Mechanical Analysis of Shell Structure in Longwall Mining Face of Steeply Dipping Seam

Abstract:

Taking the longwall mining face area in steeply dipping seam as the research object, the stability of asymmetrical rock mass structure is analyzed using shell theory and masonry beam theory. The results show that asymmetrical shell structure is formed at the top strata of mining stope and its magnitude is mainly determined by the mechanical characteristic of overburden strata of working face, mining space size and so on. Localized instability of the shell structure is the main factor that leads to the overall structural instability in the stope. The instability modes includes: the shell roof instability dominated by tensile failure, shell shoulder instability initialized by compression-shear failure, and shell bases composite instability occurs in tensile and compression-shear modes. The shell structure stability dedicates rational strata control measures to choose, and the caving height of overburden strata is the key for shell structure instability.

• Periodical: Applied Mechanics and Materials (Volumes 501-504)
• Pages: 1820-1826
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.501-504.1820
• Online since: January 2014
• Authors: Shi Guang Ren, Yong Ping Wu, Pan Shi Xie
• Keywords: Shell Structure, Stability of "Rock-Support" System, Steeply Dipping Seam

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