Improving Speed of Machine Digging in Hard Rock Roadway

In order to improve the heading speed in hard rock roadway，taking the auxiliary haulage roadway of 80 mining area in Wuyang Mine as the study object, the study analyzes the present status as well as the problem of the hard rock roadway heading and finds the methods and technology ways for raising roadway machine excavating speed. The method and technology way is that changing the condition of rock by using of ultra-deep hole blasting before excavation roadway by using of high performance roadheader. The design on the ultra-deep hole blasting scheme and blasting parameters are accomplished. The engineering application show that under the condition of the roadway with a cross section of 21.6 m² and the rock Protodyakonov coefficient is greater than 14，the average daily heading rate increases from 2.7 m to 5.08 m and heading speed increased by 87.5％ after the ultra-deep hole blasting．Thus the heading speed of the hard rock roadway is effectively improved．