Analysis on intelligent construction process and key technologies of mechanical rock breaking for freezing vertical shaft in coal mines
At present,the construction of shafts is mainly based on the drilling and blasting method,and the short-section digging and lining technology for shaft sinking is gradually maturing.The depth of shaft construction has exceeded 1000 meters and is approaching 1500 meters.However,the drilling and blasting method for shaft sinking is facing the practical challenges such as multiple operators working underground,harsh working environments,high operational risks,and low levels of equipment intelligence.The intelligent construction technology for non-blasting rock breaking in shafts is a promising direction for the development of coal mine shaft construction technology.In order to explore new ideas for efficient intelligent construction technology for mechanical rock breaking in western water-rich soft ground shafts,research has been conducted on the intelligent construction technology and key technologies of mechanical rock breaking in frozen shafts from four aspects:shaft construction technology,geological support technology,intelligent drilling equipment,and collaborative operation technology.Based on the concept of rapid construction of multiple processes in parallel in the shaft,the problem of groundwater inrush and instability in soft ground is solved by using ground freezing technology.The core equipment for mechanical rock breaking drilling is the raise boring machine and the vertical shaft boring machine,and a new process for intelligent construction of mechanical rock breaking in frozen shafts is proposed.The shaft construction process of"freezing+raise boring+permanent support"is proposed,the feasibility of using raise boring machines for drilling in frozen strata is analyzed,and nine key technologies related to frozen wall control,reaming drilling,and rapid support in raise boring machines drilling in frozen strata are discussed.The shaft construction process of"freezing+shaft heading machine drilling+drilling-supporting parallel operation"is proposed,the feasibility of using vertical shaft boring machines for drilling in frozen strata is analyzed,and nine key technologies related to wellbore stability control,intelligent rock breaking drilling,and drilling and support coordination in vertical shaft boring machines drilling in frozen strata are discussed,with the aim of promoting the development of safe,fast,green,and intelligent construction technology for frozen shafts.
mine constructionvertical shaftmechanical rock breakingraise boring machineshaft boring machine
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