Strength characterization and uncertainty quantification for intact rock based on the true triaxial test
摘要
The strength property is essential to evaluate the yield and failure behavior of a rock mass in rock engineering. However, the traditional determinative strength criterion cannot account for uncertainty during the characterization of yield and failure behavior. Therefore, this study developed a practical characterization and uncertainty quantification framework to determine the strength property and characterize the uncertainty of the yield mechanism based on optimal technology, uncertainty quantification, and the true triaxial compressive test. A true triaxial compressive test was used to determine the stress state on the yield surface. Optimal technology was used to determine the initial range of the strength property. Uncertainty quantification was employed to characterize the uncertainty in the strength property using test data. The developed framework was illustrated and validated using the collected test data. The obtained strength property was compared with the traditional method, and the corresponding yield behavior was validated and investigated using the test data. The mean value and standard deviation of the uniaxial compressive strength of Dunham rock are 257.03 MPa and 10.51 MPa, respectively. The mean value is almost identical to the test value of 257 MPa. The coefficient of determination R2 is close to 0.99 for the collected rock test. It shows that the developed framework addresses the uncertainty of intact rock with excellent performance. The developed framework provides a scientific and reasonable tool for characterizing the strength property of the intact rock and the associated uncertainty.