Stress distribution of mine roof with the boundary element method

Wu, Rong-Tsun; Xu, Jianhui; Li, Chen; Wang, Z.L.; Qin, Shenjun

doi:10.1016/j.enganabound.2014.07.009

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…The larger k is, the more violently the drum torque fluctuates. For the purpose of evaluating the cutting efficiency of the drum in different conditions, the specific energy (SE) [27,28] in experiment and simulation was calculated by Eq. (6).…”

Section: Validation and Discussionmentioning

confidence: 99%

A study on drum cutting properties with full-scale experiments and numerical simulations

Wang

et al. 2018

Measurement

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In order to investigate the properties of cutting loads on shearer drum, a series of full-scale shearer drum cutting tests were conducted in the National Energy Coal Mining Machinery Equipment Research and Design Center of China. The pick forces and the torque acting on the drum were measured and recorded under different cutting conditions by the strain sensors that were embedded in the cutting picks. Besides, an attempt was made to simulate the shearer drum cutting process. For this purpose, a computer program named Particle Flow Code in three dimensions (PFC3D) based on discrete element method (DEM) was used. The rock sample was models by graded particle assemblies and the micro-properties were calibrated by modeling the uniaxial compressive strength tests. The cutting process for the front and back drums with different traction speeds were simulated with this model. The torque of drums and forces of each pick were obtained during the simulation. Reasonable agreement and significant correlations were found between experiment and numerical simulation in terms of cutting forces of picks and the mean torque of the drums. The specific energy increased with the increase of traction speed in experiments, which was reproduced well in numerical simulation. Moreover, according to the analysis in frequency domain, the vibration of drum torque consists of components with multiple frequencies below 50 Hz, which is observed in both experiment and simulation. Therefore, numerical simulation by PFC3D is an easier, faster and reasonable method in the prediction of drum cutting load and design of shearer drum.

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Section: Validation and Discussionmentioning

confidence: 99%

A study on drum cutting properties with full-scale experiments and numerical simulations

Wang

et al. 2018

Measurement

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“…The effective parameters on the underground tunnel stability were evaluated by Panji et al [45]. Wu et al [81] exhibited the stress distribution in subsurface structures. In another study, Panji et al [48] analyzed the stability of shallow tunnels subjected to eccentric loads.…”

Section: Introductionmentioning

confidence: 99%

Seismic ground response by twin lined tunnels with different cross sections

Panji

Mojtabazadeh-Hasanlouei

2021

SN Appl. Sci.

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In this paper, the geometrical effects of shallow twin lined tunnels with different cross sections are investigated to obtain the anti-plane seismic ground motion under vertical/horizontal incident plane SH waves. A model of long two-dimensional lined tunnels is established and embedded in a homogeneous linear elastic half-plane by an applied numerical time-domain boundary element approach. In addition to a brief introduction to the formulation of the method, by considering five tunnel sections including circular, elliptical, horseshoe, square and rectangular, the surface response is sensitized to observe the normalized displacement amplitude/amplification ratio. In this regard, the angle of the incident wave and the frequency of the response are also included in changing the response pattern. To illustrate the results in both time and frequency domains, they are presented as blanket charts, snapshots, and three-/two-dimensional diagrams. The results showed that the seismic response of the surface is extremely affected by the geometric parameters of underground tunnels, which can create different conditions on the ground surface with shifting the direction of the wavefront. Article Highlights Geometrical effect of twin horizontally overlapping lined tunnels. Applying a time-domain half-plane boundary element method. Illustrating the response in time and frequency domains. The effect of depth and distance ratios on the seismic ground motion. Propagating vertical and horizontal incident SH-wave type. Graphic Abstract

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“…With the rapid development of computer technology, numerical simulation has been used in recent years to study the stability of surrounding rock in mining. Several models, such as finite element models (FEMs) [16], boundary element models (BEMs) [17], and discrete element models (DEMs) [18], have been proposed for numerical simulation, and all three methods have advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

A Three‐Dimensional Nonlinear Dynamic Numerical Optimization of the Risks of Stope Blasting Based on FOA‐GRNN

Xie

Cao

Shi

2021

Shock and Vibration

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The fruit fly optimization algorithm-general regression neural network (FOA-GRNN) coupled model and the Finite Element Method-Smoothed Particle Hydrodynamics (FEM-SPH) numerical calculation method are comprehensively used. The control problem of blasting vibration in the process of mining hidden resources under complex environmental conditions has been studied. Taking a lead-zinc mine as the engineering background, the development of hidden resources in the collapse area due to unreasonable mining was studied. Based on the establishment of the first mining stope and its mining method in this area, biosimulation and generalized neural networks were introduced to solve this problem, the coupling of blasting parameters was analyzed, and the 3D nonlinear dynamic coupling model was constructed for numerical simulation. The results show that the blasting parameters of deep-hole mining were optimized, including the values of six output quantities: hole distance, row spacing, side hole distance, explosive unit consumption, minimum resistance line, and interval ratio (the Root Mean Squared Error value is only 0.051). The error between the network optimization parameters and the empirically obtained values was controlled to within 0.05; five possible edge-hole charge structures were designed (the interval ratio is 0.696), and the vibration velocity peak and pressure peak variations with time after detonation are reflected by the simulation results. The dynamic evolution law of the rock mass velocity vector and the damage of the rock damage was revealed. According to the analysis in this paper, the smallest and optimal edge-hole charge structure of the surrounding rock was obtained.

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Stress distribution of mine roof with the boundary element method

Cited by 17 publications

References 16 publications

A study on drum cutting properties with full-scale experiments and numerical simulations

A study on drum cutting properties with full-scale experiments and numerical simulations

Seismic ground response by twin lined tunnels with different cross sections

A Three‐Dimensional Nonlinear Dynamic Numerical Optimization of the Risks of Stope Blasting Based on FOA‐GRNN

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