Study on Safe Thickness of Stope Roof and Ground Subsidence Based on Numerical Simulation

2014 ◽  
Vol 1065-1069 ◽  
pp. 71-75
Author(s):  
Shuai Hua ◽  
Yun An Li ◽  
Yue Wei Wang ◽  
Qin Gang Wang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Calculation Model ◽  
Simulation Software ◽  
Ground Subsidence ◽  
Minimum Thickness ◽  
Finite Element Software ◽  
Whole Process ◽  
Mechanics Model ◽  
Mine Excavation ◽  
Safe Thickness

It is mainly discussed that the minimum safe thickness of the stope roof and the ground subsidence deformation during mine excavation. The concrete method is deducing the theoretical calculation formula of minimum thickness of the stope roof according to the bending and shearing structural mechanics model respectively so as to gain the minimum safe thickness; A detailed engineering geological 3d model for mining concessions is built by using Auto CAD,and next a numerical calculation model is established by using ANSYS finite element software,following by importing it to numerical simulation software FLAC3D for calculation. By this method,the whole process of mine excavation can be simulated. Finally,the ground subsidence deformation obtained by simulation satisfies the specification requirements.

Research on the computing method for the forming velocity of circumferential multiple explosive formed projectiles

2019 ◽  
Vol 17 (2) ◽  
pp. 125-136 ◽  
Author(s):  
Zhen-gang Liang ◽  
Bai-xu Chen ◽  
Yu-xiang Nan ◽  
Jian-wei Jiang ◽  
Li Ding
Keyword(s):  
Numerical Simulation ◽  
Physical Model ◽  
Calculation Model ◽  
Simulation Software ◽  
Test Device ◽  
Charge Model ◽  
Circumferential Distribution ◽  
Coupling Algorithm ◽  
Computing Method ◽  
Energy Conservation Principle

To evaluate the damage capability of circumferential multiple explosive formed projectiles (MEFPs), it is required to predict the EFP forming velocity accurately and quickly. According to the circumferential MEFP liner characteristics of uniform circumferential distribution and layered axial structure, a simplified physical model of circumferential MEFPs is put forward innovatively. The Lagrange and Euler coupling algorithm is selected to simulate the simulation model, which is verified as equivalent to the circumferential MEFPs. Based on the energy conservation principle and the simplified equivalent physical model, the calculating model of the circumferential MEFP forming velocity is derived. The correctness and accuracy of the calculation model are verified by using the numerical simulation software and the test device of the round-shaped charge model.

scholarly journals Numerical Simulation of Dynamic Response Characteristics of Cutting Coal and Rock by a Roller Coal Cutter

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Kesong Fan ◽  
Yutong Feng ◽  
Ruoyang Kong ◽  
Hua Wei ◽  
Wenlong Jiao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Experiments ◽  
Simulation Software ◽  
Dynamic Responses ◽  
Average Speed ◽  
Response Characteristics ◽  
Whole Process ◽  
Different Types ◽  
Finite Element Numerical Simulation ◽  
Dynamic Response Characteristics

Currently, the identification technology of rock-coal medium is not reliable and practical, so we cannot judge the cutting state of coal-winning machine in real time. Different dynamic responses over different medium types of rock-coal can indirectly reflect the physical and mechanical parameters of rock-coal. In this study, we establish the 3-D numerical model of cutting the rock and coal by the finite element numerical simulation software in which we obtain the whole process of numerical simulation of the roller cutting coal, mudstone, and sandstone, where different dynamic responses counterpart different types of rock and coal by means of numerical experiments. The results show that when the drum keeps the average speed of cutting coal and medium forward, the instantaneous speed which is close to the average speed will have a small jump. The average speed and the torque in the cutting process can be considered as good indices to evaluate the rock and coal types. The torque from high to low is as follows: sandstone, mudstone, and coal. The average speed from high to low is as follows: coal, mudstone, and sandstone. If the portion of rock is more, the torque is higher and the average speed is lower during cutting the roof foot. This research is helpful for identifying rock-coal medium types by using related instrument to record the dynamic responses of rock-coal medium types.

scholarly journals Numerical simulation on fracturing behaviour of hard roofs at different levels during extra-thick coal seam mining

2020 ◽  
Vol 7 (1) ◽  
pp. 191383 ◽  
Author(s):  
Rui Gao ◽  
Bingjie Huo ◽  
Hongchun Xia ◽  
Xiangbin Meng
Keyword(s):  
Numerical Simulation ◽  
Simulation Software ◽  
Secondary Development ◽  
Coal Seams ◽  
Thick Coal Seam ◽  
Hard Roof ◽  
Finite Element Software ◽  
Bearing Stress ◽  
Seam Mining ◽  
Different Levels

In fully mechanized caving mining of extra-thick coal seams, the movement range of overburden is wide, resulting in the breakage of multilayer hard roofs in overlying large spaces. However, the characteristics, morphology and impact effect of hard roofs at different levels are different and unclear. In this study, a secondary development was used in the numerical simulation software ABAQUS, and the caving of rock strata in the finite-element software was realized. The bearing stress distribution, fracturing morphology and impact energy characteristics of hard roofs at different levels were studied to reflect the action and difference of hard roof failure on the working face; thus, revealing the mechanism of the strong ground pressure in stopes, and providing a theoretical basis for the safe and efficient mining of extra-thick coal seams with hard roofs.

Numerical Simulation Research on Deep Soft Rock Roadway

2012 ◽  
Vol 256-259 ◽  
pp. 1439-1442
Author(s):  
Bin Zhang ◽  
Xiang Lian Yu ◽  
Ning Liu ◽  
Feng Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Soft Rock ◽  
Simulation Software ◽  
Simulation Research ◽  
Finite Element Software ◽  
Support Measure ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

The soft rock roadway support is one of difficult problems in the mineral engineering. For making the stress and strains of support system to be effective forecasted in the process of roadway support. The Adina finite element software is used to do numerical simulation about the strains of the supports system in the process of the Hama mountain roadway, and compare with the date which was got from the field monitoring. The date comparison shows that the results of simulation is basic anastomotic with the examination at present. So that it can be well predicted the effectiveness of the support measure when using the finite element simulation software –Adina.

scholarly journals Research on hydrodynamic characteristics of cylinder planing

2021 ◽  
Vol 39 (1) ◽  
pp. 101-110
Author(s):  
Fuqiang Liu ◽  
Kai Luo ◽  
Hongge Liang ◽  
Chuang Huang ◽  
Shaohang Geng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Drag Coefficient ◽  
High Speed ◽  
Lift Coefficient ◽  
Hydrodynamic Characteristic ◽  
Calculation Model ◽  
Simulation Software ◽  
Hydrodynamic Characteristics ◽  
Water Splash ◽  
Flow Field Characteristics

This paper selects SST k-w turbulence model and VOF wave to construct a numerical calculation model of moving body planning on a flat free surface based on STAR-CCM+ numerical simulation software. The construction model is checked through foreign classic literature, and the numerical simulation results are in good agreement with the experimental results. The hydrodynamic numerical errors are less than 5%, which is within the engineering error range. The model can be used for the numerical simulation of the planning cylinder. In this paper, it is used to simulate the planing process of cylinder with different speeds and different submerged depths, and the flow field characteristics and hydrodynamic characteristics in the planing process are obtained. The results show that waves appear at the tail and the tail liquid splashes to form a water splash during the planing process of the cylinder on a flat surface. The higher the speed of the planning cylinder is, and the deeper the submersion depth, the more pronounced waves at the tail. When the cylinder has a Fr number Cv≥8, the hydrodynamic force of the cylinder is almost unchanged, and it is not affected by the speed. But when Cv=3, the hydrodynamic characteristic coefficient is higher. The drag coefficient is 20% higher than that in the high-speed (Cv≥8) planing process. The lift coefficient is 3 times of high-speed planing lift coefficient. It is related to the surface pressure and frictional force distribution of cylinder during the low-speed planing. There is a linear relationship between the drag coefficient and the submerged depth during the cylinder planing at different submerged depths.

scholarly journals Numerical Simulation of Surface Movement and Deformation Caused by Underground Mining with Complex Stratigraphic Boundary

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Liang Wang ◽  
Chao He ◽  
Songjun Cui ◽  
Feifei Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Underground Mining ◽  
Spline Interpolation ◽  
Calculation Model ◽  
Obvious Effect ◽  
Surface Movement ◽  
Research Results ◽  
Finite Element Software ◽  
Movement And Deformation

The interface program of finite element software based on surface spline interpolation is developed by using MATLAB software. The controllable 3D surface modeling based on CAD contour is realized. Taking a mine as an example, the method of establishing the 3D numerical calculation model including complex stratum boundary is studied. The influence of underground mining on surface movement and deformation under complex stratum conditions by using the FLAC3D software further was discussed. The research results show that the developed interface program of finite element software can well realize the numerical modeling of complex formation and provide help for subsequent numerical simulation. The calculated subsidence value is in good agreement with the measured value. The values of surface tilt, surface curvature, and surface horizontal deformation are less than the relevant regulations. The mining method of the filling method has no obvious effect on the surface structures. The research results can provide reference for similar numerical simulation.

The Numerical Simulation Analysis on Safety Stability in Underground Space of Urban Track Transportation System

2011 ◽  
Vol 90-93 ◽  
pp. 1812-1818
Author(s):  
Hong Ye Chen ◽  
Jing Fei Zhang ◽  
Hui Zhong Ma ◽  
Jin Ying Ma
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Transportation System ◽  
Simulation Software ◽  
Safety Measures ◽  
Engineering Construction ◽  
Whole Process ◽  
Risk Characteristics ◽  
Key Points ◽  
Engineering Projects

In order to study and demonstrate the safety condition of urban track transportation system in mechanics area, and to determine the key points and difficulties of this system, it uses FLAC3D numerical simulation software, combines the applied examples of engineering projects, carries on simulation analysis on aspects of surrounding soil’s deformation rule during construction stages, the mechanics analysis during main structure’s construction, and the system surrounding soil’s stress-strain rules during operation stages, etc.. Feasible safety measures and suggestions were proposed accordingly. The applied research indicates that the numerical simulation analysis can express the risk characteristics and rules well during engineering construction and after construction, and further avoid potential hazards or accidents’ occurrence, which has important meanings for ensuring the safety of engineering projects during the whole process.

scholarly journals Stress wave propagation in different number of fissured rock mass based on nonlinear analysis

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiaoming Lou ◽  
Mingwu Sun ◽  
Jin Yu
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Confining Pressure ◽  
Displacement Discontinuity ◽  
Stress Wave Propagation ◽  
Theoretical Derivation ◽  
Mechanics Model ◽  
Fissured Rock ◽  
Deep Rock ◽  
Theoretical Accuracy

AbstractThe fissures are ubiquitous in deep rock masses, and they are prone to instability and failure under dynamic loads. In order to study the propagation attenuation of dynamic stress waves in rock mass with different number of fractures under confining pressure, nonlinear theoretical analysis, indoor model test and numerical simulation are used respectively. The theoretical derivation is based on displacement discontinuity method and nonlinear fissure mechanics model named BB model. Using ABAQUS software to establish a numerical model to verify theoretical accuracy, and indoor model tests were carried out too. The research shows that the stress attenuation coefficient decreases with the increase of the number of fissures. The numerical simulation results and experimental results are basically consistent with the theoretical values, which verifies the rationality of the propagation equation.

Numerical Simulation of Filling and Solidification in Sand Casting by Procast

2013 ◽  
Vol 791-793 ◽  
pp. 550-553 ◽  
Author(s):  
Dong Dong Han ◽  
Cheng Jun Wang ◽  
Juan Chang ◽  
Lei Chen ◽  
Huai Bei Xie
Keyword(s):  
Numerical Simulation ◽  
Heat Dissipation ◽  
Solidification Process ◽  
Simulation Software ◽  
Sand Casting ◽  
Production Costs ◽  
Raw Material ◽  
Casting Defects ◽  
Three Dimension ◽  
Filling And Solidification

At present, pulley produced in China has been able to meet the demand of domestic and international markets. But there are many problem of the pulley industry in our country, such as too many production enterprises and the low level of export products. And as components of drive system are light weight and raw material price of pulley casting are rising, manufacturing requirements of the pulley are also more and more high. Aiming at the casting defects of pulley that enterprise current product, pulley casting blank model of common material HT250 be made by three-dimension software, numerical simulation of filling and solidification process for pulley sand casting by the casting simulation software Procast, the size and location of the various casting defects were forecasted and analyzed, reflecting the pulley filling and solidification process of the actual situation, due to the thicker pulley rim and less heat dissipation, position of shrinkage is close to the middle of rim [, a method of eliminating defects is proposed to realize sequential solidification, and thus to minimize porosity shrinkage and improve casting performance and reduce casting time and reduce production costs.

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