The Application of Numerical Simulation in Feasibility Research of Ascending Mining

2014 ◽  
Vol 962-965 ◽  
pp. 1175-1178
Author(s):  
Bao Feng Zhao ◽  
Lian Jing Ma
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Coal Mining ◽  
Coal Mine ◽  
Fracture Zone ◽  
Three Dimensional ◽  
Ratio Method ◽  
Feasibility Research ◽  
Hydrogeological Conditions ◽  
Balance Analysis

In order to study the feasibility of the ascending mining in Maiduoshan coal mine, the “two belts” of 6# coal should be predicting. Based on the analyzing of mine hydrogeological conditions, the three-dimensional numerical model is established by the FLAC3D, the scope of “two belts” by lower coal mining is predicted. The results shows that the fracture zone height of 6# coal less than the distance between 6# coal and 2# coal, and Maiduoshan coal mine meet the requirement of ascending mining. At the same time, combining the ratio method and balance analysis of surrouding rock, ascending mining is feasible in Maiduoshan coal mine.

Numerical Simulation on Water Invasion of Coal Mine

2013 ◽  
Vol 316-317 ◽  
pp. 1112-1117 ◽  
Author(s):  
Ai Jun Shao ◽  
Yuan Huang ◽  
Qing Xin Meng
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Groundwater Flow ◽  
Water Level ◽  
Coal Mining ◽  
Coal Mine ◽  
Mine Drainage ◽  
Model Verification ◽  
Mine Area ◽  
Hydrogeological Conditions

This paper presents the numerical simulation of groundwater flow and the prediction of drainage in the No.5 mine of the Feng-feng coal mine area, using the data from a water invasion. First of all, we build a mathematical model of groundwater flow according to the hydrogeological conditions. Then, the model is verified by the water invasion data. The measured and simulated water level fit well during the model verification. At last, the mine drainage was predicted using the established model. The results indicated that the coal mining below -100m would result in a large amount of drainage and relative high cost.

scholarly journals Blowing and drifting snow in Alpine terrain: numerical simulation and related field measurements

1998 ◽  
Vol 26 ◽  
pp. 174-178 ◽  
Author(s):  
Peter Gauer
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Three Dimensional ◽  
Field Measurements ◽  
Blowing Snow ◽  
Related Field ◽  
Drifting Snow ◽  
Physically Based ◽  
Snow Transport

A physically based numerical model of drifting and blowing snow in three-dimensional terrain is developed. The model includes snow transport by saltation and suspension. As an example, a numerical simulation for an Alpine ridge is presented and compared with field measurements.

Analysis of Three-Dimensional Numerical Simulationin on Overlying Strata’s Stress Field and Displacement Field in Thick Seam Mining

2013 ◽  
Vol 718-720 ◽  
pp. 1919-1922
Author(s):  
Meng Lin Xu ◽  
De Shen Zhao
Keyword(s):  
Numerical Simulation ◽  
Stress Field ◽  
Coal Mining ◽  
Displacement Field ◽  
Three Dimensional ◽  
Mining Technology ◽  
Thick Seam ◽  
High Efficient ◽  
Seam Mining ◽  
Overburden Strata

It takes the typical coal of mining in S2S9 face of Daping mine, using the 3-D numerical simulation to reveal on its face with the vertical characteristics of the stress field and displacement field .The study showed that the overburden strata migration features during the mining process in in thick seam mining of Daping mine.This research can be a reference for safety and high efficient coal mining of other parts of the soft overburden in extra- thick seam mining technology.

Application of Numerical Simulation in the Analysis of Water Supply Stability of Power Plant

2014 ◽  
Vol 955-959 ◽  
pp. 3442-3447 ◽  
Author(s):  
You Ping Zou ◽  
Lei Li
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Water Supply ◽  
Coal Mine ◽  
Large Diameter ◽  
Simulation Software ◽  
Water Inflow ◽  
Plant Water ◽  
Visual Modflow ◽  
Hydrogeological Conditions

Currently, the mine water inflow is often forecasted by using the large diameter well method, but under complicated hydrogeological conditions where Dupuit well flow formula is not suitable, the said method is not applicable. The paper takes an example of the water inflow forecast of Chaokewula Coal Mine and discusses the solution of adopting the numerical simulation software Visual Modflow: the simulation scope is defined by analyzing the hydrogeological conditions of Chaokewula Coal Mine to set a mathematical model that fits the actual situation. The model can be identified and verified based on the set model boundary conditions, model spatial discretization, initial conditions and simulation period. Forecast the water inflow of each working face in 30 years by using the underground water numerical simulation software Visual MODFLOW so as to provide a basis for the stability estimation of the mines power plant water supply. Keywords: Numerical Simulation, Water Inflow, Power Plant Water Supply

The Study on Roadway Layout in Coordination of Mining Coal Seams Base on Failure of Floor Strata

2014 ◽  
Vol 889-890 ◽  
pp. 1362-1374 ◽  
Author(s):  
Yong Zhang ◽  
Chun Lei Zhang ◽  
Chun Chen Wei ◽  
Ya Dong Liu ◽  
Shi Qing Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Coal Seam ◽  
Coal Mining ◽  
Coal Mine ◽  
Simulation Software ◽  
Coal Seams ◽  
Group Coordination ◽  
Mining Coal ◽  
Two Sides

In order to make sure the reasonable roadway layout in lower seam of close coal mining group coordination in Lijiahao coal mine, firstly, applying the theoretical analysis and geological radar detection to get the influence depth of mining from the up coal seam 2-2 to the floor is about 20m, the results show that the thickness of complete strata is about 15m, then determining to use the outward alternate entries in lower seam roadway by using theoretical analysis. At last, determining the distance of outward alternate entries is 12-14m by using FLAC3D numerical simulation software to simulate the change of stress and displacement in roof floor and two sides of roadway.

Numerical Simulation of Vertical Forced Plume in a Crossflow of Stably Stratified Fluid

1995 ◽  
Vol 117 (4) ◽  
pp. 696-705 ◽  
Author(s):  
Robert R. Hwang ◽  
T. P. Chiang
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Cross Section ◽  
Three Dimensional ◽  
Experimental Measurements ◽  
Secondary Vortex ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Vortex Pairs ◽  
Plume Flows

In this study, an investigation using a three-dimensional numerical model, which treats conservation of mass, momentum, and salinity simultaneously, was carried out to study the character of a vertical forced plume in a uniform cross-stream of stably linear stratified environment. A k-ε turbulence model was used to simulate the turbulent phenomena and close the solving problem. The performance of the three-dimensional model is evaluated by comparison of the numerical results with some available experimental measurements. Results indicate that the numerical computation simulates satisfactorily the plume behavior in a stratified crossflow. The secondary vortex pairs in the cross section induced by the primary one change as the plume flows downstream. This denotes the transformation of entrainment mechanism in stratified crossflow.

scholarly journals Fracture evolution and gas transport laws of coal and rock in one kilometer deep coal mine with complicated conditions

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 907-915
Author(s):  
Jianguo Zhang ◽  
Man Wang ◽  
Yingwei Wang
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Coal Mine ◽  
Fracture Zone ◽  
Gas Flow ◽  
Gas Transport ◽  
Enhancement Effect ◽  
Gas Extraction ◽  
Coal Seams ◽  
Long Distance

As coal mining gradually extends deeper, coal seams in China generally show high stress, high gas pressure and low permeability, bringing more difficulty to coal mining. Therefore, in order to strengthen gas extraction, it is necessary to carry out reservoir reconstruction after deep coal seams reached. In this paper, the distribution and evolution laws of fracture zone overlaying strata of J15 seam in Pingdingshan No. 10 coal mine after excavation were studied by combining similar simulation and numerical simulation, meanwhile, the gas transport law within fracture zone was numerically simulated. The results show that the fracture zone reaches a maximum of 350 mm in the vertical direction and is 75 mm away from W9,10 coal seams in vertical distance. Since W9,10 coal seams are in an area greatly affected by the bending zone of J15 coal seam under the influence of mining, the mining of J15 coal seam will exert a strong permeability enhancement effect on W9,10 coal seams. The J15 coal seam can act as a long-distance protective layer of W9,10 coal seams to eliminate the outburst danger of the long-distance coal seams in bending zone with coal and gas outburst danger, thereby achiev?ing safe, productive and efficient integrated mining of coal and gas resources. The gas flux of mining-induced fractures in the trapezoidal stage of mining-induced fracture field is far greater than that in the overlaying stratum matrix. The horizontal separation fractures and vertical broken fractures within the mining-induced fracture field act as passages for gas-flow. Compared with gas transport in the overlaying stratum matrix, the horizontal separation fractures and vertical broken fractures within the mining-induced fracture field play a role in guiding gas-flow. The research results can provide theoretical support for the arrangement of high-level gas extraction boreholes in roof fracture zones.

A Study on the Evolution of Distributary Channels in River-Dominated Deltas Using Numerical Simulations of Hydrodynamic Behaviors

2015 ◽  
Vol 744-746 ◽  
pp. 1050-1055
Author(s):  
Yang Jun Wang ◽  
Tai Ju Yin ◽  
Zhi Hao Deng
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Quantitative Methods ◽  
Oil And Gas ◽  
Reference Model ◽  
Three Dimensional ◽  
Hydrodynamic Characteristics ◽  
Oil And Gas Exploration ◽  
Hydrodynamic Behaviors ◽  
Distributary Channel

The Fluvial-dominated delta is one of the extremely important deposition systems in oil and gas exploration. In this paper, the three-dimensional numerical simulation of hydrodynamics has been applied to the precise analysis of the formation of fluvial-dominated deltas and the evolution of their distributary channels. The model has been created using the Delft3D program, and the conditions of the numerical model have been set according to the hydrodynamic characteristics of modern rivers and deltas. The calculation field was 20.5 km in length by 10 km in width. With the Mor-Factor set to 60, the simulation time was 45 days. The formation and the avulsion of the mouth bar, as well as the extension, migration and bifurcation of distributary channels, have been observed and studied through analysis of the simulation results. The vertical cross-section shows that the distributary channel was filled multiple times. According to distributary channel evolution characteristics combined with quantitative methods, the terminal distributary channels can be extremely developed under ideal conditions. Due to the cross-cutting and reform effort of distributary channels, sediments were spread widely and continuously. The results show that the numerical model works well in explaining the process of evolution in fluvial-dominated delta distributary channels. This study not only enables us to quantitatively understand the dynamic processes of terminal distributary channels in fluvial-dominated delta systems, but also provides a reference model for numerical simulation of hydrodynamics in sedimentology study.

Numerical Simulation of Friction Stir Spot Welding

2016 ◽  
Vol 834 ◽  
pp. 43-48 ◽  
Author(s):  
Marius Adrian Constantin ◽  
Ana Boşneag ◽  
Monica Iordache ◽  
Claudiu Bădulescu ◽  
Eduard Niţu
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Spot Welding ◽  
Frictional Heating ◽  
Three Dimensional ◽  
High Strength Steels ◽  
High Strength ◽  
Friction Stir Spot Welding ◽  
Fe Model ◽  
Friction Stir

Friction Stir Spot Welding (FSSW) is a solid state joining process that relies on frictional heating and plastic deformation realized at the interaction between a non-consumable welding tool that rotates on the contact surfaces of the workpieces. Friction Stir Spot Welding (FSSW) is an evolving technique that has received considerable attention from automotive industries to replace electric resistance spot welding, which shows poor weldability for advanced high-strength steels as well as aluminium alloys. Because of the interest shown by the industry towards this process, an attempt to optimize it is imperative. But the experiments are often time consuming and costly. To overcome these problems, numerical analysis has frequently been used in the last years. The purpose of this paper is to develop a three-dimensional fully coupled thermal-stress finite element (FE) model of FSSW process for thin aluminium alloy Al 6061-T6. Numerical simulation being helpful for better understanding and observation of the influence of input parameters on the resulting phenomena. It is described the algorithm and are presented the activities needed to be performed in order to develop a valid numerical model for FSSW. The validation of the numerical model being achieved by comparing the resulted temperatures from the numerical simulation with the experimentally determined temperatures for the same material

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