Stability of Gas Drainage Borehole Analysis on Rock Mechanics Parameters with Roadway of Complex Stress

Abstract:

The pattern of stress redistribution in the effect of circular roadway is analyzed and numerical simulation on stability of gas drainage borehole which is in the area of the stress redistribution was done with FLAC^3D. The model of that circular roadway and gas drainage borehole are perpendicularly crossed is established and compute with the Coulomb Mohr criterion. It can be found that the stress of gas drainage borehole decreases with decreasing of internal friction angle and the cohesion value. The stress of gas drainage borehole steep rises where the distances of away from roadway is two times of the diameter and the stress of horizontal direction are larger than the stress of vertical direction.

• Periodical: Applied Mechanics and Materials (Volume 723)
• Pages: 330-335
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.723.330
• Online since: January 2015
• Authors: Tian Jun Zhang, Lei Zhang, Hong Yu Pan, Chao Zhang
• Keywords: Drainage Borehole, FLAC, Gas Drainage, Numerical Simulation

References

[1] Q.G. Sun. National Institute for Occupational Safety. China Coal. 2014; 40(3): 116-119.

[2] L. Yuan. Key Technique of Safe Mining in Low Permeability and Methane-Rich Seam Group. Chinese Journal of Rock Mechanics and Engineering. 2008; 27(7): 1370-1379.

[3] L.M. Dou, X.Q. He. Coal and Rock Mechanic Features Influencing the Stress Distribution. Journal of Liaoning Technical University (Natural Science Edition). 2001; 20(4): 484-486.

[4] X. Xie. Analysis of Borehole Wall Stability Based on Unified Strength Theory. Meng Thesis. Hang Zhou: Zhejiang University; (2013).

[5] C. Zhang. Research on Instability Mechanism for Sealing Segment of Boreholes and Reinforcing Dynamic Sealing Techniques. PhD Thesis. Beijing: China University of Mining & Technology; (2014).

[6] F.Y. Zhang, Y. Han, and Z.L. Yang. Numerical Simulation of Borehole Failure in Coal Seam. China Mining Magazine, 2013; 22(9): 115-140.

[7] H. Si, T. Guo, and X.H. Li. Analysis and Numerical Simulation of Fluid-Structure Coupling of Gas Drainage from Boreholes. Journal of Chongqing University. 2011; 34(11): 105-110.

[8] M.G. Qian, P.W. Shi: Mine Pressure and Strata control. Xuzhou: China University of Mining and Technology. (2003).

[9] G.Z. Yin, M.H. Li, and S.Z. Li. 3D Numerical Simulation of Gas Drainage from Boreholes Based On Solid-Gas Coupling Model of Coal Containing Gas. Journal of China Coal Society. 2013; 38 (4): 535-541.

DOI: 10.1007/s12404-013-0213-5

[10] Z. Tang, Y.S. Pan, and Z.H. Li. Simulation Analysis of Spatial Distribution of Roadway's Surrounding Rock Stress. Journal of Civil Architectural & Environmental Engineering. 2014; 36(3): 37-42.

[11] L. Yuan: Theory and Technology of Gas Drainage and Capture in Soft Multiple Coal Seams of Low Permeability. Beijing: China Coal Industry Publishing House. (2004).

[12] B.Q. Lin, Q.Z. Li, and W. Yang, etc. Gas Control Technology and Applications for the Three-soft Coal Seam Based on VLD-IO00 Drilling Systems. Journal of China Coal Society. 2011, p. (1968).