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    Abstract
2013 (Vol. 6, Issue: 02)
Article Information:

Analysis of Pre-Blasting Cracks in Horizontal Section Top-coal Mechanized Caving of Steep Thick Seams

Shu-Ren Wang, Xing-Ping Lai and Peng-Fei Shan
Corresponding Author:  Zhixiang Hou 

Key words:  Fracture toughness, pre-blasting, steep thick seam, top-coal mechanized caving, , ,
Vol. 6 , (02): 249-253
Submitted Accepted Published
December 17, 2012 February 01, 2013 June 10, 2013
Abstract:

In order to achieving safe and efficient exploitation in horizontal section top-coal mechanized caving of steep and thick seams, pre-blasting of top-coal is one of the prerequisites and analysis of crack evolution law is a key method to achieving good pre-splitting effects. Based on investigations of coal seams and mining conditions, theories of fracture mechanics were applied to explain the process of caving cracks and fracture toughness of coal seams in preblasting caving were calculated. The distribution of caving cracks was determined with in-situ borehole-wall real deformation optical monitoring systems. The results showed that the pre-splitting crack could rapidly develop in the direction of borehole center line and form the failure surface along the same direction in the last; the fracture toughness of B3 and B6 coal seams was 0.5616 and 1.1900 MPa·m1/2, respectively. The distribution of caving stress from real monitoring instruments provided a theoretical proof for optimizing the parameters of pre-blasting in top-coal safe mining.
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  Cite this Reference:
Shu-Ren Wang, Xing-Ping Lai and Peng-Fei Shan, 2013. Analysis of Pre-Blasting Cracks in Horizontal Section Top-coal Mechanized Caving of Steep Thick Seams.  Research Journal of Applied Sciences, Engineering and Technology, 6(02): 249-253.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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