Experimental Study on the Strength Failure Characteristics of Columnar Jointed Rock Masses under Three-Dimensional Stress

Zhu, Zhende; Lu, Wenbin; He, Yanxin; Que, Xiangcheng

doi:10.1007/s12205-021-0821-3

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…But in their study, the cement paste was used to bond the columns to simulate the role of joints between the columns, which is different from the actual joints. Zhu et al (2021) performed a group of physical tests to reveal the mechanical behaviors and deformation features of CJRMs subject to the three-dimensional stress. However, the influence of transverse joints and shape effect were not considered.…”

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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“…In the case of plane strain, normal displacement constraints were applied on both sides along the thickness direction of the model. As shown in Figure 15, in the case between plane strain and plane stress and the case of plane strain, with a confining pressure of 4 MPa, the numerical test results in this paper were compared with the laboratory physical test results of Xiao et al (2014) and Zhu et al (2021). Xiao et al (2014) used a mixture of gypsum, cement, and water to make columns according to a mass ratio of 3:1:3.2, then bonded them with cement slurry, cut and polished to obtain cylindrical specimens with a diameter of 50 mm and a height of 100 mm, and carried out a uniaxial compression test.…”

Section: Effects Of Different Model Boundaries and Confining Pressures On The Strength And Deformation Of Jointed Rock Massmentioning

confidence: 99%

“…Cement slurry may have a great constraint on the deformation of jointed rock mass specimens, which may be quite different from the actual mechanical properties of the joints. Zhu et al (2021) studied the mechanical properties and failure characteristics of CJRM specimens under 3D stress through a physical model test. The results showed that, under confining pressure, with the increase of column dip angle, the CSs of the specimens roughly decreased firstly and then changed slowly.…”

Section: Effects Of Different Model Boundaries and Confining Pressures On The Strength And Deformation Of Jointed Rock Massmentioning

confidence: 99%

“…Uniaxial compression tests were carried out and the failure patterns of CJRMs were analyzed. Zhu et al (2021) studied the mechanical properties and failure characteristics of CJRM specimens under 3D stress through physical model tests. Xia et al (2020b) reconstructed irregular CJRMs using 3DP technology and then carried out uniaxial compression tests to analyze the fracture characteristics of irregular CJRMs.…”

Section: Effects Of Different Model Boundaries and Confining Pressures On The Fracture Mechanism Of Jointed Rock Massmentioning

confidence: 99%

“…Furthermore, the AE energy showed a single peak distribution under the plane strain state, and the peak value of AE energy tended to be before the peak stress of the stress-strain curve. Zhu et al (2021) studied the mechanical properties and failure characteristics of CJRM specimens under 3D stress through physical model tests. However, the evolution of the AE energy in the progressive fractured process of CJRMs was not considered in their research.…”

Section: Effects Of Different Model Boundaries and Confining Pressures On The Ae Of Jointed Rock Massmentioning

confidence: 99%

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Numerical Investigation on Fracture Mechanisms and Energy Evolution Characteristics of Columnar Jointed Basalts With Different Model Boundaries and Confining Pressures

2021

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To reveal the mechanical mechanisms and energy release characteristics underlying progressive failure of columnar jointed basalts (CJBs) with various model boundaries and confining pressures, by combining the meso-damage mechanics, statistical strength theory, and continuum mechanics, inhomogeneous CJB models with different dip angles to the column axis are constructed. In the cases of plane stress, plane strain, and between plane stress and plane strain, the gradual fracture processes of CJBs are simulated under different confining pressures and the acoustic emission (AE) rules are obtained. The results show that: 1) in the case of plane stress, the fracture process of CJBs along direction I orthogonal to the column axis: at the initial stage of loading, the vertical joints and the transverse joints in the CJB specimen are damaged. Then, more columns in the upper middle part are cracked; 2) in the case between plane stress and plane strain, the fracture process of CJBs along the direction parallel to the column axis: at the initial stage of loading, the columnar joints are damaged. Then, the area of the damaged and broken columns at the top of the specimen increases and the crushing degree intensifies; 3) for the case between plane stress and plane strain, the AE energy accumulation before the peak stress is higher than the plane strain state along the direction orthogonal to the column axis. Meanwhile, along the direction parallel to the column axis, this value becomes larger when changing from the state between plane stress and plane strain to the plane strain state. These achievements will certainly improve our understanding of the fracture mechanism and energy evolution of CJBs and provide valuable insights into the instability precursor of CJBs.

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Laboratory test and numerical simulations for 3D printed irregular columnar jointed rock masses under biaxial compression

Zhao

Xia

Zhang

et al. 2022

Bull Eng Geol Environ

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Experimental Study on the Strength Failure Characteristics of Columnar Jointed Rock Masses under Three-Dimensional Stress

Cited by 14 publications

References 36 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 Investigation on Fracture Mechanisms and Energy Evolution Characteristics of Columnar Jointed Basalts With Different Model Boundaries and Confining Pressures

Laboratory test and numerical simulations for 3D printed irregular columnar jointed rock masses under biaxial compression

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