The Zonal Disintegration Law within Coal in Front of Working Face in Deep Coal Mine

Abstract:

The mining coal in the front of long wall face consists of elastic zone, plastic zone and fracture zone. Based on the research of zonaldisintegration of surrounding rock mass in deep tunnel, the zonal disintegration phenomenon of deep coal mine was analyzed by using the theoretical analysis method. On the basis of the Griffith theory, the internal and external boundary formulas of fracture zone and the mechanical criteria of zonal disintegration were obtained. The research shows that the essence of zonal disintegration is the tensile failure and brittle tension crack failure under the abutment pressure, the main influence factors of the width variation of fracture zone are original rock stress and un-axial tensile strength of coal.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 1082-1089
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.1082
• Online since: August 2013
• Authors: Qing Feng Chen, Zhong Hui Chen, Ning Ma, Wei Zhang, Hui Li
• Keywords: Abutment Pressure, Deep Coal Mine, Theoretical Mechanics, Zonal Disintegration

References

[1] Qihu Qian, Shuchen Li . A review of research on zonal disintegration phenomenon in deep rock mass engineering[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(6): 1278–1284. (in Chinese).

[2] CLOETE D R, JAGER A J. The nature of the fracture zone in gold mines as revealed by diamond core drilling[R]. [S. l. ]: Association of Mine Managers, (1972).

[3] Mingyang Wang , Hua Song , Daliang Zheng , et al. On mechanism of zonal disintegration within rock mass around deep tunnel and definition of"deep rock engineering"[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(9): 1771–1776. (in Chinese).

DOI: 10.1201/b11646-36

[4] Chun'an Tang , Yongbin Zhang . Discussion on mechanism and evolution laws of fracture spacing in rock mass[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(7): 1362-1369. (in Chinese).

[5] Yongnian He , Houquan Zhang . Discussion on theory and practice of zonal disintegration in surrounding rocks of deep roadways[J]. Chinese Journal of Geotechnical Engineering, 2008, 27(11): 2369-2374. (in Chinese).

[6] Xin Tang , Yishan Pan , Mengtao Zhang . Mechanism analysis of zonal disintegration in deep level tunnel[J]. Journal of Geological Hazards and Environment Preservation, 2006, 17(4): 80–84. (in Chinese).

[7] Hua Song, Xinhong Wang, Mingyang Wang. Zone deformation mechanism of rock mass around deep underground tunnel[J]. Journal of PLA University of Science and Technology(Natural Science Edition), 2007, 8(3): 274-278. (in Chinese).

[8] Meichun Liao, Zhikun Guo , Feng Liu , et al. Determination of the specimen size for model experiment on zonal fracturing of deeprock mass[J]. Journal of Disaster Prevention and Mitigation Engineering, 2006, 26(1): 58–62. (in Chinese).

[9] Xiaoping Zhou, Qihu Qian. Zonal fracturing mechanism in deep tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(5): 877–885(in Chinese).

[10] Fuqiang Gao, Hongpu Kang , Jian Lin , Numerical simulation of zonal distrigation of surrounding rock mass in deep m ine roadways [J]. Journal of China Coal Society, 2010, 35(1): 21-25(in Chinese).

[11] Jincai Gu, Leiyu Gu , Anmin Chen, et a. lModel test study on mechanism of layered fracture within surrounding rock of tunnels in deep stratum[ J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(3): 433-438.

[12] Minggao Qian , Pingwu Shi. Mining pressure and strata control[M]. Xu zhou: China University of Mining & Technology Press, 2003. 107-109. (in Chinese).

[13] Jinhai Liu, Fuxing Jiang , Naiguo Wang , Zhiguo Zhang , Survey on abutment pressure distribution of fully mechanized caving face in extra-thick coal seam of deep shaft[J]. Journal of China Coal Society, 2011, 36(s1): 18-22(in Chinese).

DOI: 10.1109/icmt.2011.6002055

[14] Fuxing Jiang , Jinhai Liu, Ping Wang , Model of coal burst and instability based on Druker-Prager yield criterion [J]. Journal of China Coal Society, 2011, 36(5): 727-731(in Chinese).

[15] Jiangong Chen, Chenghua Zhu, Yongxing Zhang, Elastic-plastic-brittle analysis of zonal disintegration within rock mass in deep tunnel[J]. Journal of China Coal Society, 2010, 35(4): 541-545(in Chinese).