Behavior Regularity of Dynamic Pressure based on Three-zone Structure Loading Theory for a Typical Mine

Abstract

In terms of problems concerning safety production caused by strata behaviors in the process of digging on working face 31102 in a certain mine, the author tries to find its behavior regularity of dynamic pressure by theoretical study, field observation and practical analysis. Through dynamically analyzing deformation and failure process of surrounding rock and theoretically analyzing rule of broken and evolution of overlying rock and stress distribution based on three-zone structure loading theory, it is concluded that: First, when the thickness of immediate loading zone on 31102 working face is 60-70m, its influence distance in advance is 30-40m. The periodicity is short. When the height of delay loading zone is 280-320m, the distance is 150-170m. The periodicity is long. Second, The roof movement in low position of the working face determines the intensity of its strata behaviors. Third, the relation between digging speed of working face and energy release of overlying rock’s fracture is obtained, which is that as the digging speed gets faster, the energy and frequency of microseismic events appears liner growth. These research achievements have been applied to testing mines and the effect turns to be good.