Akademik Veri Yönetim Sistemi
Geomechanics and Geophysics for Geo-Energy and Geo-Resources, cilt.7, ss.1-15, 2021 (SCI-Expanded)
To eliminate roof-control disasters typically
encountering in mines with thick and hard rock strata, fracture
characteristics, instability mechanism and prevention methods were investigated
in the study. A mine stope with thick and hard main roof and wedge-structure
immediate roof in Zhuxianzhuang Coal Mine was taken as the background. In terms
of the strata behaviors and roof control difficulty levels via physical
simulations, mining zones were classified into strong pressure behavior zone,
less-strong pressure behavior zone and pressure mitigation zone. Theoretical
analysis was used to study the interaction characteristics of the
support-surrounding rock under different mining zones and the principles and
methods of zonal control under THR were proposed. A coordinated control method,
which combined confined blasting in water-filled deep holes for reducing the
roof fracture size and reasonable support optimization for increasing the
supporting intensity, was applied to the strong pressure behavior zone and
less-strong pressure behavior zone. The mechanical calculation model of a
“presplit-THR-block–immediate-roof-top-block–top-coal-wall–hydraulic-support”
system was established, which determined the length of confined blasting blocks
as 20–25 m and supporting intensity as 1.15–1.28 MPa. These parameters can
satisfy the requirements of THR control and lead to the best economic
performance.