Study on the Strength Characteristics of Columnar Jointed Basalt with a True Triaxial Apparatus at the Baihetan Hydropower Station

Shi, Anchi; Wei, Yufeng; Zhang, Yihu; Tang, Mingfa

doi:10.1007/s00603-020-02195-z

Cited by 26 publications

(10 citation statements)

References 20 publications

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“…The digital figures were used for creating the numerical samples as displayed in Table 1. The parameter values of the finite element models were determined according to the literatures [8][9][10][11][12][13][16][17][18][19] and presented in Table 2. The displacement load with a ratio of 0.005 mm/step was used until the model failure.…”

Section: Modeling Effectivenessmentioning

confidence: 99%

“…The selection of parameters can affect the elastic moduli and compression strengths [30]. According to the corresponding literatures [8][9][10][11][12][13][16][17][18][19], the mechanical parameter values of rock and joint of CJBs are determined (see Table 2).…”

Section: Numerical Investigationmentioning

confidence: 99%

“…Through a series of compression exper under uniaxial stress state, Ke et al [11] analyzed the anisotropy induced by tran joints. Shi et al [12] presented an approach to obtain the strengths using the Moh lomb and Hoek-Brown criteria under triaxial stresses. A group of laboratory tes carried out by Jin et al [4] for understanding the anisotropic parameters of CJR analyze the actual geological structures on site, the uniaxial testing was carried o et al [13].…”

Section: Introductionmentioning

confidence: 99%

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Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

et al. 2022

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The progressive collapse behavior and energy release of columnar jointed basalts (CJBs) can be greatly influenced by different joint distance ratios. By adopting the digital image correlation, a series of heterogeneous CJB models are established. The continuous fracture process and acoustic emissions (AEs) are captured numerically under varying lateral pressures. The load curves under different joint distance ratios and model boundaries are analyzed. Meanwhile, the strength, deformation modulus and AE rule are discussed. The data indicate that under plane strain, the troughs of compression strength appear at the column dip angle β = 30°, 150°, 210° or 330°; the equivalent deformation modulus changes in an elliptical way with β increasing; the compression strength and equivalent deformation modulus are higher than the case between plane stress and plane strain under different joint distance ratios. When β = 30°, the accumulation of AE energy corresponding to the stress peak under plane strain are higher than the case between plane stress and plane strain but becomes lower when β increases to 60°, which implies the critical transformation of the AE energy-related failure precursor affected by column dip angle. These achievements will contribute to the design, construction and support of slopes and tunnels encountering CJBs.

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Section: Modeling Effectivenessmentioning

confidence: 99%

Section: Numerical Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

et al. 2022

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“…discovered that increased σ 2 leads to higher rock strength, while crack initiation stress (σ ci ) under true triaxial stress first increases and then decreases. Concurrently, other researchers have also conducted true triaxial compression experiments on foliated phylite and jointed marble, respectively. − The strength of these fractured rocks exhibits a σ 2 effect similar to that of intact rocks.…”

Section: Introductionmentioning

confidence: 98%

Experimental Study on the Response of Cracked Sandstone to the Intermediate Principal Stress Coupled with Pore Pressure

Liang,

Huang,

Zheng

et al. 2024

ACS Omega

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Underground fractured rock masses are susceptible to failure under the combined influence of true triaxial stresses and pore pressure, posing severe threats to personnel and production safety of underground engineering. To investigate the influence of intermediate principal stress (σ 2 ) on the mechanical and water diffusion volume change (ΔV) characteristics during the failure process of cracked rocks under stable pore pressure, this study conducted true triaxial strength experiments on cracked sandstone with stable pore pressure. The results demonstrated that with the increase of σ 2 , crack initiation stress (σ ci ), crack damage stress (σ cd ) and the peak stress (σ 1,peak ) of cracked sandstone initially increase and then decrease. Conversely, ΔV tends to decrease first and then increase with the increase of σ 2 . This inverse relationship indicates that under elevated σ 2 , the decreased strength of cracked rock could lead to an increase in ΔV, which may increase the probability of water inrush disasters. The findings of this study provide a theoretical reference for the stability of rock mass engineering and the prevention of water inrush disasters.

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“…Over the past years, substantial efforts have been carried out to understand the engineering geological characteristics, physical and mechanical characteristics of CJRM and its influence on engineering characteristics by means of engineering geological investigation, in-situ test, laboratory test and numerical simulation. Based field true triaxial tests and acoustic emission technology, Shi [8] studied the failure mechanism of CJRM. Jiang [9] investigated and experimentally studied the anisotropy of deformation and strength of CJRM based on field tests.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Mechanical Properties of Irregular Columnar Jointed Rock Mass

Yan

Xiang

et al. 2022

Front. Phys.

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Columnar jointed rock masses (CJRM) are characterized by significant anisotropy. The mechanical properties of CJRM are complicated by the presence of columnar joints. In this paper, based on the Voronoi random graph generation algorithm, the irregular CJRM numerical model is established, in which columns are simulated by solid elements while joints are simulated by contact surface elements. Uniaxial compression tests on irregular CJRM are then conducted by using FLAC3D to investigate the deformation and strength characteristics, and failure modes. Results indicate that irregular CJRM exhibit strong anisotropy under uniaxial compression, and the compressive strength varies with joint angle in a typical U-shape curve. Failure modes can be classified as three categories: splitting failure along loading direction, shear-sliding failure along columnar joint, and combined failure of column fracturing and joint splitting. The numerical results are then compared with the experimental results. It demonstrates the effectiveness and reliability of applying numerical simulation to investigations on mechanical properties and failure mechanism of irregular CJRM. The results of this study provide helpful information for the design and construction of the project involving CJRM.

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Study on the Strength Characteristics of Columnar Jointed Basalt with a True Triaxial Apparatus at the Baihetan Hydropower Station

Cited by 26 publications

References 20 publications

Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Experimental Study on the Response of Cracked Sandstone to the Intermediate Principal Stress Coupled with Pore Pressure

Numerical Simulation of Mechanical Properties of Irregular Columnar Jointed Rock Mass

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