Abstract
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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
Submitted: December 17, 2012
Accepted: February 01, 2013
Published: June 10, 2013 |
Abstract:
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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.
Key words: Fracture toughness, pre-blasting, steep thick seam, top-coal mechanized caving, , ,
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Cite this Reference:
Shu-Ren Wang, Xing-Ping Lai and Peng-Fei Shan, . Analysis of Pre-Blasting Cracks in Horizontal Section Top-coal Mechanized Caving of Steep Thick Seams. Research Journal of Applied Sciences, Engineering and Technology, (02): 249-253.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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