Mechanical Properties and Cracking Behavior in Single-Fractured Sandstone under Triaxial Compression

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Mechanical Properties and Cracking Behavior in Single-Fractured Sandstone under Triaxial Compression

Journal Title: GeoStruct Innovations - Year 2024, Vol 2, Issue 1

Abstract

In rock masses, internal defects such as joints, faults, and fractures are pivotal in determining mechanical behavior and structural integrity. This investigation, employing the discrete element numerical simulation technology of GDEM, examines the mechanical attributes of single-fractured sandstone under standard triaxial compression. The study focuses on how fracture inclination angle and confining pressure affect crack propagation within the rock. It is observed that an increase in both fracture inclination angle and confining pressure correlates with a reduction in the tensile stress growth rate near the fracture, indicative of inhibited crack propagation. A notable transition in the failure mode of the sandstone samples is identified, shifting from tensile-shear to predominantly shear failure. This shift is more pronounced under varying confining pressures: Low confining pressure conditions show a prevalence of tensile-shear damage units in proximity to the fracture, while high confining pressure leads to a dominance of shear damage units. These findings contribute to a deeper understanding of fracture mechanics in rock materials and have significant implications for geological and engineering applications where rock stability is critical.

Authors and Affiliations

Lili Wu, Liming Zhang

Keywords

EP ID EP731959
DOI 10.56578/gsi020101
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