象, 首先开展了多个围压条 件下(5, 10, 20, 30 MPa)三轴循环加卸载试验和常规三轴试验, 研究不同温度处理后(100, 300, 500, 600, 800 °C)北山花岗岩的变形和强度性质。结果表明岩石的轴向和切向加卸载割线模量与加载应力 密切相关, 并建立卸载割线模量与加载应力的关系, 该关系可用以准确确定岩石常规三轴压缩过程各 应力水平的塑性应变。在此基础上, 提出了通过常规三轴压缩试验数据确定压缩破坏全过程强度组分 调用的方法。应用此方法分析了不同温度处理后花岗岩变形和强度参数调用过程。最后建立了热处理 后花岗岩强度调用模型, 并通过数值模拟验证了该模型的合理性, 同时证实了所提出的基于常规三轴 压缩试验确定岩石压缩过程强度参数调用方法的合理性。

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Authors and Affiliations

  1. College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China

    Shi-wan Chen  (陈世万), Feng Liang  (梁风), Shuang-ying Zuo  (左双英) & Dao-yong Wu  (吴道勇)

  2. Key Laboratory of Karst Geologic Resource and Environment of the Ministry of Education, Guizhou University, Guiyang, 550025, China

    Shi-wan Chen  (陈世万)

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  1. Shi-wan Chen  (陈世万)
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Contributions

CHEN Shi-wan provided the concept, conducted experimental work and edited the draft of manuscript. LIANG Feng, ZUO Shuang-ying and WU Dao-yong edited the draft of manuscript, replied to reviewers’ comments and revised the final version.

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Correspondence to Shi-wan Chen  (陈世万).

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Conflict of interest

CHEN Shi-wan, LIANG Feng, ZUO Shuangying and WU Dao-yong declare that they have no conflict of interest.

Foundation item

Project(41902301) supported by the National Natural Science Foundation of China; Project(20201Y185) supported by the Science and Technology Foundation of Guizhou Province, China; Project(Z018023) supported by the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, IRSM, CAS; Project (201822) supported by the Foundation for Young Talents of Guizhou University, China; Project(2017-5402) supported by the Mountain Geohazard Prevention R&D Center of Guizhou Province, China

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Chen, Sw., Liang, F., Zuo, Sy. et al. Evolution of deformation property and strength component mobilization for thermally treated Beishan granite under compression. J. Cent. South Univ. 28, 219–234 (2021). https://doi.org/10.1007/s11771-021-4598-9

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  • DOI: https://doi.org/10.1007/s11771-021-4598-9

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