Abstract: As Meishan Mining Company has a vertical drop of approximately 350 m from the southeast well to the underground of -303 m,such a high drop conveys the finished concrete,which easily causes the problem of segregation of the concrete,which directly affects the compressive strength and slump of the finished concrete.And the rebound rate of shotcrete support,etc.,causing the pipeline to meet the safety requirements of underground mining production.In order to further improve the safety strength of roadway support,Meishan Iron Mine introduced a new type of cementitious material,water slag micropowder,and used water slag micropowder to replace part of the cement in shotcrete support in order to improve the technical indicators of concrete.Optimize the technical requirements for the material of the southeast well,the installation plan of the pipeline,the layout of the pipeline,the diameter of the pipeline,and the control of the first discharge,etc.,in order to solve the problem of segregating the concrete in advance,and determine the material of the pipeline and the The detailed parameters of the installation plan,the layout of the pipeline,the diameter of the pipeline,and the amount of material to be discharged at one time,and then to explore and optimize the technical parameters of the proportion of the new cementitious material,so that the pipeline can transport the compressive strength,slump and The rebound rate index of shotcrete support meets the design requirements,and the concrete transported by the pipeline meets the safety requirements of underground mining production operations.

Key words: Pipeline,Concrete,Segregation,New cementitious material,Water slag powder,Safety production