Experimental investigation on mechanical behavior, energy evolution and gas permeability of anisotropic phyllite subjected to triaxial compression and cyclic loading

Duan, Xuelei; Wang, Wei; Liu, Shifan; Cao, Yajun; Zheng, Zhenlong; Zhu, Qi‐Zhi

doi:10.1016/j.gete.2023.100483

Cited by 6 publications

(2 citation statements)

References 50 publications

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“…Researchers lack a unified understanding of the trend in the variation of the elastic modulus of anisotropic rock masses with β. Some scholars [28,31,32] observe that the rock masses' elastic modulus increases with β; others [10,33] note that the elastic modulus of slate varies in a U-shaped pattern with increasing β, akin to the findings from the tests in this study. From a microscopic perspective, this can relate to the mineral composition and the arrangement of microfractures between slate beddings.…”

Section: Elastic Modulus Anisotropysupporting

confidence: 66%

Experimental Study on Mechanical Properties of Anisotropic Slate under Different Water Contents

Yang,

Li,

Zhang

et al. 2024

Applied Sciences

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Slate typically possesses a pronounced layered structure and tends to soften when exposed to water, leading to numerous detrimental effects on the construction of related underground projects. In this study, X-ray diffraction (XRD) analysis was first performed to investigate the mineral composition of the typical slate from Changsha, China. Then, uniaxial and triaxial compression tests under varying bedding angles (i.e., 0°, 30°, 45°, 60°, and 90°) and moisture levels (i.e., dry state, natural state, and saturated state) were conducted to explore the anisotropy characteristics and susceptibility to water-induced softening of the slate. The results reveal that: (1) The exposure of slate to water exacerbates the deterioration of its layered structure, making it more prone to shear failure along the bedding planes. Furthermore, the energy released during shear-slip damage is reduced, which is macroscopically manifested by the decrease in slate brittleness and the increase in plasticity. (2) The slate’s compressive strength, elastic modulus, and cohesion vary in a U-shaped pattern with the increase in bedding angles. However, Poisson’s ratio and internal friction angle are slightly affected by the bedding angle and water content, which do not exhibit a clear variation pattern. (3) In addition, the formulations for strength and stiffness predictions of slate were also discussed in this study. The results show that the modified Hoek–Brown criterion characterizes the uniaxial and triaxial compressive strengths of slate more accurately, and the generalized Hooke’s Law more effectively predicts the elastic modulus.

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Section: Elastic Modulus Anisotropysupporting

confidence: 66%

Experimental Study on Mechanical Properties of Anisotropic Slate under Different Water Contents

Yang,

Li,

Zhang

et al. 2024

Applied Sciences

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“…The stress path also affects the crack propagation process in the construction of the deep gas reservoirs. Duan et al 20 experimentally studied the effects of loading cycles on the energy evolutions of anisotropic phyllite samples under triaxial compression tests. They found that the elastic strain energy and the dissipated strain energy increase with increasing cyclic number, which reflects the crack generation and propagation of microcracks.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Mechanical and Fracturing Behaviors of Shale from Different Gas Blocks in the Longmaxi Formation

Dou,

Hou,

Wang

et al. 2023

ACS Omega

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With the development of shale gas exploration and exploitation, the mechanical and failure characteristics of shale have become one of the focuses. However, few studies have considered the differences in the mechanical properties of shales in different shale gas blocks. In this study, the effects of bedding orientation on the stress–strain curves, elastic modulus, Poisson’s ratio, and fracture morphology of shale samples from the Zhaotong block are analyzed by laboratory experiments, first. Then, a standard deviation method is used to characterize the anisotropy degree of the mechanical and fracturing characteristics of shale. The anisotropy ratio of shale samples between the Zhaotong and Chongqing areas has been comparatively studied. Comparison results show that the shale anisotropy induced by the bedding orientations demonstrates apparent regional characteristics. There are significant differences in the mechanical properties of shale obtained from different shale gas blocks. It indicates that the optimization of engineering practices such as the design of hydraulic fracturing should consider the influences of the bedding orientations and shale gas blocks on the shale anisotropy.

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Dilatancy and Multi-Scale failure characteristics of a foliated rock under triaxial confinement unloading conditions

Zheng,

Kong,

Xiao

et al. 2024

Engineering Failure Analysis

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Experimental investigation on mechanical behavior, energy evolution and gas permeability of anisotropic phyllite subjected to triaxial compression and cyclic loading

Cited by 6 publications

References 50 publications

Experimental Study on Mechanical Properties of Anisotropic Slate under Different Water Contents

Experimental Study on Mechanical Properties of Anisotropic Slate under Different Water Contents

Comparative Study of the Mechanical and Fracturing Behaviors of Shale from Different Gas Blocks in the Longmaxi Formation

Dilatancy and Multi-Scale failure characteristics of a foliated rock under triaxial confinement unloading conditions

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