comparative numerical analysis of indirect tensile strength assessment methods in rock engineering

This study presents an in-depth comparative numerical analysis of three distinct methods employed to evaluate the indirect tensile strength of rock materials: the brazilian tensile test (bt), the three-point bending test (tpbt), and the four-point bending test (fpbt). utilizing advanced simulation capabilities provided by the three-dimensional particle flow code (pfc3d) software, the tensile behavior of rock samples was modeled and assessed under the unique loading conditions associated with each testing approach. the bt method, despite its widespread use and simplicity, revealed several limitations that could affect the reliability of its results. key issues identified include significant stress concentration around the loading points and a non-homogeneous distribution of stress across the sample, which can introduce variability in the tensile strength measurements. in contrast, both the tpbt and fpbt methods demonstrated advantages in terms of loading control and stress distribution. the tpbt provided a more regulated loading condition compared to the bt, yet the fpbt method stood out for offering the most uniform stress distribution across the sample. the comparative analysis revealed notable discrepancies in the tensile strength values obtained from each method. specifically, tensile strength values derived from the tpbt and fpbt were considerably different from those obtained using the bt method, with the fpbt consistently yielding the highest tensile strength measurements. these differences underscore the critical role that test method selection plays in accurately characterizing the tensile strength of rock. overall, the study emphasizes the strengths and limitations of each testing approach, providing insights into the factors that influence tensile strength measurement outcomes. it also highlights the necessity for careful selection of the testing technique based on the specific requirements of rock mechanics analysis, particularly when precision and reliability are paramount. the findings of this research contribute to the ongoing development of more accurate and effective methods for evaluating the tensile strength of rock materials in various engineering and geological applications.

comparative numerical analysis of indirect tensile strength assessment methods in rock engineering

this study presents an in-depth comparative numerical analysis of three distinct methods employed to evaluate the indirect tensile strength of rock materials: the brazilian tensile test (bt), the three-point bending test (tpbt), and the four-point bending test (fpbt). utilizing advanced simulation capabilities provided by the three-dimensional particle flow code (pfc3d) software, the tensile behavior of rock samples was modeled and assessed under the unique loading conditions associated with each testing approach. the novelty of this study lies in the comprehensive comparison of these three methods using pfc3d simulations, which has not been extensively explored in previous research. our findings reveal significant discrepancies in tensile strength values obtained from each method, with the fpbt consistently yielding the highest tensile strength measurements due to its superior stress distribution. the bt method, despite its widespread use and simplicity, revealed several limitations, including significant stress concentration around the loading points and a non-homogeneous distribution of stress across the sample. in contrast, both the tpbt and fpbt methods demonstrated advantages in terms of loading control and stress distribution. the comparative analysis revealed notable discrepancies in the tensile strength values obtained from each method, underscoring the critical role that test method selection plays in accurately characterizing the tensile strength of rock. overall, this study provides new insights into the mechanical behavior of rocks under different testing conditions and offers recommendations for selecting appropriate tensile strength methods based on specific engineering applications. the use of pfc3d simulations to uncover these discrepancies represents a significant advancement in the field, offering a more accurate and reliable approach for evaluating rock tensile strength in various engineering and geological contexts.