Mechanical model of water head height of non-cemented backfill in sublevel stoping with cemented filling

To prevent the height of non-cemented filling top water in sublevel stoping with cemented filling being too large to cause slurry overflowing and damage the filling blocking wall, the paper established a mechanical model of non-cemented filling top water height in sublevel stoping with cemented filling and solves it by using theory based on the assumption of elasticity. Taking iron ore for project, the paper applies CVM to study the variation of filling blocking wall carrying load under the conditions of different filling settlement ratio and top water height in whole tailings non cemented filling. The results show that under the premise of certain filling blocking wall height, filling slurry density and top water height, the bearing load of filling blocking wall increases with increase of the filling settlement ratio which is expressed by a quadratic polynomial equation. And under the premise of certain filling settlement ratio, the bearing load increases with the increasing of top water height which is expressed by a linear relationship. The terminal safety top water height of whole tailings non-cemented filling is 2 m in iron ore, which is the same with the result of engineering detection, and the research has some engineering practical significance. © 2021, Science Press. All right reserved.