Methods for assessing effects of longwall mining on surf ace subsidence

Hazen, G. A. ; Sargand, S. M.
Organization: Society for Mining, Metallurgy & Exploration
Pages: 4
Publication Date: Jan 1, 1987
This study monitored longwall mining subsidence profiles over three panels that were mined beneath state highways in southeastern Ohio. The average maximum subsidence was 1.07 m (3.5 ft). The average maximum compressive strain recorded was 0.008 mm/mm. Three predictive methods for the determination of displacements and strains were compared: the National Coal Board (NCB) graphical method, the profile method with empirical constants determined for southeastern Ohio, and a finite element excavation program. Excellent subsidence agreement was found with the profile method, and reasonable strain agreement was determined with the finite element program.
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