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The Scientific World Journal
Volume 2014, Article ID 714507, 8 pages
http://dx.doi.org/10.1155/2014/714507
Research Article

Deformation Failure Characteristics of Coal Body and Mining Induced Stress Evolution Law

1State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, Shandong 266590, China
2Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, China
3Aalto University, 00076 Aalto, Finland

Received 23 March 2014; Accepted 29 April 2014; Published 19 May 2014

Academic Editor: Guojie Zhang

Copyright © 2014 Zhijie Wen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The results of the interaction between coal failure and mining pressure field evolution during mining are presented. Not only the mechanical model of stope and its relative structure division, but also the failure and behavior characteristic of coal body under different mining stages are built and demonstrated. Namely, the breaking arch and stress arch which influence the mining area are quantified calculated. A systematic method of stress field distribution is worked out. All this indicates that the pore distribution of coal body with different compressed volume has fractal character; it appears to be the linear relationship between propagation range of internal stress field and compressed volume of coal body and nonlinear relationship between the range of outburst coal mass and the number of pores which is influenced by mining pressure. The results provide theory reference for the research on the range of mining-induced stress and broken coal wall.