Research on the Control Technology of Open Roadway in the Deep Area with Broken Peripheral Rock
During the excavation of+320 transport contact road,the broken perimeter rock section will be exposed,which is affected by the unfavourable factors of ground stress,tectonic stress and broken perimeter rock,resulting in a larger amount of deformation of the perimeter rock of the transport contact road,and the difficulty of the perimeter rock support is high.Combined with the site conditions of the+320 transport contact lane and based on the principle of pressure support,it is proposed to use anchor net spray+anchor cable,steel frame shed,and post-wall grouting support at intervals,in which the steel frame shed support lags behind the anchor net spray+anchor cable support by 7 d,and the post-wall grouting support lags behind the steel frame shed support by 20 d.This can release the peripheral rock stress,reduce the difficulty of peripheral rock control,and increase the effect of peripheral rock control by allowing part of the peripheral rock to be deformed.After the field application,the deformation of the perimeter rock during the broken perimeter rock section of+320 transport contact roadway is within the permissible range and the deformation amount is small,in which the top and bottom plates and the roadway gangs are 57 mm and 66 mm respectively,which indicates that the perimeter rock control technology adopted on the site realises effective control of the deformation of the broken perimeter rock roadway in the deep area and provides experience for the perimeter rock control of the roadway in the subsequent mines under other similar conditions.
deep areaopen roadwayactive supportsteel frame shed supportpost-wall grouting deep area fractured
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