Study on the Breaking Span and the Influence on Gas Migration in Goaf
Authors
-
National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044 ,CN
Binwei Xia -
National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044 ,CNShijie Guo
-
National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044 ,CNYiyu Lu
-
National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044 ,CNXiaolong Li
-
National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044 ,CNPeng Yu
-
National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044 ,CNJinlong Jia
Keywords:
Hard Roof, Thick Plate Theory, Layered Fracture, Goaf Gas, Dynamic Migration.Abstract
To solve the abnormal gas emission of goaf during the thick coal seam overlying hard roof to pressure on the Tashan coal Mine in Datong, focusing on the hard roof of some working surface in Datong mining, and based the key stratum theory, Vlasov thick plate theory and thin plate theory, this paper gets the breaking span of hard rock strata which are quite different in thickness in a near distance, and explains the stratum caving with different weighting. We established the dynamic, migration model of gas in the mined out area under the impact of collapse according to the characteristics of overlying strata, with the aid of COMSOL multi-physical field coupling software, to analyze the gas emission law in the goaf under the overlying stratum. The result shows that the breaking span of the upper roof is twice longer than the lower one, leading to strong and weak weighting. When the layered roof rock caving, the most of mining goaf gas will be poured into the working face upper corner and the high extracted way. Especially in the upper roof caving, the upper corner gas concentration increases obviously. So the goaf and the upper corner gas should be the focus of governance.
Downloads
Metrics
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
References
Wang H. Y., Cheng Y. F., Yu B. (2015): Adsorption Effect of Overlaying Strata on Carbon Dioxide in Coalfield Fire Area. International Journal of Heat and Technology, 33(3): 11-18.
Yu B. (2014): Study on Strong Pressure Behavior Mechanism and Roof Control of Fully Mechanized Top Coal Caving in Extra Thickness Seam in Datong Coal Mine. Ph.D. dissertation,China University of Mining and Technology,Xuzhou.
Li B. Y., Zhang N. (2014): Stability Analysis and Controlling Scheme Optimization On Roadway Driven Along Goaf of Fully Mechanized Top Coal Caving.Env and Earth Sci Res J, 1(1):17-22.
Meng X. R., Zhang W. C., He Y. Q. (2006): Study of gas emission characteristic in long-wall top coal caving face with a high gas content.Journal of Mining & Safety Engineering,23(4): 419-422.
Wang J. C., Wang Z. H. (2015): Stability of main roof structure during the first weighting in shallow highintensity mining face with thin bedrock.Journal of Mining & Safety Engineering,32(2): 175-181.
Li S.G., Lin H.F., Cheng L.H. (2004): Relation between abutment pressure and relieved gas delivery for fullymechanized top coal caving. Chinese Journal of Rock Mechanics & Engineering, 23(19): 3288-3291.
Jia X. R. (2010): Rock mechanics and rock strata control.Beijing, China: China University of Mining and Technology Press, 258-269.
Tang X. L., Ye M. L. (2003): The Thin Plate Theory Analysis of Hard Roof and Pressure Forecast. West-china Exploration Engineering,(8):67-69.
Tu H. S., Tu S. H., Chen F. Study on the deformation and fracture feature of steep inclined coal seam roof based on the theory of thin plates.Journal of Mining & Safety Engineering, 31(01): 49-55.
Weng M. Y., Xu J. H., Li C. (2011): Relationship of coal and rock damage underground behavior and methane gushing in fully-mechanized caving mining face.Meitan Xuebao/journal of the China Coal Society, 36(10): 1709-1714.
Li H.M., Wang W., Xiong Z. Q. (2008): Relationship between mining induced surrounding rock movement and gas emission in working face.Journal of Mining & Safety Engineering,25(1): 11-16.
Qian M.G., Liao X.X., Xu J.L. (2003): Key strata theory of strata control. Beijing, China: China University of Mining and Technology Press.
He F.B., Shen Y.P. (1993): Theory of plates and shells. Xi’an, China: Xi’an Jiao Tong University Press, 182-187.
Hao T.X., Jin Z.C., Li F. Optimization of Goaf Gas Drainage Parameters Based on Numerical Simulation Studying Fracture in Overlying Strata. Procedia Engineering, 43(9): 269-275.
Al-khliefat V.M., Duwairi H.M. (2015): Darcian velocity and temperature jump effects on convection from vertical surface embedded in porous media. International Journal of Heat and Technology, 33(2): 97-102.
Liang Y.T., Zhang T.F., Wang S.G., Sun J.P. (2009): Heterogeneous model of porosity in gobs and its airflow field distribution. Journal of the China Coal Society, 34(9): 1203-1207.
