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.

Study on Deformation of Tunnel with Underlying Coal Mining

2011 ◽  
Vol 105-107 ◽  
pp. 1295-1298
Author(s):  
Zhi Gang Yan
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Coal Mining ◽  
Calculation Method ◽  
Surface Subsidence ◽  
Mining Technology ◽  
Deformation Law ◽  
Coal Block ◽  
Dip Angle ◽  
Seam Mining

Coal mining can cause the strata distortion and surface subsidence. With infrastructure construction scale in our country enlargement, the case of approaching excavation caused by coal mining is increasing and more complicated. The calculation method of current regulations is too simple and don't conform to the present coal mining technology, so it will cause serious waste of resources. By using numerical simulation, this paper regards the influence of coal mining on the above tunnel as approaching excavation problem and studies the tunnel deformation law with three different coal mining mode. Based on the analysis and calculation, this paper proposes measures to ensure that the coal seam mining and tunnel's safety. The result indicates the more smaller the dip angle of coal block the more larger the displacement and the deformation range of tunnel. The most effective method for decrease deformation is the backfill method. If the conditions are permitted, backfill method is the preferred method and longwall caving method is last.

scholarly journals A Mechanical Model of the Overlying Rock Masses in Undersea Coal Mining and a Stress-Seepage Coupling Numerical Simulation

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Jie Fang ◽  
Lei Tian ◽  
Yanyan Cai ◽  
Zhiguo Cao ◽  
Jinhao Wen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Coal Mining ◽  
Water Inrush ◽  
Mining Area ◽  
Analysis Model ◽  
Fractured Zones ◽  
Working Face ◽  
Seam Mining ◽  
Overlying Strata

The water inrush of a working face is the main hidden danger to the safe mining of underwater coal seams. It is known that the development of water-flowing fractured zones in overlying strata is the basic path which causes water inrushes in working faces. In the engineering background of the underwater mining in the Longkou Mining Area, the analysis model and judgment method of crack propagation were created on the basis of the Mohr–Coulomb criterion. Fish language was used to couple the extension model into the FLAC3d software, in order to simulate the mining process of the underwater coal seam, as well as to analyze the initiation evolutionary characteristics and seepage laws of the fractured zones in the overlying strata during the advancing processes of the working face. The results showed that, during the coal seam mining process, the mining fractured zones which had been caused by the compression-shear and tension-shear were mainly concentrated in the overlying strata of the working face. Also, the open-off cut and mining working face were the key sections of the water inrush in the rock mass. The condition of the water disaster was the formation of a water inrush channel. The possible water inrush channels in underwater coal mining are mainly composed of water-flowing fractured zones which are formed during the excavation processes. The numerical simulation results were validated through the practical engineering of field observations on the height of water-flowing fractured zone, which displayed a favorable adaptability.

Study of Viscoelasto-Plastic Model with Double Yield Surface Considering Coupled Deformation and Seepage

2013 ◽  
Vol 405-408 ◽  
pp. 173-176
Author(s):  
Bi Fei Wang ◽  
Yong Quan Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Stress Field ◽  
Numerical Method ◽  
Displacement Field ◽  
Yield Surface ◽  
Engineering Practice ◽  
Plastic Model ◽  
General Law ◽  
Double Yield

The Viscoelasto-Plastic Model with Double Yield Surface is detailed deduced. Finite element equations are introduced when the deformation is considered under Coupled Deformation and Seepage Fields. Numerical simulation is carried out during the construction of the dam. All the results calculated are in accordance with the general law of the dam. Those show that it is feasible for calculating the stress field and displacement field. The method adopted and those results gained by numerical method may provide reference to engineering practice.

scholarly journals Study on the Evolution Characteristics of Two-Zone Failure Mode of the Overburden Strata under Shallow Buried Thick Seam Mining

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Daming Yang ◽  
Wenbing Guo ◽  
Yi Tan
Keyword(s):  
Failure Mode ◽  
Fracture Zone ◽  
Layer Structure ◽  
Physical Modelling ◽  
Thick Seam ◽  
Working Face ◽  
Evolution Characteristics ◽  
Caving Zone ◽  
Seam Mining ◽  
Overburden Strata

There are risks of water burst and sand inrush in the working face of the Northwest Mining Area in China. Based on the 22407 working face of Halagou coal mine, the evolution characteristics and mechanism of a two-zone failure mode of the overburden strata in shallow buried thick seam mining were thoroughly analysed using physical modelling, theoretical analysis, on-site observation, and other research methods. A method to calculate the overburden fissure width was also proposed. The analysis results indicated that the evolution of a two-zone failure mode of the overburden strata mainly includes four stages: gestation, formation, transformation, and stabilization. In the transformation stage, a fracture zone is transformed into a caving zone. The caving zone and fracture zone are separately transferred to the working face direction based on the structure type of key strata of voussoir beam and cantilever beam after the heights of the two zones stabilize, and the “two-belt” cracks are mainly composed of inclined and horizontal fissures. Based on this study, the mechanism of the two-zone failure mode of overburden strata development was analysed according to the mining height and overburden strata key layer structure. This paper serves as a guide for safe and green mining on shallow buried thick seams.

Analysis of Three-Dimensional Numerical Simulationin Rlue of the Migration Rule of Overlying Strata in Thick Seam Mining with Soft of Daping Mine

2013 ◽  
Vol 718-720 ◽  
pp. 1934-1937
Author(s):  
Meng Lin Xu ◽  
De Shen Zhao
Keyword(s):  
Theoretical Analysis ◽  
Coal Seam ◽  
Three Dimensional ◽  
Fissure Zone ◽  
Thick Coal Seam ◽  
Thick Seam ◽  
Soft Coal ◽  
Soft Coal Seam ◽  
Seam Mining ◽  
Overlying Strata

In order to delve better what research methodology of height of water conducted fissure zone are, especially in mining of thick coal seam with soft, 3-D numerical simulationin was used to S2S9 face of Da Ping mine, it reveals the damage movement rule of overlying strata in mining roof-coal in "Three Soft" coal seam in the end . Thus it confirms the height of the water flowing fractured zone and tests the simulation result by the theoretical analysis and simple hydrology observation result. it provides a new idea for the application soft overburden in extra- thick seam mining technology.

Study on Surface Subsidence and Separation Range Thick Seam Mining of Daping Mine

2013 ◽  
Vol 742 ◽  
pp. 268-271 ◽  
Author(s):  
Meng Lin Xu ◽  
Xun Guo Zhu ◽  
De Shen Zhao
Keyword(s):  
Surface Subsidence ◽  
Thick Seam ◽  
Working Face ◽  
Single Face ◽  
High Efficient ◽  
Mining Conditions ◽  
Face Length ◽  
The Face ◽  
Residual Space ◽  
Seam Mining

In order to study the surface subsidence and separation range features during the mining process in in thick seam mining of Daping mine , it takes the typical coal of mining in S2S9 face of Daping Mine, using the resemble simulation to study on it. The study showed that the subsidence amounted to less than the maximum under the geological and mining conditions, In the single-face mining conditions, when the face length is generally not more than (1/3-1/4) H.The mining thickness cannot deflection in the form completely transmitted to the surface, but abound in overburden bed rock mass formed within the fracture and caving into the residual space. This research can be a reference for safety and high efficient coal mining of other working face in Daping Coal Mine.

Simulation and Analysis on Supporting System of Composite Soil Nailing Technology in the Process of Digging

2012 ◽  
Vol 568 ◽  
pp. 66-70
Author(s):  
Bing Guo
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Stress Field ◽  
Displacement Field ◽  
Structural Features ◽  
Design Methods ◽  
Soil Nailing ◽  
Supporting System ◽  
The Real ◽  
Composite Soil Nailing

According to the typical engineering example and the structural features of the supporting system of composite soil nailing technology, the computing mode of deformation of composite soil nailing technology under force is established. Numerical analysis and supervision in the process of construction on composite soil nailing technology are made with the collocation of typical project example. The data of monitoring on the spot and numerical simulation show that the supporting system of composite soil nailing technology meets the requirement of real deformation under force and can simulate the real features of the stress field and displacement field in the process of construction. The design methods meet the requirement of accuracy, and the result presents important technical reference for design and construction of the supporting system of composite soil nailing technology.

Numerical Simulation of Temperature Field of Direct Laser Metal Deposition Shaping Process of Titanium Alloys

2011 ◽  
Vol 295-297 ◽  
pp. 2112-2119
Author(s):  
Yuan Kong ◽  
Wei Jun Liu ◽  
Yue Chao Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Molten Pool ◽  
Three Dimensional ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Forming Process ◽  
Direct Laser

In order to control the thermal stress of forming process, based on “element birth and death” technology of finite element method, a numerical simulation of three-dimensional temperature field and stress field during multi-track & multi-layer laser metal deposition shaping(LMDS) process is developed with ANSYS parametric design language (APDL). The dynamic variances of temperature field and stress field of forming process are calculated with the energy compensation of interaction between molten pool-powder and laser-powder. The temperature field, temperature gradient, thermal stress field and distribution of residual stress are obtained. The results indicate that although the nodes on different layers are activated at different time, their temperature variations are similar. The temperature gradients of samples are larger near the molten pool area and mainly along z-direction. Finally, it’s verified that the analysis results are consistent with actual situation by the experiments with same process parameters.

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.

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