(1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. CCTEG Coal Mining Research Institute，Beijing 100013，China；3. Coal Mining and Designing Department，Tiandi Science and Technology Co.，Ltd.，Beijing 100013，China；4. State Key Laboratory of Coal Mining and Clean Utilization，Beijing 100013，China；
5. Coal Industry Taiyuan Design Research Institute Group Co.，Ltd.，Taiyuan，Shanxi 030001，China；6. School of
Safety Science and Engineering，Xinjiang Institute of Engineering，Urumqi，Xinjiang 830023，China；7. Taiyuan
Research Institute Co.，Ltd.，China Coal Technology and Engineering Group，Taiyuan，Shanxi 030006，China)
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.
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2025, Vol. 44 
