Research and Application of Slotting and Directional Blasting Technology for the Shrinkable Layer of Vertical Well Wall
The main well of Chensilou Coal Mine adopts a double-layer reinforced concrete composite well wall structure.The shaft passes through an alluvial layer with a thickness of 368 m.Due to the fracture of the surface soil section well wall,there is a significant safety hidden danger to the safe use of the shaft.The renovation of the well wall method is used for restore and administer,releasing the energy accumulated in the well wall,which can effectively achieve the purpose of preventing and controlling the well wall fracture disaster.However,during the slotting period of the shaft well wall,there is a risk of water and sand inrush from the well wall,the difficulty of shaft restore is to slot the well wall.This article takes the restore of the main well of Chensilou Coal Mine as an example,and adopts a construction scheme of"directional blasting+manual demolition"for well wall slotting.By dividing the blasting area,optimizing blasting parameters and operation sequence,the impact of blasting on the outer well wall and upper and lower inner well walls of the slotting parts is reduced,achieving the effect of preserving the integrity and stability of the well wall and the integrity of the slotting boundary.
well wall fracturerenovation of well wallwell wall slottingdirectional blastingblasting areablasting parameter
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