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A new nonlinear empirical strength criterion for rocks under conventional triaxial compression

一种岩石在三轴压缩条件下的非线性经验强度准则

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Abstract

The failure criterion of rocks is a critical factor involved in reliability design and stability analysis of geotechnical engineering. In order to accurately evaluate the triaxial compressive strength of rocks under different confining pressures, a nonlinear empirical strength criterion based on Mohr-Coulomb criterion was proposed in this paper. Through the analysis of triaxial test strength of 11 types of rock materials, the feasibility and validity of proposed criterion was discussed. For a further verification, six typical strength criteria were selected, and the prediction results of each criterion and test results were statistically analyzed. The comparative comparison results show that the prediction results obtained by applying this new criterion to 97 conventional triaxial compression tests of 11 different rock materials are highly consistent with the experimental data. Statistical analysis was executed to assess the application of the new criterion and other classical criteria in predicting the failure behavior of rock. This proposed empirical criterion provides a new reference and method for the determination of triaxial compressive strength of rock materials.

摘要

岩石的破坏准则是岩土工程可靠性设计和稳定性分析的关键因素。为了准确地评价不同围压条 件下岩石的三轴抗压强度, 本文提出了一种基于莫尔-库仑准则的非线性经验强度准则。通过分析11 种岩石材料三轴试验强度, 探讨了所提出准则的可行性和有效性。为进一步验证, 选取了6 个典型强 度准则, 并对各准则的预测结果和试验结果进行对比分析。对比结果表明, 应用本文提出的准则对11 种不同岩石材料进行97 个常规三轴压缩试验, 预测结果与试验结果高度一致。将本文提出的准则和 其他经典准则在预测岩石破坏行为中的应用效果进行统计分析和评估, 表明本文建立的经验准则可以 为岩石材料三轴抗压强度的确定提供新的参考和方法。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Shi-jie Xie  (谢世杰), Hang Lin  (林杭) & Yi-fan Chen  (陈怡帆)

  2. School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China

    Yi-xian Wang  (汪亦显)

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  1. Shi-jie Xie  (谢世杰)
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  2. Hang Lin  (林杭)
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  3. Yi-fan Chen  (陈怡帆)
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  4. Yi-xian Wang  (汪亦显)
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Correspondence to Hang Lin  (林杭).

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Foundation item

Project(51774322) supported by the National Natural Science Foundation of China; Project(2018JJ2500) supported by Natural Science Foundation of Hunan Province, China; Project(2020JGB135) supported by Degree and Postgraduate Education Reform Project of Central South University, China; Project(2018zzts209) supported by the Fundamental Research Funds for the Central Universities, China

Contributors

The overarching research goals were developed by LIN Hang and XIE Shi-jie, CHEN Yi-fan provided the experiment data, and analyzed the experiment data, WANG Yi-xian analyzed the calculated results. The initial draft of the manuscript was written by XIE Shi-jie and CHEN Yi-fan. All authors replied to reviewers’ comments and revised the final version.

Data availability statement

Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.

Conflict of interest

All the authors state that there is no conflict of interest.

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Xie, Sj., Lin, H., Chen, Yf. et al. A new nonlinear empirical strength criterion for rocks under conventional triaxial compression. J. Cent. South Univ. 28, 1448–1458 (2021). https://doi.org/10.1007/s11771-021-4708-8

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