基于岩石单轴抗压强度和抗拉强度的非线性Coulomb强度准则

doi:10.3724/1000-6915.jrme.2024.0007

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Abstract The nonlinear Coulomb strength criterion is an extension of the classical Coulomb strength criterion，utilizing the uniaxial(compressive and tensile) strength of intact rocks as fundamental parameters. By employing the rock cohesion function and the internal friction angle function，a new rock strength criterion is established. The core value of this criterion lies in its capacity to calculate the triaxial strength of rocks under various stress states based on the uniaxial strength of intact rocks. This includes the peak strength，cohesive force，and internal friction angle of intact rocks，as well as the damage strength，cohesive force and internal friction angle of intact rocks，and the strength，cohesion，and internal friction angle of rock masses with different quality levels. Simultaneously，the corresponding rock strength curves were determined. A comparative analysis of 14 rock strength test results demonstrates that the theoretical calculations derived from the nonlinear Coulomb strength criterion align closely with the experimental results obtained from the Hoek-Brown empirical strength criterion. The key distinction between the nonlinear Coulomb strength criterion and the Hoek-Brown empirical strength criterion is that the former relies on the uniaxial strength of the rock，while the latter is contingent upon the experimental outcomes of the rock?s triaxial strength. Especially when the number of test samples is limited and only uniaxial strength testing is available，the nonlinear Coulomb strength criterion serves as the sole effective method for determining rock cohesion，internal friction angle，and strength curves.

Key words： rock mechanics nonlinear Coulomb strength criterion Coulomb constant function rock strength

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	Articles by authors
	JIA Xirong1
	LIU Yuedong2
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	LIU Chang2
	3
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	LIU Mingyin5
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	HAN Feng7

Cite this article:

JIA Xirong1,LIU Yuedong2,3, et al. Nonlinear Coulomb strength criterion based on uniaxial compressive and tensile strength of rocks[J]. , 2025, 44(S1): 1-9.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0007 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/1

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