Analyzing The Damage Mechanism Of Surrounding Mass Rock Of Stope Area In High-stress And Studying The Reasonable Recovery Order

High strss area was determined through geological survey in more detail, as well asrealizing the stability of the surrounding rock, collecting the corresponding joint geological dataand arranging the related materials, which made contribution to rock mass classification andsafety factors classification. A new method of stability classification was formed, takinggeological condition and stress situation into account, basing on the superposition of the twoclassifications which has been already applied in Chengchao iron mine-430level as guidingtunnel support. Considering the deficiencies of the existing support methods，Shotcrete rockboltsupport and bolt connecting chain was introduced under complicated geological conditions aswell, such as joints, key blocks, horse and broken rock. Simulation experiment and numericalsimulation were carried out in different support methods. The results showed that Shotcreterockbolt support and bolt connecting chain was the best support method. Field test by recordingtunnel convergence was carried out to verify the applicability of the Shotcrete rockbolt supportand bolt connecting chain supporting method. The record showed tunnel deformation is smallarand more stable in this support method. Meanwhile numerical simulation of different stopingsequence and underground pressure on-line monitoring were taken consideration. The beststoping sequence of numerical simulation is consistent with the on-site stoping sequence andunderground pressure changes stably.Multi-direction measures were carried out to ensure underground mining safety throughengineering stability classification method and numerical simulation of different on-site stopingsequence as macro-guidance, combining with simulation experiment and numerical simulation ofon-site tunnel support as micro-guidance, and underground pressure on-line monitoring.