Numerical Simulation of Conical Pick Cutting Arc Rock Plate Fracture Based on ANSYS/LS‐DYNA

Wang, Zhiwen; Zeng, Qingliang; Lu, Zhenguo; Wan, Lirong; Zhang, Xin; Gao, Guanshun

doi:10.1155/2020/6563520

Cited by 63 publications

(3 citation statements)

References 21 publications

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“…The model was initially applied to concrete materials, and it has been shown that it has good applicability in the field of rock materials. It can be seen from the site geological survey that the site is basically complete and relatively complete limestone, and the relevant model parameters [27] are shown in Table 3 In Table 3 ρ denotes the density of rock; g represents the shear modulus of rock; f c means quasi-static uniaxial compressive strength; A, B, N and S max show the limit surface parameters, where A represents the characteristic viscous strength index, B represents the characteristic pressure hardening coefficient, N represents the pressure hardening index, and S max represents the maximum characteristic equivalent stress that the material can achieve. C represents the strain rate influence parameter; D 1 and D 2 indicate damage constants.…”

Section: Numerical Model 31 Model Parametersmentioning

confidence: 99%

Discussion on Blasting Vibration Velocity of Deep Rock Mass Considering Thickness of Overlying Soil Layer

Ruan¹,

Wang²,

Zhao³

et al. 2023

Period. Polytech. Civil Eng.

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The thickness of the overlying soil layer has a certain influence on the blasting vibration response of deep rock mass. The vibration wave velocity of the overlying soil layer during the construction of deep blasting is measured in this paper. Based on the measured data, parameters k and α of the Sadowski equation are used to characterize the influence of the comprehensive geological conditions of the site on the vibration wave propagation. The model of blasting vibration velocity of deep rock mass is established according to the existing blasting theory, and the calculation accuracy of the model is verified according to the field blasting parameters. The new model is used to simulate different overlying soil thicknesses, and the safe allowable distance under different soil thicknesses is calculated. The calculated results show that with the increase of the thickness of the overlying soil layer, the blasting vibration velocity decreases and the attenuation velocity decreases gradually. The research results reveal the reduction effect of overlying soil thickness on blasting vibration to some extent. In the area with overlying soil layer, the safe allowable distance of blasting vibration safety can be appropriately reduced to increase the land utilization rate, which has important reference value for the blasting design and safety prediction of deep rock mass.

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Section: Numerical Model 31 Model Parametersmentioning

confidence: 99%

Discussion on Blasting Vibration Velocity of Deep Rock Mass Considering Thickness of Overlying Soil Layer

Ruan¹,

Wang²,

Zhao³

et al. 2023

Period. Polytech. Civil Eng.

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“…Besides, numerical simulation tests are often widely applied in studying the failure process of rock mass. Simulators such as ABAQUS, ANSYS, FLAC3D and CASRock regard rock mass as a continuous medium, and the finite element method, finite difference method, cellular automata were used in the discretization equation and simulate the expansion process of static and dynamic cracks in rock mass [26][27][28][29]. Discrete element methods, without specifying complex crack initiation criteria, regard a rock mass as a discontinuous discrete medium and have been widely applied in simulating crack propagation and failure analysis of rock masses [30].…”

Section: Introductionmentioning

confidence: 99%

Meso-Mechanical Characteristics of Granite with Natural Cracks after Mud Acid Corrosion

Tong

Liu

et al. 2022

Energies

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Most of the discovered high-temperature geothermal energy systems are often related with granite that is characterized by natural faults, fractures and cracks of different size. However, the porosity and permeability of the granite matrix is very low, greatly limiting the efficiency of heat extraction in granitic rock. Chemical stimulation, which is regarded as one of the most important means of reservoir stimulation, has consequently received more and more attention. In this paper, a Triassic granite obtained from the eastern region of Liaoning Province in China was reacted with three different concentration of mud acid solution (8% HCl + 1% HF, 10% HCl + 2% HF, 12% HCl + 3% HF) and the resulting microstructure changes studied by scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR). The experimental results show that the number of micropores in the granite increases after chemical corrosion by mud acid solution. A higher mud acid solution concentration results in a much higher pore volume. Triaxial compression tests on the granite before and after chemical corrosion were carried out to study the effect of acidification on the mechanical characteristics of granite, showing that the peak stress and elastic modulus of granite decreases 25.7% and 16.5%, respectively, after exposure to mud acid solution (12% HCl + 3% HF) corrosion for three weeks at room temperature. The particle flow program PFC2D based on discrete element method was used to investigate the mechanical response before and after the chemical corrosion. Considering that the granite is rich in microcracks, the study is simplified by considering them all grouped into one main closed fracture. The influences of main crack inclination angle, crack length, friction coefficient and confining pressure on the mechanical response were investigated. Under the triaxial compression loading state, wing cracks appear at the initial crack tip, then secondary cracks begin to appear. The sensitivity analysis shows that three characteristic strengths (crack initiation strength, damage strength and peak strength) are strongly correlated with crack length, crack inclination angle, crack surface friction coefficient and confining pressure. These three characteristic strengths decrease 60%, 59% and 53%, respectively, compared with their initial values with the increase of main crack length from 6 mm to 22 mm, while they present positive correlation with the fracture friction coefficient from 0 to 1.0 and confining pressure from 10 to 50 MPa. There is a critical inclination angle of the main crack (i.e., 45°), meaning that these three characteristic strengths of granite decrease with inclination angles smaller than 45°, while they increase with an inclination angle larger than 45°. After the corrosion effect of mud acid solution on granite, the pore structure was changed and mechanical properties was damaged, which further affect the failure mode and failure process of granite samples affected by mud acid solutions. This paper provides a theoretical reference for evaluating the effect of chemical stimulation technology on the mechanical characteristics of granite, serving for the continuous hydraulic stimulation design after the chemical stimulation.

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“…Lu et al [20][21][22][23][24] proposed a combined cutting method of saw blade-pick and studied the cutting force of rock under different conditions. Wang et al 25,26 researched the effects of the cutting parameters of diamond sawblades on cutting rock and investigated the relationship between cutting force and cutting parameters of the conical pick in the rock cutting process.…”

Section: Introductionmentioning

confidence: 99%

Research on Cutting Performance of Conical Pick Cutting Rock Plate with One Side Constrain and Three Sides Free

Wang

Zeng

et al. 2022

Science Progress

Self Cite

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To improve the conical pick cutting performance by per cutting to the free surface. The cutting performance of rock and rock plate breaking are investigated by theoretical and experimental methods. Analyzed the fracture position of the rock plate with constrained one side by the pick to study the effect of rock properties and the rock plate structural parameters on cutting force. The results indicated that the rock plate fracture is mainly from the constrained side and center of the rock plate. The cutting force of the conical pick is significantly affected by the rock plate structural parameters and the constraint sides of the rock plate number. The cutting force increases obviously with the increase of plate thickness, cutting point depth, and the rock uniaxial compressive strength. However, the influence of rock plate constrains sides number is opposite. It provides a basis for improving the cutting performance of pick and predicting the rock plate fracture.

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Numerical Simulation of Conical Pick Cutting Arc Rock Plate Fracture Based on ANSYS/LS‐DYNA

Cited by 63 publications

References 21 publications

Discussion on Blasting Vibration Velocity of Deep Rock Mass Considering Thickness of Overlying Soil Layer

Discussion on Blasting Vibration Velocity of Deep Rock Mass Considering Thickness of Overlying Soil Layer

Meso-Mechanical Characteristics of Granite with Natural Cracks after Mud Acid Corrosion

Research on Cutting Performance of Conical Pick Cutting Rock Plate with One Side Constrain and Three Sides Free

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