Failure Mechanism and Control Techniques of Reused Roadway in an Isolated Coal Barrier Pillar

Abstract:

Reused roadway in double-U shaped layout with an isolated barrier pillar subjects to two adjacent panels mining and has large deformation. In order to keep the reused roadway stable in its service life, numerical simulation, theoretical analysis and field observation were applied to investigate the deformation rule and failure mechanism of surrounding rock during mining period. Research results show that low strength and high stress difference environment is a fundamental reason of shear failure, different loading and unloading path in both ribs of roadway is the primary reason of asymmetric failure, and performance of bolting support is critical for the roadway stability. Therefore, control techniques of reused roadway are put forward that 1) high-strength and yielding bolts support the roof and ribs to adjust to massive convergence of roadway; 2) yielding counter-pulled cables reinforce small-pillar rib to strengthen the stability of samll coal pillar; and 3) hydraulic expansion bolts support the floor. The results have been successfully applied to a field trial.

• Periodical: Applied Mechanics and Materials (Volume 328)
• Pages: 213-218
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.328.213
• Online since: June 2013
• Authors: Shuai Yan, De Yu Chong, Zhi Ting Han, Ji Zhang
• Keywords: Hydraulic Expansion Bolt, Isolated Coal Barrier Pillar, Loading, Reused Roadway, Unloading, Yielding Counter-Pulled Cable

References

[1] N. Ma, C. Hou. Ground control theory and its application for coal roadway. China Coal Industry Publishing House (1995)

[2] J. Bai．Ground control of roadway driven along the previous goaf. China University of Mining and Technology Press (2006)

[3] X. LI, N. ZHANG, C. HOU. Rational position determination of roadway driving along next goaf for fully-mechanized top-coal caving mining. Journal of China University of Mining and Technology. Vol. 29(2000), pp.186-189.

DOI: 10.1201/b11761-34

[4] H. XIE, F. DUAN, H. ZHOU, et al. Recent developments of theory and analysis methods of strip pillar stability. China Mining. Vol. 07(1998), pp.37-41.

[5] T. ZHAO, H. ZHANG, Y. CHEN, et al. Evolution of abutment pressure distribution and impact on coal-rock damage. Journal of Liaoning Technical University(Natural Science). Vol. 29 (2010), pp.420-423.

[6] G. XU, H. JING, S. DING, et al. Evolution rules of stress and displacement for narrow coal pillars between double gob-side entries. Journal of Mining & Safety Engineering.Vol. 27(2010), pp.160-165.

[7] T. WANG, C. LIU, X. WANG. FLAC3D numerical simulation and radar detection of lateral abutment pressure distribution of isolated coal pillar. Chinese Journal of Rock Mechanics and Engineering. Vol. 21(2002), pp.2484-2487.

[8] C. LIU, K. LIU, Y. GUO, et al. Numerical Simulation on roadway protected by wide coal pillar in super-wide and isolated island fully mechanized top-coal caving face. Journal of China University of Mining & Technology. Vol.35(2006), pp.473-477.

DOI: 10.1201/b11761-34

[9] B. Zheng, W. Xie, L. Dou, et al. A surrounding rock controlling technique of roadway affected by dynamic stress in "islet face"of adjacent coal seam. Journal of China Universityof Mining & Technology. Vol. 35(2006), pp.483-487.

[10] L. Zhang. Experimental and Theoretical Study on Macroscopic and Mesoscopic Failure Mechanism of Rock Mass under Loading and Unloading Conditions [Doctor thesis]. (2009).