Loading State and Characteristic Analysis of Quasi-Static Stress Fieldon Coal Seam Pre-splitting Blasting

摘要

Pre-splitting blasting in coal seam can come into being plentiful cracks that is most important for improving the effect of methane extraction. Combining ventage stress concentration theory with thick cylinder principle, this paper analyzed detailedly the characteristics of various stress basing on elasticity mechanics. The results showed that the distributing characteristics of radial stress, tangent stress and sheafing stress around explosion cavity are distinct. Such a study will be significant not only for parameter design during gas exhaust project, but also for perfecting more the theory of pre-splitting blasting in coal seam.