Abstract
Abstract In practical rock engineering, it is of considerable significance for the study of mechanical behavior of rock containing flaws. The uniaxial compression failure mechanism of granite containing intersecting two-flaws is investigated through the flat-joint modeling approach. The flat-joint model is introduced briefly, and numerical models of intact granite specimens are established. After that, a series of micro-parameters are confirmed by comparison with the laboratory tests of intact granite specimen. Then uniaxial compression simulations are conducted on granites with intersecting two-flaws. The numerically simulated results show good consistency with laboratory tests, including the strength properties, deformation properties, and failure modes. The strength and deformation characteristics of the granites are dependent on the relative position length. Furthermore, the relationship between the crack evolution process and the stress-strain curves for the specimens is studied concerning the relative position length. Finally, the crack propagation mechanism and cracking type of granite specimens are revealed by analyzing the micro-force field.
Highlights
Rock, as a typical heterogeneous material, usually contains a large number of flaws from the microscopic to macroscopic scale (Lee et al, 2017; Li et al, 2020; Wang et al, 2020; Wu et al, 2020; Yang et al, 2016; Zhou et al, 2014)
Based on the laboratory tests of granite with intersecting two-flaws of relative position length (Yin et al, 2016), we will make a systematic analysis of the granite specimens and make a quantitative comparison between the numerical results and the laboratory tests
It is seen that there are two noticeable stress drops after the peak-strength for p = 30 mm, which is different from the results of laboratory tests
Summary
As a typical heterogeneous material, usually contains a large number of flaws (weak surfaces, faults, fissures, and voids, etc.) from the microscopic to macroscopic scale (Lee et al, 2017; Li et al, 2020; Wang et al, 2020; Wu et al, 2020; Yang et al, 2016; Zhou et al, 2014). Shen et al (1995) conducted several laboratory tests on gypsum specimens containing pre-existing fractures They reported that different fracture geometries produced significantly different stress fields in the rock bridge area, and resulted in various failure modes. Mughieda and Alzo'ubi (2004) investigated the influence of bridge inclination on the failure modes of rock-like materials containing flaws. They observed that wing cracks started to propagate before failure because of the tensile stress concentration. Zhang et al (2019) studied the compressive failure process of rock-like materials containing X-type flaws aligned in the loading direction They revealed that the crack evolution laws and fracture mechanisms of rock mass with X-type flaws. They revealed that the crack evolution laws and fracture mechanisms of rock mass with X-type flaws. Wang et al (2020) investigated the failure behavior of jointed rock mass with various joint density and joint distribution. Chai et al (2020) conducted a series of static and dynamic compression tests on jointed rock samples filled with different filling materials, and revealed the strength characteristics and failure modes of the filled rock joints
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