Application of top-cutting pressure relief blasting technology in gob-side entry retaining
Under the traditional mining mode of coal pillar protection roadway,it is easy to cause unstable roadway deforma-tion,stress concentration,tight working face replacement and low coal recovery rate.In order to maintain the stability of the roadway,solve the tense situation of mining substitution,and promote the efficiency of coal mine,the technology of top cut-ting blasting pressure relieving goaf-along roadway are adopted in the air intake channel of 2601 fully mechanized mining face in Chensilou mine,and the combined support technology are used to analyze and determine the slit parameters and blasting process parameters with successfully application in the production.Comparing with the deformation of surrounding rock of the air intake channel and the untreated return air channel,it is concluded that the deformation of the air intake channel and surrounding rock in the stress range of the intake channel is significantly weakened after the top cutting pres-sure relief and pre-split blasting,and the stress of the intake channel is 46.90％lower than that of the untreated return channel.Compared with the flow of the roof and floor and the two-side return air roadway,the flow is reduced by 82.71％and 74.11％.A large number of data show that the top-cutting pressure relief presplit blasting technology can effectively block the stress transfer,reduce the stress accumulation in the surrounding rock,and effectively control the stability of the roadway.The stability of the roadway is effectively maintained,which is conducive to the realization of safe and efficient coal mine production.
万方数据
维普
