Anisotropic mechanical behaviors of columnar jointed basalt under compression

Jin, Changyu; Li, Shengang; Liu, Jianpo

doi:10.1007/s10064-016-0942-y

Cited by 46 publications

(15 citation statements)

References 8 publications

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“…The statistical results demonstrate that the quadrangular, pentagonal and hexagonal columns account for 32.1, 46.7 and 17.6% of the total data, respectively [1]. The diameters of columns are mainly in the range of 13-25 cm, and the aspect ratios are in the range of 2-5 [17]. Previous studies on the CJRM were mainly based on the regular 4P-and 6P-CJRM models shown in Figure 2a,b [16,23].…”

Section: Structural Characteristics Of the Cjrmmentioning

confidence: 80%

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Model Test Study on the Anisotropic Characteristics of Columnar Jointed Rock Mass

et al. 2020

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Because of its special structure, the anisotropic properties of columnar jointed rock mass (CJRM) are complicated, which brings difficulty to engineering construction. To comprehensively study the anisotropic characteristics of CJRM, uniaxial compression tests were conducted on artificial CJRM specimens. Quadrangular, pentagonal and hexagonal prism CJRM models were introduced, and the dip direction of the columnar joints was considered. Based on the test results and the structural features of the three CJRM models, the deformation and strength characteristics of CJRM specimens were analyzed and compared. The failure modes and mechanisms of artificial specimens with different dip directions were summarized in accordance with the failure processes and final appearances. Subsequently, the anisotropic degrees of the three CJRM models in the horizontal plane were classified, and their anisotropic characteristics were described. Finally, a simple empirical expression was adopted to estimate the strength and deformation of the CJRM, and the derived equations were used in the Baihetan Hydropower Station project. The calculated values are in good agreement with the existing research results, which reflects the engineering application value of the derived empirical equations.

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Section: Structural Characteristics Of the Cjrmmentioning

confidence: 80%

“…Ji [16] carried out uniaxial compression tests on artificial 6P-CJRM specimens with various dip angles and proposed an empirical equation to estimate the strength and deformation of CJRM. Jin [17] simulated the quadrangular prism CJRM (4P-CJRM) and described the anisotropic mechanical behavior of CJRM under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Model Test Study on the Anisotropic Characteristics of Columnar Jointed Rock Mass

et al. 2020

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“…For laboratory tests, the existing research usually generalizes the columnar structure into polygonal prisms and columnar joints into straight joints. By making a columnar mould, Jin et al [8] studied the variation of different mechanical parameters and failure characteristics by using reconstructed CJRM specimens. For numerical simulation, Santarsieroet al [9] proposed an original model of Abaqus to simulate the failure of brittle material, such as glasses and concrete.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Anisotropy and Failure Characteristics of Columnar Jointed Rock Masses (CJRM) in Baihetan Hydropower Station: Structural Considerations Based on Digital Image Processing Technology

et al. 2019

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The columnar joints in Baihetan hydropower station are primary tensile joints since they were formed during the process of lava condensation. Understanding the influence of columnar jointed rock mass (CJRM) on the mechanical response and failure modes is the basis for designing of associated engineering works. Hence, the structural characteristics of Baihetan CJRM were analyzed by carrying out a geological survey at first. Three groups of numerical models capable of reflecting the structural characteristics of CJRM were then established to analyze the mechanical and failure characteristics. The results in this study showed that: (1) Irregularity of columnar basalt restricted crack propagation on columnar joints and also led to stress concentration in the distorted parts, and thus, damage of basalt columns; (2) when the included angle between direction of concentrated defect structures in CJRM and uniaxial stress was large, the defect structures can prevent crack propagation on columnar joints, and the failure of defect structure can cause the overall failure of the rock mass; and (3) under the condition of same columnar structure and included angle, the peak strength of models with microcracks and structural plane was low and the irregular shape of columnar joints decreased the anisotropy of mechanical parameters.

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“…Jin et al [179] used 3DEC software to simulate the anisotropic mechanical behaviors of columnar jointed basalt under compression ( Figure 32). e results show that, with different primary joint angles, the jointed specimen exhibits different mechanical properties under the presence of confining pressure.…”

mentioning

confidence: 99%

“…Advances in Civil Engineering 0°15°30°45°6 0°75°90°F igure 32: 3DEC models of columnar jointed basalt with different joint dip angles [179].…”

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confidence: 99%

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

Cao

Lin

Fan

et al. 2019

Advances in Civil Engineering

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Rock masses are heterogeneous materials containing a large number of discontinuities, and the failure of the natural rock mass is induced by the crack propagation and coalescence of discontinuities, especially for the rock mass around tunnel or underground space. Because the deformation or failure process of jointed rock mass exhibits strongly nonlinear characteristics, it is also very difficult to predict the strength and failure modes of the rock mass. Therefore, it is very necessary to study the failure mechanisms of jointed rock mass under different stress conditions. Apart from the stress condition, the discontinuities geometry also has a significant influence on the mechanical behavior of jointed rock mass. Then, substantial, experimental, and numerical efforts have been devoted to the study of crack initiation, propagation, and coalescence of rock or rock-like specimens containing different kinds of joints or fissures. The purpose of this review is to discuss the development and the contribution of the experiment test and numerical simulation in failure behavior of jointed rock or rock-like specimens. Overall, this review can be classified into three parts. It begins by briefly explaining the significance of studying these topics. Afterwards, the experimental and numerical studies on the strength, deformation, and failure characteristics of jointed rock or rock-like materials are carried out and discussed.

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Anisotropic mechanical behaviors of columnar jointed basalt under compression

Cited by 46 publications

References 8 publications

Model Test Study on the Anisotropic Characteristics of Columnar Jointed Rock Mass

Model Test Study on the Anisotropic Characteristics of Columnar Jointed Rock Mass

Mechanical Anisotropy and Failure Characteristics of Columnar Jointed Rock Masses (CJRM) in Baihetan Hydropower Station: Structural Considerations Based on Digital Image Processing Technology

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

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