Numerical Investigation on Anisotropy and Shape Effect of Mechanical Properties of Columnar Jointed Basalts Containing Transverse Joints

Wang, Yong-Yi; Gong, Bin; Tang, Chun’an

doi:10.1007/s00603-022-03018-z

Cited by 27 publications

(12 citation statements)

References 37 publications

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“…where σ 1 , σ 3 , ϕ and f c represents the major principal stress, minor principal stress, internal friction angle and uniaxial compressive strength, respectively. The damage-induced degeneration of element parameter can be computed according to Wang et al (2022) [28].…”

Section: Damage and Failure Of One Meso-elementmentioning

confidence: 99%

Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

et al. 2022

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The progressive collapse behavior and energy release of columnar jointed basalts (CJBs) can be greatly influenced by different joint distance ratios. By adopting the digital image correlation, a series of heterogeneous CJB models are established. The continuous fracture process and acoustic emissions (AEs) are captured numerically under varying lateral pressures. The load curves under different joint distance ratios and model boundaries are analyzed. Meanwhile, the strength, deformation modulus and AE rule are discussed. The data indicate that under plane strain, the troughs of compression strength appear at the column dip angle β = 30°, 150°, 210° or 330°; the equivalent deformation modulus changes in an elliptical way with β increasing; the compression strength and equivalent deformation modulus are higher than the case between plane stress and plane strain under different joint distance ratios. When β = 30°, the accumulation of AE energy corresponding to the stress peak under plane strain are higher than the case between plane stress and plane strain but becomes lower when β increases to 60°, which implies the critical transformation of the AE energy-related failure precursor affected by column dip angle. These achievements will contribute to the design, construction and support of slopes and tunnels encountering CJBs.

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Section: Damage and Failure Of One Meso-elementmentioning

confidence: 99%

Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

et al. 2022

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“…Considering that the shales, as a kind of heterogeneous materials, contain various granular media, holes, micro-cracks and other defects, their mechanical behaviours are closely related to the inner meso-structure, such as stress distribution, crack propagation, damage evolution and failure mode. The DIP-enhanced RFPA can effectively characterize the mesoscopic structure of the heterogeneous shales by processing digital image (Wang et al 2021(Wang et al , 2022b. Clearly, the grey value distribution of the image was analyzed, and the finite element mesh was divided using the pixels.…”

Section: Principal Of Numerical Proceduresmentioning

confidence: 99%

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

Feng

Gong

Cheng

et al. 2022

Geomatics, Natural Hazards and Risk

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The dynamic anisotropy and failure mechanism of shales are greatly affected by bedding surfaces. To reveal the influence of beddings on anisotropic characteristics of shales under dynamic impact, the Brazilian splitting tests were conducted by the split Hopkinson pressure bar system. The fracturing process were monitored by the high-speed camera. Meanwhile, to understand crack initiation and propagation mechanism, the stress buildup, stress shadow and stress transfer were modelled based on the digital image processing and the rock failure process analysis method. The effect of dip angle and bedding spacing on crack initiation, propagation and coalescence was analyzed. Simultaneously, the spatial distribution and energy magnitude of crack-induced acoustic emissions were captured numerically. The results show that the shale discs continue to produce parallel cracks and cambered cracks induced by the high stresses at the tips of initial cracks; the tensile strength under dynamic splitting changes in the U-shaped trend with the bedding dip angle increasing; the cracking percentage of bedding surfaces decreases, and the cracking percentage of rock matrix increases with the bedding dip angle increasing. In addition, the acceleration of crack growth and the rapid growth of AE energy can be regarded as the effective precursors of shale failure.

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“…Many engineering practices have shown that rock joint shear slip is one of the key causes of rock mass engineering instability [ 3 , 4 ]. Full-length bolted support can effectively control shear slip deformation of the rock mass to realize stability control of rock mass, which has become one of the most widely used means in rock mass engineering reinforcement [ 5 , 6 , 7 , 8 , 9 , 10 ]. However, with increasingly complex engineering conditions, the failure of bolted support induced by rock joint shear slip becomes increasingly prominent.…”

Section: Introductionmentioning

confidence: 99%

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

Jiang

Liu

et al. 2023

Materials

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Anisotropic discontinuity exists widely in rock masses of mines, tunnels, slopes, water conservancy and hydropower projects. The shear characteristics of bolted anisotropic rock joints are extremely important for the stability design of engineering rock mass. However, few scholars have studied the bolted anisotropic rock joint. The different rock properties on both sides of the rock joint, especially the different rock strengths, will greatly affect the deformation characteristics and failure mode of the rock mass. Based on this, a series of shear tests were carried out on the bolted anisotropic rock joint under different normal stresses, and the characteristics of shear stress–shear displacement curve, shear strength, failure characteristics of the rock joint and deformation characteristics of the bolt are discussed. λ is defined as the strength ratio of upper and lower rock on the structural surface. The results show that the effect of λ on the shear stress–shear displacement curve is not obvious at the pre-fracture stage. The shear stress–shear displacement curve at the pre-breaking stage of the bolt presents a softening stage when the normal stress is equal to 0.5 MPa, tends to be horizontal when the normal stress is equal to 1 MPa and presents a hardening stage when the normal stress is greater than 1 MPa. After the bolt is broken, the shear stress–shear displacement curve presents a stepped-down descent. With the increase in λ, the breaking shear stress of the bolt increases. Elliptic failure occurs on the surface of the bolted anisotropic rock joint, and the length of the major axis of the ellipse decreases with the increase in λ value and normal stress. The bolts with different λ values of anisotropic rock joint show “Z-shaped” tensile bending deformation characteristics after shear fracture, and the horizontal and vertical components of the bolt deformation decrease with the increase in λ value and normal stress. The fracture shear displacement of the bolt increases with the increase in normal stress and decreases with the increase in λ value. The research results are helpful to further understand the shear mechanical characteristics and differences of bolted rock joints and provide a reference for solving the engineering problems of the composite layered rock mass.

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Numerical Investigation on Anisotropy and Shape Effect of Mechanical Properties of Columnar Jointed Basalts Containing Transverse Joints

Cited by 27 publications

References 37 publications

Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

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