Design of gas drainage modes based on gas emission rate in a gob: a simulation study

2018 ◽  
Vol 11 (16) ◽  
Author(s):  
Xiaowei Li ◽  
Chaojie Wang ◽  
Yujia Chen ◽  
Jun Tang ◽  
Yawei Li
Keyword(s):  
Simulation Study ◽  
Emission Rate ◽  
Gas Emission ◽  
Gas Drainage

scholarly journals Study on Gas Emission Rate Prediction Based on Chaos Analysis

2011 ◽  
Vol 24 ◽  
pp. 106-110 ◽  
Author(s):  
Liu Yang ◽  
Shi Qingjun ◽  
Li Jing ◽  
Ma Huibin ◽  
Liu Desheng
Keyword(s):  
Emission Rate ◽  
Gas Emission ◽  
Chaos Analysis ◽  
Rate Prediction

scholarly journals Study on Optimization of Gas Drainage Methods in High-burst Mines

2019 ◽  
Vol 118 ◽  
pp. 03034
Author(s):  
Fengfeng Yang ◽  
Dongfang Gao ◽  
Jufeng Zhang ◽  
Kezhen Zhao ◽  
Tai Xu ◽  
...  
Keyword(s):  
Coal Mine ◽  
Extraction Method ◽  
Gas Extraction ◽  
Gas Emission ◽  
Gas Drainage ◽  
Composition Ratio ◽  
Gas Outburst ◽  
Actual Production ◽  
Extraction Parameters ◽  
Production Conditions

After the mechanization upgrade of Yongjing Coal Mine, the original extraction method cannot solve the problem of gas. According to the actual production conditions of the mine, the source and composition ratio of gas emission are analyzed.By combining with the gas extraction method before upgrading and transformation, it is of great importance to determine the appropriate comprehensive gas extraction method and optimize the gas extraction parameters for improving the gas extraction effect and eliminating the risk of gas outburst.

Prediction of mine gas emission rate based on the SVM model

2008 ◽  
Author(s):  
Wang Jianping ◽  
Huang Hongxia ◽  
Li Hongbiao ◽  
Zhang Yunsheng
Keyword(s):  
Emission Rate ◽  
Gas Emission ◽  
Svm Model ◽  
Mine Gas

scholarly journals Field testing two flux footprint models

2021 ◽  
Vol 14 (11) ◽  
pp. 7147-7152
Author(s):  
Trevor W. Coates ◽  
Monzurul Alam ◽  
Thomas K. Flesch ◽  
Guillermo Hernandez-Ramirez
Keyword(s):  
Field Study ◽  
Release Rate ◽  
Emission Rate ◽  
Dispersion Model ◽  
Field Testing ◽  
Gas Emission ◽  
Flux Footprint ◽  
Model Calculations ◽  
Area Source ◽  
Large Period

Abstract. A field study was undertaken to investigate the accuracy of two micrometeorological flux footprint models for calculating the gas emission rate from a synthetic 10 × 10 m surface area source, based on the vertical flux of gas measured at fetches of 15 to 50 m downwind of the source. Calculations were made with an easy-to-use tool based on the Kormann–Meixner analytical model and with a more sophisticated Lagrangian stochastic dispersion model. A total of 59 testable 10 min observation periods were measured over 9 d. On average, both models underestimated the actual release rate by approximately 30 %, mostly due to large underestimates at the larger fetches. The accuracy of the model calculations had large period-to-period variability, and no statistical differences were observed between the two models in terms of overall accuracy.

scholarly journals Dependence of gas emission from the sources undermined by stope mine workings on the rocks displacement parameters

2018 ◽  
Vol 60 ◽  
pp. 00019
Author(s):  
Mykhailo Filatiev ◽  
Elvira Filatieva ◽  
Mykola Antoshchenko
Keyword(s):  
Main Roof ◽  
Earth Surface ◽  
Gas Emission ◽  
Gas Drainage ◽  
The Earth ◽  
Coal Deposits ◽  
Maximum Subsidence ◽  
Mine Workings ◽  
First Time ◽  
Positive Results

The parameters are established in the work of the stope mine workings and rocks displacement, which correspond to the maxima of gas emission into the gas drainage boreholes. The angular and linear parameters of the crustal movement and rocks displacement have been calculated with the use of empirical dependences. These parameters correspond to the maxima of gas emission into the gas drainage boreholes. The obtained positive results for determining the possible areas of maximum gas emission allow us to recommend the empirical dependences for calculating the angles of maximum subsidence and complete displacements at the stage of stope works development, as well as the dimensions of the stope mine workings, at which the processes of rocks displacement reach the earth surface. The established relations between the gas drainage boreholes location and the rocks displacement zones with discontinuity make it possible to design the optimal schemes of draining-out of gases from the gas-and-coal deposits. For the first time, three independent methods have been used to determine the changes in dimensions of rocks displacement zones with discontinuity after the primary main roof squeezing until the formation of stable upper boundaries of these zones.

Research on the Characteristics of Gas Geology in Yongshanqiao Mining Area, Jiangxi Province

2012 ◽  
Vol 164 ◽  
pp. 511-516
Author(s):  
Zhi Gen Zhao ◽  
Ming Ming Zhang ◽  
Jia Ping Yan
Keyword(s):  
Emission Rate ◽  
Mining Area ◽  
Geological Structure ◽  
Controlling Factors ◽  
Jiangxi Province ◽  
Coal Seams ◽  
Gas Emission ◽  
Gas Generation ◽  
Coal Quality ◽  
Geological Factors

The coal and gas outburst is very serious in Yongshanqiao Mining Area of Jiangxi province, so it is of significance to research the characteristics of gas geology and their controlling factors. Based on the statistical analysis of gas data during coal exploration and coal mining, the regularity is revealed of the characteristics of gas geology in Yongshanqiao Mining Area. From east to west and from south to north, the relative gas emission rate and the absolute gas emission rate tend to increase, the frequency and intensity of coal and gas outbursts rise, the gas contents also tend to increase. The controlling factors of characteristics of gas geology in Yongshanqiao Mining Area are researched in this paper. The work reveals that: corresponding to characteristics of gas geology, the distribution characteristics of coal quality, the characteristics of geological structure and the lithology characteristics of the roof and the floor of the coal seams in Yongshanqiao Mining Area present regular changes, and are all favorable to gas generation and gas preservation. So, the characteristics of gas geology in Yongshanqiao Mining Area are the result of comprehensive effects by geological factors

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