Study on Rapid Holing-Through Technology of High Cutting Height Coal Mining Face During Terminal Mining Stage

In order to realize rapid and successful holing- through of dismantling channel in high cutting coal mining face during terminal mining stage, based on N 0.42301 Coal Mining Face of Wanli No. 1 Mine as an engineering background, mine pressure observation and roof control measures were conducted at the mining ter minal period to avoid periodic weighting during the dismantling channel holing- through period. Based on the circumstances, an optimization was conducted on the steel mesh setting technique, a steel mesh setting time was reduced and a technical protection could be provided to the safety and rapid dismantling channel holing- through protection. The practice results showed that the holing- through time of the coal mining face was highly reduced and the total dismantling channel holing- through proce ss was only 32 h. The site multi frequent measuring roof and floor elevation method was applied to ensure the roof and floor leveling during the holing- through period a nd to reduce an elevation difference from 2700 mm to below 200 mm. Thus the holing- through quality of the dismantling channel would be high and there were only th e floors of 20 set powered supports with a stage elevation difference of 200 mm. The mine strata pressure monitoring and measuring means and the roof control measu res were applied to ensure the coal mining face free from the mine strata pressure influences during the mining terminal period and to ensure successful and safety holi ng- through of the dismantling channel.