Numerical simulation of rock cutting in deep mining conditions

2016 ◽  
Vol 84 ◽  
pp. 80-86 ◽  
Author(s):  
Jing Huang ◽  
Yimin Zhang ◽  
Lisha Zhu ◽  
Ting Wang
Keyword(s):  
Numerical Simulation ◽  
Rock Cutting ◽  
Deep Mining ◽  
Mining Conditions

scholarly journals Roof Cutting Parameters Design for Gob-Side Entry in Deep Coal Mine: A Case Study

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2032 ◽  
Author(s):  
Deyuan Fan ◽  
Xuesheng Liu ◽  
Yunliang Tan ◽  
Shilin Song ◽  
Qingheng Gu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Cutting Parameters ◽  
Surrounding Rock ◽  
Vertical Stress ◽  
Deep Mining ◽  
Cutting Angle ◽  
Working Face ◽  
Mining Conditions ◽  
Cutting Height

Roof cutting is an effective technique for controlling the deformation and failure of the surrounding rock in deep gob-side entry. The determination of the roof cutting parameters has become a popular research subject. Initially, two mechanical models are established for the non-roof-cutting and roof-cutting of gob-side entry in deep mining conditions. On this basis, the necessity and significance of roof cutting is revealed by analysing the stress and displacement of roadside prop. The Universal Distinct Element Code numerical simulation model is established to determine the key roof-cutting parameters (cutting angle and cutting height) according to the on-site situation of No. 2415 headentry of the Suncun coal mine, China. The numerical simulation results show that with the cutting angle and height increase, the vertical stress and horizontal displacement of the coal wall first increase and then decrease, as in the case of the vertical stress and displacement of roadside prop. Therefore, the optimum roof cutting parameters are determined as a cutting angle of 70° and cutting height of 8 m. Finally, a field application was performed at the No. 2415 headentry of the Suncun coal mine. In situ investigations show that after 10 m lagged the working face, the stress and displacement of roadside prop are obviously reduced with the hanging roof smoothly cut down, and they are stable at 19 MPa and 145 mm at 32 m behind the working face, respectively. This indicates that the stability of the surrounding rock was effectively controlled. This research demonstrates that the key parameters determined through a numerical simulation satisfactorily meet the production requirements and provide a reference for ensuring safe production in deep mining conditions.

scholarly journals Numerical Simulation of Rock Plate Cutting with Three Sides Fixed and One Side Free

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Zhenguo Lu ◽  
Lirong Wan ◽  
Qingliang Zeng ◽  
Xin Zhang ◽  
Kuidong Gao
Keyword(s):  
Numerical Simulation ◽  
Cutting Force ◽  
Cutting Speed ◽  
Rock Cutting ◽  
Numerical Results ◽  
Peak Force ◽  
Cutting Performance ◽  
Conical Pick ◽  
Cutting Method ◽  
Cutting Angle

In order to overcome conical pick wear in the traditional rock cutting method, a new cutting method was proposed on account of increasing free surface of the rock. The mechanical model of rock plate bending under concentrated force was established, and the first fracture position was given. The comparison between experimental and numerical results indicated that the numerical method is effective. A computer code LS-DYNA (3D) was employed to study the cutting performance of a conical pick. To study the rock size influenced on the cutting performance, the numerical simulations with different thickness, width, and height of a rock plate was carried out. The numerical simulation with the different cutting parameters of cutting speed, cutting angle, and cutting position influenced on cutting performance was also carried out. The numerical results indicated that the peak force increased with the increasing thickness of rock plate. With the increasing width and height of the rock plate, the peak force decreased and then became stable. Besides, the peak force decreased with the increasing of cutting position lxp/lx. Moreover, the peak force increased and then decreased with the increasing of cutting angle. The cutting speed has nonsignificant influence on the peak force. The strong exponential relationship was obtained between the peak force and cutting position, thickness, height, and width of the rock plate at a confidence level of 0.95. A binomial relationship was observed between the peak force and cutting angel. The cutting force comparison between traditional rock cutting and rock plate cutting indicated that the new cutting method can effectively reduce peak cutting force.

scholarly journals Rational size and stability analysis of horizontal isolated pillars in deep mining from caving to filling method

2021 ◽  
Vol 303 ◽  
pp. 01040
Author(s):  
Fan Feng ◽  
Xibing Li ◽  
Shaojie Chen ◽  
Dingxiao Peng ◽  
Zhuang Bian
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Mining Area ◽  
Middle Section ◽  
Deep Mining ◽  
Metal Mines ◽  
Lead Zinc ◽  
Filling Method ◽  
Zinc Mine ◽  
Cut And Fill

For mining using the caving and filling methods in metal mines, determining a suitable size for the isolated pillars—the connecting part of the extension from shallow to deep—is crucial for ensuring safety and efficiency. Considering actual cases involving deep caving and cut-and-fill mining in the Chifeng Hongling lead-zinc mine in Inner Mongolia, China, the reserved thickness range of the horizontal isolation layer is obtained via theoretical analysis. On this basis, the pre-processing software HyperMesh is used to build a high-precision hexahedral grid model of the mining area, and the three-dimensional geological model of the mining area is imported into the finite-difference software FLAC3D. The stress field, displacement field, and plastic area evolution law of pillars (horizontally isolated pillars and adjacent rib pillars) in the stope of the ninth middle section after excavation are analyzed via numerical simulation inversion of the selected scheme of horizontal isolated pillars. The numerical simulation results show that the scheme employed to retain the upper horizontal isolated pillars in the ninth middle section involves reserving thicknesses of 8 m and 32 m at average ore body thicknesses of 15 m and 35 m, respectively. These results can provide theoretical guidance and a basis for safe and efficient mining of deep metal mines.

scholarly journals Numerical simulation of rock cutting using 2D AUTODYN

2015 ◽  
Vol 100 ◽  
pp. 012052
Author(s):  
D E Woldemichael ◽  
A M Abdul Rani ◽  
T A Lemma ◽  
K Altaf
Keyword(s):  
Numerical Simulation ◽  
Rock Cutting

scholarly journals Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

2020 ◽  
Vol 10 (15) ◽  
pp. 5314
Author(s):  
Hoyoung Jeong ◽  
Seungbeom Choi ◽  
Sudeuk Lee ◽  
Seokwon Jeon
Keyword(s):  
Numerical Simulation ◽  
Cutting Tool ◽  
Damage Model ◽  
Rock Cutting ◽  
Cumulative Damage ◽  
Cutting Process ◽  
Smooth Particle Hydrodynamics ◽  
Cutting Simulation ◽  
Brittle Behavior ◽  
Particle Hydrodynamics

Various numerical methods have been used to simulate the rock cutting process. Numerical simulation is a useful tool for estimating the performance of a cutting tool and for understanding the mechanism of rock cutting and interaction between a cutting tool and the rock. These methods supplement the rock cutting test, which is commonly referred to as the linear cutting machine (LCM) test. Mechanical excavators, such as roadheaders, longwall shearers, and trenchers, generally use pick cutters as the cutting tool. In this study, a rock cutting simulation with a pick cutter was developed using the smooth particle hydrodynamics (SPH) technique, which is a mesh-free Lagrangian method. The Drucker–Prager (DP) strength model was used to simulate the brittle behavior of rock. The cumulative damage (CD) model was used to simulate the degraded fragmentation process of rock and the distinctive behavior of rock in the compression and tensile stress regions. In this study, an attempt was made to simulate sequential cutting by multiple pick cutters. The results showed that the numerical simulation matched the experimental results closely in terms of cutter forces, specific energy, and the fragmentation phenomenon. These results confirmed the applicability of the SPH technique in simulating the rock cutting process.

scholarly journals Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

2019 ◽  
Author(s):  
Shuo Qiao ◽  
Jingyi Xia ◽  
Yimin Xia ◽  
Zaizheng Liu ◽  
Jinshu Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Constitutive Model ◽  
Total Error ◽  
Rock Cutting ◽  
Maximum Deviation ◽  
Uniaxial Compression Test ◽  
Conical Pick ◽  
Simulation And Experiment ◽  
Coal Rock ◽  
Conical Picks

One of the key points in numerical simulation of coal-rock cutting by conical picks is to select a proper coal-rock constitutive model. In order to find a reasonable coal-rock constitutive model, a uniaxial compression test was conducted to obtain the constitutive model. The several stages for linear elastic deformation and creep, plastic yielding, hardening, and finally brittle cracking of the constitutive units were studied, and the coal-rock constitutive model was established. As a result, the coal-rock cutting by one conical pick or two conical picks was simulated and the results were compared with coal-rock cutting experiment on a Coal-rock Cutting Machine. According to the simulation and experimental results, it is believed that the numerical simulation can reveal coal-rock crushing process. And the total error rate of coal-rock cutting by one conical pick between the simulation and experiment is 8.5%. The maximum deviation of coal-rock cutting by two conical picks between the simulation and experiment is 9.8%. All simulation values are within a reasonable range. The comparison indicates that the coal-rock constitutive model should better be defined considering the coal-rock crushing process by conical picks.

Analysis of Inducing Factor of Thin Seam Rock Burst in Xinxing Mine

2014 ◽  
Vol 522-524 ◽  
pp. 1371-1376
Author(s):  
Zhu Peng Jin ◽  
Tao Qin ◽  
Zhen Wen Liu
Keyword(s):  
Rock Burst ◽  
Pressure Control ◽  
Hard Coal ◽  
Prevention Focus ◽  
Deep Mining ◽  
Mining Conditions ◽  
Pressure Control System ◽  
Inducing Factors ◽  
Thin Seam ◽  
The Impact

For occurring frequent thin seam rock burst disasters in deep mining stage in Xinxing Mine, through summarizing the mineral basic geological and mining conditions, on this basis, analysing the occurrence characteristics of rock burst with statistical method in Xinxing Mine, analyzing the inducing factors of thin seam rock burst, and through FLAC3D roadways along on 41,051 workface exploitation right beside left stacks of rock burst was simulated, and made a rock burst prevention focus for the impact of land pressure control system provides an effective basis. On thin hard coal burst prevention of important guiding significance.

Research on Numerical Simulation of Mining Subsidence

2011 ◽  
Vol 148-149 ◽  
pp. 384-387 ◽  
Author(s):  
Hong Ji ◽  
Xue Yi Yu
Keyword(s):  
Numerical Simulation ◽  
Mining Subsidence ◽  
Strip Mining ◽  
Mining Method ◽  
Surface Movement ◽  
Mining Conditions ◽  
The Law ◽  
Project Data ◽  
Mechanical Dynamics ◽  
Overlying Strata

The strip mining method is proposed to prohibit overlying strata and surface moving. The law of displacement and deformation damage of overlying strata and surface which is a sophisticated process of physical and mechanical dynamics is analyzed in theory. Based on the actual project data, the law is obtained by the numerical simulation with FLAC3D. Moreover, the strip reasonable mining method and interrelated parameters is presented according to the specific geology and mining conditions of coal. It is proved that the strip mining method can avoid geological damage effectively for overlying strata and surface movement in practice.

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