A roughness parameter considering joint material properties and peak shear strength model for rock joints

Ban, Liren; Du, Weisheng; Jin, Tianwei; Qi, Chengzhi; Li, Xiaozhao

doi:10.1016/j.ijmst.2021.03.007

Cited by 33 publications

(8 citation statements)

References 30 publications

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“…The dynamic progress in the field of technical sciences in recent decades has made it necessary to develop mathematical and numerical tools to help solve many scientific concerns (not only current but also predicted [2,[8][9][10]28]) and engineering problems in the design, improvement of efficiency and performance parameters of machines and devices [28]. Computational fluid mechanics (computational fluid dynamics), is a separate area of fluid mechanics in which numerical methods are used to solve problems with the description of fluids.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the electric bus radiator design in terms of noise emissions and energy consumption by computational fluid dynamics

Janicka¹,

Zawiślak²,

Głogoza³

et al. 2022

Combustion Engines

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The paper presents the numerical optimization of an innovative radiator for use in electric buses in terms of energy consumption and noise emission. Computational fluid dynamics simulations were performed. The flow of the cooling medium was modeled using the RANS method. The two-equation k-ɛ turbulence model, the heat transfer model and the acoustic model were used. According to the research results, the separation of the air stream in individual fan sections con-tributes to the improvement of energy efficiency and reduces noise emissions. As a result of the simulation, it was found that the best solution in terms of noise emission as well as the occurring flow phenomena caused about a 2 dB decrease of maximum values of the noise level and allowed the equalization of the cooling medium velocity (prevailing velocity range between 4 and 9 m/s). The results of the simulations were verified under laboratory and field conditions, showing a very good convergence of the model with the results of the experiments (i.e. the maximum noise level was estimated at 57 dB, under measurement conditions for the same operating point at 59 dB) while maintaining the baseline energy demand, which indicates a new approach in the method of shaping internal elements of electric vehicle coolers.

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Section: Introductionmentioning

confidence: 99%

Optimization of the electric bus radiator design in terms of noise emissions and energy consumption by computational fluid dynamics

Janicka¹,

Zawiślak²,

Głogoza³

et al. 2022

Combustion Engines

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“…The JRC affects the real contact area, which plays a significant role in the shear mechanical properties of the structural planes. For example, Ban et al [ 11 ] proposed a model of rock joint peak shear strength based on roughness parameters and shear test results. Zhang et al [ 12 ] employed direct shear test data to study the influence of roughness on shear strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of joint roughness coefficient and size on shear and characteristic strengths of structural planes

Zhang

Liang

et al. 2022

PLoS ONE

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Joint roughness coefficients (JRCs) influence the shear and characteristic strengths of structural planes; however, the relationship model of this influence is yet to be derived. This study investigates 11 numerical simulation programs using a realistic failure process analysis software. The influence of size and JRC on the shear strengths of the structural planes was studied. The stress-strain curves of different JRCs and their sizes were analyzed. Mathematical models of the shear strength of structural planes and JRC and sizes were formulated and proposed, and their expressions were obtained. Moreover, mathematical models of JRC and the characteristic size and strength of the structural planes were established.

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“…The existence of joints makes the fracture forms of rock mass more diverse and complex, and is also the most important factor in reducing the overall strength of rock mass (Shaunik and Singh, 2020;Tian et al, 2020;Guo et al, 2022). Under loaded conditions, the entire rock mass is more likely to rupture or even collapse due to the presence of joints (Liu et al, 2013;Ban et al, 2021;Tian et al, 2020). Therefore, the damage and strength characteristics of jointed rock mass have become important factors affecting the stability and safety of underground cavern excavation and slope engineering, giving them great research significance (Li et al, 2019;Dong et al, 2021;He et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effects of Normal Stress and Joint Inclination Angle on Rock Failure Characteristics Under Compression–Shear Conditions

Chen

Liu

Wang³

et al. 2022

Front. Earth Sci.

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In this study, cement mortar was used to make specimens containing groups of parallel joints with different inclination angles to simulate natural rock mass, and the specimens were subjected to shear tests under different normal stresses. By analyzing the crack propagation path, failure modes, and strength characteristics of these rock specimens, the effects of normal stress and joint inclination angles on the strength and failure characteristics of this type of rock mass were studied. The following conclusions are drawn: 1) when the inclination angles of the joints are 0° and 15°, the changing of the normal stress did not affect the failure mode of the rock mass. The rock mass was mainly in the mode of shear failure, and the increase in the normal stress only increased the spalling area of the rock mass. 2) When the inclination angles of the joints are 30°, 45°, and 60°, with the increasing of the normal stress, the number of those approximately parallel cracks in the specimens increased, the friction marks caused by shearing increased, and the failure mode of the rock mass changed from tension failure to tension–shear composite failure. 3) Under different joint inclination angles, the propagation and penetration paths of cracks generated in the rock mass and the damage mode of the rock mass were different. With an increase in the joint inclination angles, the damage mode of the rock mass gradually changes from shear damage to tensile–shear composite damage and the α and β angles between the through cracks and the vertical direction on the left and right sides of the specimens tended to decrease. 4) The shear resistance of the rock mass was affected by the inclination angle of the joints and the normal pressure. The shear resistance of rock mass was improved due to the increasing of normal stress. Within a certain range, with the increasing of the inclination angles of the joint, the shear resistance of the rock mass tended to decrease first and then to increase.

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A roughness parameter considering joint material properties and peak shear strength model for rock joints

Cited by 33 publications

References 30 publications

Optimization of the electric bus radiator design in terms of noise emissions and energy consumption by computational fluid dynamics

Optimization of the electric bus radiator design in terms of noise emissions and energy consumption by computational fluid dynamics

Effect of joint roughness coefficient and size on shear and characteristic strengths of structural planes

Effects of Normal Stress and Joint Inclination Angle on Rock Failure Characteristics Under Compression–Shear Conditions

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