Experimental study on the mechanical properties of simulated columnar jointed rock masses

Xiao, Weimin; Deng, Ran; Zhong, Zhibin; Xiao-min, FU; Wang, Cong-yan

doi:10.1088/1742-2132/12/1/80

Cited by 41 publications

(12 citation statements)

References 30 publications

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“…The typical stress-strain curves for the three types of artificial CJRM specimens with different dip directions are shown in Figure 6. According to the approximate straight line between 20 and 80% of the peak strength in the stress-strain curve, the elastic modulus E cj was calculated by the following equation [15]:…”

Section: Deformation and Strength Behaviormentioning

confidence: 99%

“…• . In addition, this form of Equation (8) can also be used to estimate the elastic modulus of the jointed rock mass [15]. Therefore, this simple empirical expression was introduced in this study to predict the strength and deformation of the CJRM.…”

Section: Theoretical Prediction Of Strength and Deformationmentioning

confidence: 99%

“…Li [13] conducted several direct shear tests on the specimens with different dip angles to investigate the anisotropy of closely jointed rock masses. For the CJRM, Xiao [15] used a mixture of plaster, cement and water to simulate the hexagonal prism CJRM (6P-CJRM), and studied the effects of the dip angle of columns on the mechanical properties of CJRM. 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.…”

Section: Introductionmentioning

confidence: 99%

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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: Deformation and Strength Behaviormentioning

confidence: 99%

Section: Theoretical Prediction Of Strength and Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Also, specimens with different dip angles can be obtained easily, and the anisotropic permeability of CJRM can be obtained effortlessly by measuring the permeability of CJRM with different columnar dip angles [6]. Additionally, the rock-like analogue model materials of CJRM have been adopted by some scholars to research the mechanical properties of CJRM [27]. It has been proved that rock-like analogue model materials can simulate CJRM, and physical model tests are an effective way to explore the characteristics of CJRM.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Anisotropic Permeability and Porosity of CJRM considering Different Confinement Loading Pressures

Chao

et al. 2020

Advances in Civil Engineering

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An innovative method is proposed to prepare artificial columnar jointed rock masses (CJRM) with different columnar dip angles, and laboratory physical model tests are conducted to investigate anisotropic permeability and porosity characteristics of the prepared artificial CJRM. In the physical model experiment, permeability and porosity of artificial CJRM with different columnar dip angles is measured during three times cyclic loading and unloading of confinement pressure. Based on the results of the laboratory model tests, the Equivalent Continuum Media Model was applied to analyse anisotropic permeability of CJRM. The main conclusions are summarized as follows. In the first loading phase of confinement pressure, the impacts of confinement pressure on the anisotropic permeability of artificial CJRM, porosity, and the major and minor principle permeability coefficients (PPCs) are significant, while in the following stages of confinement pressure loading and unloading, the change of them is small, with stable value. Permeability of artificial CJRM gradually increases with rise of columnar dip angle, and the permeability anisotropy of artificial CJRM under low confinement pressure is higher than that under low confinement pressure.

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“…Based on meso-structural analysis, macro-anisotropic constitutive model is developed and 3-D numerical simulation is performed for the dam foundation considering the effect of columnar joints [18]. Laboratory tests are carried out using experimental analogs of jointing under uniaxial compression [19]. These research results indicate that the characteristics of columnar jointed rock mass are very complex with anisotropic and nonlinear properties.…”

Section: Introductionmentioning

confidence: 99%

Generation of Numerical Models of Anisotropic Columnar Jointed Rock Mass Using Modified Centroidal Voronoi Diagrams

et al. 2018

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A columnar joint network is a natural fracture pattern with high symmetry, which leads to the anisotropy mechanical property of columnar basalt. For a better understanding the mechanical behavior, a novel modeling method for columnar jointed rock mass through field investigation is proposed in this paper. Natural columnar jointed networks lies between random and centroidal Voronoi tessellations. This heterogeneity of columnar cells in shape and area can be represented using the coefficient of variation, which can be easily estimated. Using the bisection method, a modified Lloyd’s algorithm is proposed to generate a Voronoi diagram with a specified coefficient of variation. Modelling of the columnar jointed rock mass using six parameters is then presented. A case study of columnar basalt at Baihetan Dam is performed to demonstrate the feasibility of this method. The results show that this method is applicable in the modeling of columnar jointed rock mass as well as similar polycrystalline materials.

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Experimental study on the mechanical properties of simulated columnar jointed rock masses

Cited by 41 publications

References 30 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

Investigation of Anisotropic Permeability and Porosity of CJRM considering Different Confinement Loading Pressures

Generation of Numerical Models of Anisotropic Columnar Jointed Rock Mass Using Modified Centroidal Voronoi Diagrams

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