Comprehensive Failure Prevention Technology of Mine Shaft Ingate Construction in Deep and Thick Seam
WANG Shi-chun
FAN Ju-chao
CHEN Yun
Abstract：A mine auxiliary shaft ingate of Mengcun Mine was located in a deep and thick seam.In order to prevent deformation failures occurred after the construction of the mine shaft ingate ,with a simula-tion experiment ,a suitable structure shape---a horseshoe reversed floor arch was selected.A primary support was a bolt/steel mesh/shotcrete + anchor ,could enhance a self loading capacity of the sur-rounding rock and could reduce the load on the roof and sidewall of the chamber.A permanent support was a site pouring reinforced concrete liner.An excavation and lining construction was conducted in section ,the main part of the project was conducted first and the subsidiary part of the project was con-ducted second.T hus the failure of the surrounding rock caused by a large cross section excavation could be reduced.A preset grouting pipe at a location of freezing pipe passed through the ingate was applied to the grouting and water sealing to isolate a water connection between the ingate and the ex-ternal annular space of the freezing pipe ,to eliminate the water pressure effect to the ingate and to re-duce the load on the ingate.After the ingate construction completed ,a site deformation and failure ob-servation with a period of two years was conducted ,there was no floor heave ,roof subsidence or side-wall displacement occurred ,the stability of the ingate was excellent and the expected effect was reached.
Keywords：deep and thick seammine shaft ingatefailurefull depth freezinggrouting
Publication Date：2014-02-22
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 17-20 )