Abstract
The dynamic compression properties of transversely isotropic rocks and their dependence on the confining pressure and bedding directivity are important in deep underground engineering activities. In this study, a slate is characterized using a split Hopkinson pressure bar (SHPB) test. Five groups of samples with preferred bedding directions (dip angles of 0°, 30°, 45°, 60°, and 90°) are subjected to coupled axial impact loading (low, medium, and high) under confining pressure (0, 5, and 10 MPa). The failure mode, dynamic strength, and Young’s modulus are investigated. The test results show that the tensile splitting effect is significant when there is no confining pressure. However, under a confining pressure (5 and 10 MPa) condition, the cracks that develop along the loading direction can be significantly constrained and the samples are forced to fail along the bedding plane. With increasing confining pressure, the critical dynamic strength significantly increases, and Young’s modulus increases when θ ≥ 45° while it decreases when θ ≤ 30°.
Highlights
Isotropic rocks, which are widely distributed on the surface of the earth, are a specific form of anisotropic rock
Most of the previous research has focused on the static state of stress. Many engineering applications, such as blasting and drilling, expose rocks to dynamic loading, potentially inducing underground engineering accidents such as collapse, roof fall, rock burst, and gush events. erefore, understanding the properties of rocks under dynamic loading is important for engineers to optimize design and construction
We aim to investigate the effect of confining pressure on the failure mode and dynamic compression properties of transversely isotropic rocks. e bedding directivity is of interest; five groups of samples (θ 0°, 30°, 45°, 60°, and 90°) were tested using an split Hopkinson pressure bar (SHPB) at three load levels and three confining pressures (0 MPa, 5 MPa, and 10 MPa)
Summary
Isotropic rocks, which are widely distributed on the surface of the earth, are a specific form of anisotropic rock. Multiple blasting engineering observations and laboratory experiments have indicated that properties such as transmission of the impact wave and the effect of blasting and rock fragmentation differ between triaxial and uniaxial pressure [16]. Christensen et al [16] was the first to test rock with confining pressure and dynamic loading [17]. We aim to investigate the effect of confining pressure on the failure mode and dynamic compression properties of transversely isotropic rocks. E bedding directivity is of interest; five groups of samples (θ 0°, 30°, 45°, 60°, and 90°) were tested using an SHPB at three load levels (low, medium, and high) and three confining pressures (0 MPa, 5 MPa, and 10 MPa). To ensure that at least 3 results could be obtained per loading level and confining pressure, 150 rock samples were prepared at five dip angles.
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