A Study on the Roof Fracture Mechanism of Large Cutting Height Workface in Shallow Thick Coal Seam

Abstract:

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Based on the high mining height of large cutting height workface in shallow thick coal seam and the few falling waste rock in goaf, the key roof can not be supported effectively, the facture mechanical model of key roof was established. The theoretical calculation formula of key stratum fracture step and working resistance of support were obtained by using fracture mechanics. The results show that the fracture step of key roof relate to not only the mechanical character of key roof and the load of overlaying rock seam, but also the working resistance of support and horizontal pressure in key roof. The reasonable working resistance of support and the step of roof fracture were analyzed in 1-2coalmine 51104 face of a mine in Dongsheng area. The theoretical results are well agreeable with the field measured results.

Info:

Periodical:

Advanced Materials Research (Volumes 347-353)

Edited by:

Weiguo Pan, Jianxing Ren and Yongguang Li

Pages:

183-188

DOI:

10.4028/www.scientific.net/AMR.347-353.183

Citation:

P. W. Xing et al., "A Study on the Roof Fracture Mechanism of Large Cutting Height Workface in Shallow Thick Coal Seam", Advanced Materials Research, Vols. 347-353, pp. 183-188, 2012

Online since:

October 2011

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Price:

$38.00

[1] Qian Minggao, Shi Pingwu. Underground pressure and rock stratum control[M]. Xuzhou: China University of Mining Technology Press, 2003: 280-293.

[2] Song Zhenqi. Practical underground pressure and control[M]. Xuzhou: China University of Mining Technology Press, 1995: 174-230.

[3] Chen Zhonghui, Xie Heping, Li Quansheng. Study on plate group mechanical modle for main roof of longwall face [J]. Journal of China Coal Society, 2005, 30(2): 172-176.

[4] Feng Zhengchao, Zhao Yangsheng. Control effect of fissure scale on deformation and failure of rock mass[J]. China Journal of Rock Mechanics and Engineering , 2008, 27(1): 78-83.

[5] Hou Zhongjie. The criterion on determining main roof in breaking zone and its application to the shallow seam[J]. Journal of China Coal Society, 2003, 28(1): 17-20.

[6] Huang Qingheng. Ground pressure behavior and definition of shallow seams[J]. Chinese Journal of Rock Mechanics and Engineering , 2002, 21(8): 1 011-1 015.

[7] Yu Xiaozhong, Jiao Changxin, Zhou Qunli. Rock and concrete fracture mechanics[M]. Changsha: Central South University of Technology Press, 1991: 230-278.

[8] Qiu Chongguang, Lv Yunbing, Zhang Hanxing. Rock and concrete fracture mechanics[M]. Wuhan: Science Press, 1991: 36-66, 81-105.

[9] Hou Zhongjie, Zhang Jie. Criterion of broken and limit stride calculation in shallow coal seam coved with thick loose layer[J]. Journal of Liaoning Technical University, 2004, 24(5): 57-62.

[10] Song Xuanmin. Effects of increasing working face's length on underground pressure behaviors of mining super-high faces under shallow coal seam[J]. China Journal of Rock Mechanics and Engineering , 2008, 26(2): 4007-4012.

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