ZhangJun

In order to ensure the quality and safety of highway mountain tunnel construction and to solve the problem of limited construction schedule of long tunnels，it is proposed to use mechanized construction combined with smooth blasting method to achieve safe and reliable tunnel construction. In view

In Chambishi Copper Mine in Zambia, large scale trackless equipments are used and the section size of roadway and stope is large. In order to exert the advantage of high efficiency of the large scale trackless equipments, increasement of advance per attack of roadway drivage is required.