Strength Characteristics and Failure Mechanism of a Columnar Jointed Rock Mass Under Uniaxial, Triaxial, and True Triaxial Confinement

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

doi:10.1007/s00603-021-02400-7

Cited by 42 publications

(10 citation statements)

References 32 publications

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“…For other types of defective rocks, various relevant studies had also been conducted. Lu et al (2021) proposed that the dip angle had a significant influence on the strength anisotropy of the columnar jointed rock by analysing the failure mode and failure mechanism of the columnar jointed rock under different load conditions. Liu et al (2017) (Lu et al, 2021) studied the influence of the number of cross-fractures, fracture angle, and fracture spacing on the defective rock by PFC3D and revealed the damage and fracture mechanism of the fractured rock under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

“…Lu et al (2021) proposed that the dip angle had a significant influence on the strength anisotropy of the columnar jointed rock by analysing the failure mode and failure mechanism of the columnar jointed rock under different load conditions. Liu et al (2017) (Lu et al, 2021) studied the influence of the number of cross-fractures, fracture angle, and fracture spacing on the defective rock by PFC3D and revealed the damage and fracture mechanism of the fractured rock under uniaxial compression. Asadizadeh et al (2019) (Liu et al, 2017) conducted experiments on artificial fractured rocks with several discontinuous rough fractures under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on mechanical properties of single fracture-hole red sandstone

Ning

Lv²,

Gao³

et al. 2023

Front. Earth Sci.

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Various fractures and holes in the natural rock mass affected the mechanical properties of the rock mass and the safety construction of engineering. In this study, we investigated the mechanical properties of a single fracture-hole rock specimen using particle flow code 2D (PFC2D) numerical simulation software and through laboratory tests. We analysed the failure behaviours and mechanical properties of the rock specimen with a single fracture-hole specimen under different fracture angles. The failure modes of single fractured rock samples with different fracture angles were revealed. The fracture propagation and stress evolution of the rock specimen with a single fracture-hole under different fracture angles were investigated. The experimental results shown that the peak strength, peak strain, elastic modulus, initial fracture stress, and damage stress of the single fracture-hole rock specimen with different fracture angles were significantly less than those of the intact rock specimen. Moreover, fracture hole defects accelerated the generation of fractures and promote the failure of the rock specimen. The failure modes were divided into Y, inverted Y, and V types. Before the rock specimen fractures, the stress concentration area was mainly distributed at both ends of the fracture. The stress concentration area at both ends of the fracture gradually decreased, and the stress concentration area near the hole gradually increased as the fracture angle increased. By experiments, the acoustic emission of the model had gone through three stages: initial, steady growth, and rapid decline. The size of the inclination angle affected the number of acoustic emission hits and the generation of acoustic emission signals. Failure behaviours of the rock specimen with a single fracture-hole were systematically investigated, which could promoted the development of fracture rock mechanics and improved the understanding of instability failure mechanism in rock engineering, such as nuclear wasted treatment engineering and deep underground engineering.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on mechanical properties of single fracture-hole red sandstone

Ning

Lv²,

Gao³

et al. 2023

Front. Earth Sci.

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“…The maximum horizontal, minimum horizontal and vertical components of the initial in situ stress are unbalanced (Wang et al, 2021). As the mining depth increases, the lateral pressure coefficient gradually decreases, and the ratio of horizontal to vertical in situ stresses is 0.5-2.0 (Kang et al, 2010); however, factors such as tectonic movement, topography, faults and joints can change the in situ stress field and alter the deformation and failure law of the rock mass (Lu et al, 2021). Therefore, if the evolution law of stress and the plastic zone of the surrounding rock in different in situ stress fields cannot be studied, prediction and prevention of deep disasters are difficult.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis for tunnelling-induced stress and plastic evolution causing instability of multilayered surrounding rock by varying three-dimensional in situ stresses

Wang,

Feng,

et al. 2023

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PurposeThe induction of geological disasters is predominantly influenced by the dynamic evolution of the stress and plastic zones of the multilayer rock formations surrounding deep-rock roadways, and the behaviours and mechanisms of high in situ stress are key scientific issues related to deep-resource exploitation. The stress environment of deep resources is more complex owing to the influence of several geological factors, such as tectonic movements and landforms. Therefore, in practical engineering, the in situ stress field is in a complex anisotropic three-dimensional state, which may change the deformation and failure law of the surrounding rock. The purpose of this study is to investigate the tunnelling-induced stress and plastic evolution causing instability of multilayered surrounding rock by varying three-dimensional in situ stresses.Design/methodology/approachBased on data from the Yangquan Coal Mine, China, a finite difference model was established, and the elastic-plastic constitutive model and element deletion technology designed in the study were analysed. Gradual tunnelling along the roof and floor of the coal seam was used in the model, which predicted the impact tendency, and compared the results with the impact tendency report to verify the validity of the model. The evolutions of the stress field and plastic zone of the coal roadway in different stress fields were studied by modifying the maximum horizontal in situ stress, minimum horizontal in situ stress and lateral pressure coefficient.FindingsThe results shown that the in situ stress influenced the stress distribution and plastic zone of the surrounding rock. With an increase in the minimum horizontal in situ stress, the vertical in situ stress release area of the roof surrounding rock slowly decreased; the area of vertical in situ stress concentration area of the deep surrounding rock on roadway sides decreased, increased and decreased by turn; the area of roof now-shear failure area first increased and then decreased. With an increase in the lateral pressure coefficient, the area of the horizontal in situ stress release area of the surrounding rock increased; the area of vertical in situ stress release area of the roof and floor surrounding rock first decreased and then increased; the area of deep stress concentration area of roadway sides decreased; and the plastic area of the surrounding rock and the area of now-shear failure first decreased and then increased.Originality/valueThe results obtained in this study are based on actual cases and reveal the evolution law of the disturbing stress and plastic zone of multilayer surrounding rock caused by three-dimensional in situ stress during the excavation of deep rock roadways, which can provide a practical reference for the extraction of deep resources.

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“…Structural planes such as joints, fissures and weak interlayers exist in natural rock masses. The mechanical properties of the structural planes of a rock mass are often the controlling factors for the safety of rock mass engineering [1][2][3] . The total deformation of the structural plane of a rock mass includes not only the deformation of the intact rock mass but also the closure deformation and shear deformation of the structural plane under compression and exhibits different mechanical properties such as elasticity, plasticity and viscosity under external load.…”

Section: Introductionmentioning

confidence: 99%

Experimental and constitutive model study on the mechanical properties of the structural plane of a rock mass under dynamic disturbance

Yang

Liu

et al. 2022

Preprint

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Accurate description of the mechanical properties and deformation characteristics of the structural plane of a large chamber or slope rock mass under the ultimate stress with periodic stress disturbances is of great significance to ensure the stability and safety of underground rock engineering. By theoretically analyzing the strength effect of the structural face of a rock mass under dynamic disturbance, a criterion for the occurrence of shear damage on the structural face of a compressed rock mass under dynamic disturbance is proposed. The results of the cyclic disturbance kinetic test show that there is a disturbance threshold for the shear failure of the structural plane under different disturbance stresses. When the disturbance stress is lower than the disturbance threshold, Cumulative plastic strain stabilizes with increasing number of cycles; when the disturbance stress is higher than the disturbance threshold, S-shaped curve of cumulative plastic strain versus number of cycles. Revealing the progressive damage process and mechanism of rock structure surface under periodic dynamic disturbance. Based on the perturbation concept theory, the relationship between the accumulated plastic strain and the number of cyclic loading is similar to the relationship between strain and time in the creep curve of rocks, a new nonlinear viscous element is proposed, and the nonlinear element and the deformation element considering structural surface closure and sliding are combined with the Burgers model to form an 8-element nonlinear viscoelastic-plastic creep constitutive model. Using the global optimization algorithm of 1stOpt, the model validation and parameter identification are performed on the experimental data, and the results show that the model curve has a very good agreement with the experimental data. The model can accurately reflect the deformation characteristics of the structural plane of a rock mass under periodic dynamic disturbance. The research results give a new idea to analyze power disturbance-induced geohazards.

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Strength Characteristics and Failure Mechanism of a Columnar Jointed Rock Mass Under Uniaxial, Triaxial, and True Triaxial Confinement

Cited by 42 publications

References 32 publications

Experimental study on mechanical properties of single fracture-hole red sandstone

Experimental study on mechanical properties of single fracture-hole red sandstone

Numerical analysis for tunnelling-induced stress and plastic evolution causing instability of multilayered surrounding rock by varying three-dimensional in situ stresses

Experimental and constitutive model study on the mechanical properties of the structural plane of a rock mass under dynamic disturbance

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