Stress-dependent anisotropy index of strength and deformability of jointed rock mass: insights from a numerical study

Wu, Na; Liang, Zheng Zhao; Li, Yingchun; Li, Hong; Li, Wan-run; Zhang, Meili

doi:10.1007/s10064-019-01483-5

Cited by 35 publications

(11 citation statements)

References 52 publications

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“…Cui et al (2015) discussed the influence of the structural effect, the distance ratio of joints, joint stiffness, column irregularity on the EDM of specimens, but the shape effect was not further considered. Wu et al (2019) studied the anisotropy of jointed rock masses subjected to confining pressure, but the shape effect needed to be further studied because of the mutual influence.…”

Section: Analysis Of Shape Effect Of Cjbs With Transverse Jointsmentioning

confidence: 99%

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

2022

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We studied the non-linear mechanical response and failure mechanism of columnar jointed basalts (CJBs) with transverse joints by modeling meso-mechanics, statistical damage theory and continuum mechanics. The anisotropy and shape effect of CJBs with transverse joints were captured under different lateral pressures. The digital images were transformed into heterogeneous element meshes, and the gradual fracturing process and various failure modes of CJBs were reproduced. The compressive strength (CS) and equivalent deformation modulus (EDM) of CJBs parallel and perpendicular to the column axis were studied. The results show that the U-shaped CS curve of CJB appears as the column dip angle increases, and the CS is obviously improved as the lateral pressure increases when the column dip angle is 0°–90°. When the shape of CJB changes from 6 m × 3 m, 3 m × 3 m to 1.5 m × 3 m, the CS continues to increase. Meanwhile, the transverse joints are proven to be critical for determining the mechanical properties of CJBs at the certain dip angles of columns. However, the high lateral pressure can reduce the CS difference between the CJBs with and without the transverse joints. Besides, as the elastic modulus of joints rises, the CS will grow up, and the EDM will increase first and then almost remain at the same level. The coefficient of rock residual strength has a great influence on the CS at the certain dip angles of columns. Additionally, the model boundary significantly affects the anisotropy and shape effect of mechanical properties of CJBs under compression. These conclusions will improve our knowledge of the failure mechanisms and failure patterns of CJBs containing transverse joints.

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Section: Analysis Of Shape Effect Of Cjbs With Transverse Jointsmentioning

confidence: 99%

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

2022

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“…As shown in the negative half of the axis of Figure 1, there are three kinds of elements determined by the damage variable, namely, elastic elements (D = 0), damaged elements (0 < D < 1), and complete failure elements (D = 1). Under multiaxial stress states, we can express the parameter D of an element as [31][32][33]:…”

Section: Brief Description Of Rfpa3dmentioning

confidence: 99%

Numerical Simulation Study of Brittle Rock Materials from Micro to Macro Scales Using Digital Image Processing and Parallel Computing

et al. 2022

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The multi-scale, high-resolution and accurate structural modeling of rocks is a powerful means to reveal the complex failure mechanisms of rocks and evaluate rock engineering safety. Due to the non-uniformity and opacity of rocks, describing their internal microstructure, mesostructure and macro joints accurately, and how to model their progressive fracture process, is a significant challenge. This paper aims to build a numerical method that can take into account real spatial structures of rocks and be applied to the study of crack propagation and failure in different scales of rocks. By combining the failure process analysis (RFPA) simulator with digital image processing technology, large-scale finite element models of multi-scale rocks, considering microstructure, mesostructure, and macro joints, were created to study mechanical and fracture behaviors on a cloud computing platform. The Windows-Linux interactive method was used for digital image processing and parallel computing. The simulation results show that the combination of a parallel RFPA solver and digital image modeling technology can achieve high-resolution structural modeling and high-efficiency calculation. In microscopic simulations, the influence of shale fractures and mineral spatial distribution on the fracture formation process can be revealed. In the mesostructure simulation, it can be seen that the spatial distribution of minerals has an impact on the splitting mode of the Brazilian splitting model. In the simulation of a joined rock mass, the progressive failure process can be effectively simulated. According to the results, it seems that the finite element parallel computing simulation method based on digital images can simulate the multi-scale failure process of brittle materials from micro to macro scales. Primarily, efficient parallel computing based on a cloud platform allows for the multi-scale, high-resolution and realistic modeling and analysis of rock materials.

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“…However, joints and other forms of structures such as chambers and tunnels are often present in rock masses (He and Kusiak, 2018;Zhou et al, 2021). The interaction of joints with these structures has a significant impact on the stability of the rock mass (Zhang et al, 2005;Guo et al, 2008;Wu et al, 2019;Li et al, 2022;Wu et al, 2022). Wang et al (2013) used the dynamic finite element method based on damage mechanics to simulate and analyze the crack propagation process and acoustic emission characteristics of a rock mass with multiple circular holes under the action of the stress wave.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of stress wave propagation in joint rock specimens with cavity defects

Yao

et al. 2022

Front. Earth Sci.

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The process of crack initiation, propagation, and coalescence is the essential cause of rock failure. A three-dimensional numerical model based on microscopic damage mechanics is adopted to simulate the failure process and acoustic emissions (AEs) of a jointed rock mass containing a pre-existing hole subjected to stress waves. The numerically simulated results demonstrate that transmission energy plays an important role in the failure process of specimens. The greater the energy of joint transmission is, the greater the damage to the joint transmission area of the rock mass is. Furthermore, the joint width could significantly influence crack propagation patterns and the damage of the joint transmission area of rock specimens. Moreover, the degree of damage to the local joint transmission area of the rock mass is small but then becomes more obvious when the joint angle grows larger. In addition, the wavelength of the stress wave can also affect the failure modes of the rock when stress waves are applied. As the wavelength of the stress wave reduces, the larger the damage of the rock mass is and the smaller the effect of the joint on crack propagation is. Finally, the numerical results demonstrate that the width of the specimen has a significant effect on its dynamic failure mode and degree, showing an obvious size effect. This finding could explain the lateral growth of an existing flaw in its own plane, which is a phenomenon that has not been observed in laboratory experiments.

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Stress-dependent anisotropy index of strength and deformability of jointed rock mass: insights from a numerical study

Cited by 35 publications

References 52 publications

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

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

Numerical Simulation Study of Brittle Rock Materials from Micro to Macro Scales Using Digital Image Processing and Parallel Computing

Numerical simulation of stress wave propagation in joint rock specimens with cavity defects

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