Application of Hydraulic Tension Cracking Excavation Method in Semi Coal Rock Roadway Excavation
Aiming at the complex geological conditions in the eastern area of Xinzhi Coal Mine,there is a significant difference in the layers between the constructed track main roadway and belt main roadway.In design,it is often necessary to construct a connecting roadway with relatively smaller cross section and relatively shorter length between the two main roadways as a return air,pedestrian,or material transportation channel.The traditional blasting excavation method is not suitable due to reasons such as policy influences and difficult safety control and so on.The fully mechanized excavation method is restricted by the objective conditions of the roadway and can not give full play to its mechanical advantages,by taking advantage of the fact that the relatively softer coal seams in the cross section are easier to artificially create sufficient volley surfaces or free surfaces,a hydraulic tension cracking excavation method is proposed for construction.The results show that using hydraulic tension cracking excavation method to excavate in coal bearing rock roadways with rock layers accounting for more than 4/5 of the semi coal rock roadway or roadway cross section,the single entry level meets the requirements and greatly reduces the labor intensity of workers.
万方数据
维普
