Measurement and numerical simulation of the stress relaxation zone on the roadway face in coal mine

2010 ◽  
pp. 481-484
Author(s):  
Nie Baisheng ◽  
Zhai Shengrui ◽  
Zhang Ruming ◽  
Jia Chuan ◽  
Zhang Jufeng
Keyword(s):  
Numerical Simulation ◽  
Stress Relaxation ◽  
Coal Mine ◽  
Relaxation Zone

Measurement and numerical simulation of the stress relaxation zone on the roadway face in coal mine

2010 ◽  
pp. 481-484
Author(s):  
Nie Baisheng ◽  
Zhai Shengrui ◽  
Zhang Ruming ◽  
Jia Chuan ◽  
Zhang Jufeng
Keyword(s):  
Numerical Simulation ◽  
Stress Relaxation ◽  
Coal Mine ◽  
Relaxation Zone

Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation

2016 ◽  
Vol 9 (1) ◽  
pp. 47-54
Author(s):  
Jing Shen ◽  
Mingran Chang
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Heat Dissipation ◽  
Spontaneous Combustion ◽  
Oxidation Zone ◽  
Effect Analysis ◽  
Mine Fire ◽  
Nitrogen Injection ◽  
The Difference ◽  
Residual Coal

One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.

Reasonable Entry Layout of Lower Seam in Multi-Seam Mining Based on Numerical Simulation

2013 ◽  
Vol 295-298 ◽  
pp. 2980-2984
Author(s):  
Xiang Qian Wang ◽  
Da Fa Yin ◽  
Zhao Ning Gao ◽  
Qi Feng Zhao
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Coal Seam ◽  
Coal Mine ◽  
Abutment Pressure ◽  
Surrounding Rock ◽  
Geological Conditions ◽  
Seam Mining

Based on the geological conditions of 6# coal seam and 8# coal seam in Xieqiao Coal Mine, to determine reasonable entry layout of lower seam in multi-seam mining, alternate internal entry layout, alternate exterior entry layout and overlapping entry layout were put forward and simulated by FLAC3D. Then stress distribution and displacement characteristics of surrounding rock were analyzed in the three ways of entry layout, leading to the conclusion that alternate internal entry layout is a better choice for multi-seam mining, for which makes the entry located in stress reduce zone and reduces the influence of abutment pressure of upper coal seam mining to a certain extent,. And the mining practice of Xieqiao Coal Mine tested the results, which will offer a beneficial reference for entry layout with similar geological conditions in multi-seam mining.

Study on the Residual Coal Distribution and the Improving Measures

2014 ◽  
Vol 556-562 ◽  
pp. 822-825
Author(s):  
He Bing Luan
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Production System ◽  
Recovery Rate ◽  
Distribution Characteristics ◽  
The Core ◽  
Residual Coal ◽  
Core Problem

The core problem of fully mechanized top-coal caving technology is to accurately grasp residual coal distribution characteristics and improve the recovery rate to the highest possible. Based on the top-caving working site in some coal mine, combined with the numerical simulation on the residual coal in end roadway, the distribution of residual coal is analyzed. Corresponding improvements on the production system have been proved to be efficient for recovering the residual coal.

The Design and Analysis of Bracket of Scraper Part of Coal Mine Underground Horizontal Extension Transfer Machine Based on Solid Works

2013 ◽  
Vol 791-793 ◽  
pp. 762-765
Author(s):  
Ping Huai Mao ◽  
Li Ding ◽  
Jing Xi Li
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Optimization Design ◽  
Solid Works

The paper aims to design a kind of bracket of scraper part of coal mine underground horizontal extension Transfer Machine perfectly, based on Solid Works. And we would like to perform numerical simulation for the bracket, furthermore to optimize the transect parameters and achieve that to reduce the weight of the bracket. At last, through optimization design, we prefer to reduce 4.5% in Von Misses press and 15% in weight. In this way, we can offer a useful reference to design the bracket of scraper part of coal mine underground horizontal extension Transfer Machine.

Dynamic numerical simulation of coal mine fire for escape capsule installation

2012 ◽  
Vol 50 (4) ◽  
pp. 600-606 ◽  
Author(s):  
Shengzhu Zhang ◽  
Zongzhi Wu ◽  
Rui Zhang ◽  
Jianning Kang
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Mine Fire ◽  
Dynamic Numerical Simulation ◽  
Coal Mine Fire
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