A roadway driving technique for preventing coal and gas outbursts in deep coal mines

In deep coal mines, coal and gas outbursts are common disasters because of the high in situ stress and high gas pressure in coal seams. To eliminate the outburst risk, gob-side entry driving is proposed during the roadway excavation. To analyse the outburst risk of gob-side entry driving in a coal seam, this study employed an innovative model that incorporates a stress equilibrium equation and gas transport equation. On the basis of numerical simulations, the distribution law of displacement and stress and gas pressure in the solid coal on both sides of the gob were determined. Specifically, the gas content distribution in the solid coal along the gob, and gas emissions law during the excavation with gob-side entry driving technique were measured. Both the R index method and three-parameter index method were used for outburst risk predictions during roadway excavation with gob-side entry driving. Results showed that the surrounding rock stress, coal seam displacement, and gas pressure and gas content all were significantly reduced on both sides of the gob, and both the R index method and three-parameter index yielded values less than the outburst risk critical values. These findings verify that gob-side entry driving is an effective method for outburst-prone coal seam excavation in deep mines.

[1]  Yuanping Cheng,et al.  Methane and coal exploitation strategy of highly outburst-prone coal seam configurations , 2015 .

[2]  Sevket Durucan,et al.  How gas adsorption and swelling affects permeability of coal: A new modelling approach for analysing laboratory test data , 2014 .

[3]  Jianguo Wang,et al.  Evaluation of the non-Darcy effect in coalbed methane production , 2014 .

[4]  Satya Harpalani,et al.  Permeability prediction of coalbed methane reservoirs during primary depletion , 2013 .

[5]  Jiaxiang Chen,et al.  Safety technologies for the excavation of coal and gas outburst-prone coal seams in deep shafts , 2013 .

[6]  Junhui Mou,et al.  Impact of pore structure on gas adsorption and diffusion dynamics for long-flame coal , 2015 .

[7]  Yuanping Cheng,et al.  A numerical model for outburst including the effect of adsorbed gas on coal deformation and mechanical properties , 2013 .

[8]  Yuanping Cheng,et al.  Permeability distribution characteristics of protected coal seams during unloading of the coal body , 2014 .

[9]  Javier Toraño,et al.  Application of outburst risk indices in the underground coal mines by sublevel caving , 2012 .

[10]  Liang Yuan,et al.  Control of coal and gas outbursts in Huainan mines in China: A review , 2016 .

[11]  Ghazal Izadi,et al.  Permeability evolution of fluid-infiltrated coal containing discrete fractures , 2011 .

[12]  Tang Jun,et al.  A study of the principles and methods of quick validation of the outburst-prevention effect in the process of coal uncovering , 2016 .

[13]  Yuanping Cheng,et al.  Model development and analysis of the evolution of coal permeability under different boundary conditions , 2016 .

[14]  Song Weihua,et al.  The characteristic of in situ stress in outburst area of China , 2012 .

[15]  Deqiang Liu,et al.  Experimental study on the influence mechanism of gas seepage on coal and gas outburst disaster , 2012 .

[16]  Derek Elsworth,et al.  Permeability evolution during progressive deformation of intact coal and implications for instability in underground coal seams , 2013 .

[17]  Qian Yin,et al.  Cable-truss supporting system for gob-side entry driving in deep mine and its application , 2016 .

[18]  Bernhard M. Krooss,et al.  Gas permeability measurements on Australian subbituminous coals: Fluid dynamic and poroelastic aspects , 2014 .

[19]  Yuanping Cheng,et al.  A new method for accurate and rapid measurement of underground coal seam gas content , 2015 .

[20]  Xuehua Li,et al.  Failure laws of narrow pillar and asymmetric control technique of gob-side entry driving in island coal face , 2013 .

[21]  Yuanping Cheng,et al.  Square-form structure failure model of mining-affected hard rock strata: theoretical derivation, application and verification , 2016, Environmental Earth Sciences.

[22]  Guojun Liu,et al.  Rapid regional outburst elimination technology in soft coal seam with soft roof and soft floor , 2012 .

[23]  Chen Yujia,et al.  Line prediction technology for forecasting coal and gas outbursts during coal roadway tunneling , 2016 .

[24]  Yuanping Cheng,et al.  The elimination of coal and gas outburst disasters by long distance lower protective seam mining combined with stress-relief gas extraction in the Huaibei coal mine area , 2015 .

[25]  Jiaxiang Chen,et al.  Methane drainage and utilization in coal mines with strong coal and gas outburst dangers: A case study in Luling mine, China , 2014 .

[26]  Yong Chen,et al.  An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving , 2015 .

[27]  Satya Harpalani,et al.  A simplified permeability model for coalbed methane reservoirs based on matchstick strain and constant volume theory , 2011 .

[28]  Ting Ren,et al.  Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties , 2016 .

[29]  Li Ning,et al.  Top-coal deformation control of gob-side entry with narrow pillars and its application for fully mechanized mining face , 2016 .