Patent ID: 11879336
Assignee: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 19:
20. The monitoring method according to claim 19, wherein in the step S3, the time of the monitoring hole starting to drill is after that a distance between a coal working face and the monitoring hole is L1+D and before that a distance between the coal working face and the monitoring hole is D,
wherein a calculation formula of L1 is as follows:, L
   1
  
  =
  
   h
   
    tan
    ⁢
      
    α
   
  
 

a calculation formula of D is as follows:, D
  =
  
   
    v
    1
   
   ×
   
    
     H
     m
    
    
     v
     2
    
   
  
 

wherein, L1 is a fracture influencing distance, with a unit of m; h is a mining depth, with a unit of m; α is a fracture influencing angle, with a unit of °; D is a coal bed footage during hole drilling, with a unit of m; Hm is the drilling depth of the monitoring hole, with a unit of m; ν1 is an average daily footage of coal mining, with a unit of m; and ν2 is an average daily drilling depth, with a unit of m.