Dynamic Failure Characteristics of Sandstone Containing Different Angles of Pre-Existing Crack Defects

Hou-You Zhou, Dian-Shu Liu, Zheng-Hua Gao (), En-An Chi, Jun-Ying Rao and Tao Hu
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Hou-You Zhou: School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Dian-Shu Liu: School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
Zheng-Hua Gao: School of Materials and Architectural Engineering (Guizhou School of Emergency Management), Guizhou Normal University, Guiyang 550025, China
En-An Chi: Poly Union Group Co., Ltd., Guiyang 550002, China
Jun-Ying Rao: Research Center of Space Structure, Guizhou University, Guiyang 550025, China
Tao Hu: Guizhou Communications Construction Group Co., Ltd., Guiyang 550081, China

Mathematics, 2024, vol. 12, issue 11, 1-29

Abstract: Fracture within the rock is one of the main factors leading to rock destabilization and has a significant effect on the stability of the project. In this study, sandstone is used as a research target, specimens with crack inclination angles of 0°, 30°, 45°, 60°, and 90° are prefabricated, and the split Hopkinson pressure bar (SHPB) impact test of sandstone with cracks is carried out based on digital image recognition technology to explore the dynamic damage characteristics of the specimens with five angles. The basic mechanical parameters of sandstone are tested to determine the RHT model intrinsic parameters, and the numerical computational RHT model of sandstone containing crack defects is established, which is verified in comparison with the test to analyze the validity of the model. Finally, the failure characteristics of the numerical model under initial stress were carried out. The study shows the following: with the increase in the fracture angle, the dynamic compressive strength and deformation modulus are distributed in a slanting V-shape, and the inclination angle of 45° is the smallest. The strain rate and energy dissipation rate are distributed in a slanting N-shape, and the inclination angle of 45° is the largest. The transmittance shows a decreasing trend, which is the opposite of the reflectivity pattern. The crack angle determines the location and direction of the initial crack, which affects the failure mode. In addition, the parameters of the RHT constitutive model suitable for sandstone are obtained, and the damage and strength patterns of the established RHT model are highly consistent with the laboratory test results. The damage range of numerical models for crack defects with different inclination angles is negatively correlated with confining pressure values and positively correlated with axial pressure values. The damage zones are symmetrically distributed approximately perpendicular to the direction of cracks, and the confining pressure has a contributing role in the peak of the element stresses; however, the axial compression has no contribution in the peak of the element stresses.

Keywords: sandstone; failure mechanism; crack defect; DIC; SHPB; RHT (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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