分段胶结充填法非胶结充填体顶水高度的力学模型

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

为了预防分段胶结充填过程中非胶结充填体顶水高度过大导致充填挡墙破坏而发生跑浆事故,在满足一定假设条件和必要前提的基础上,建立非胶结充填体顶水高度力学模型,并进行理论求解。以某铁矿充填采场为工程分析实例,采用控制变量法(CVM)研究非胶结充填体顶水高度随充填沉降比和充填挡墙承受荷载的变化规律。结果表明:在充填挡墙承受荷载一定的前提下,非胶结充填体顶水高度随着充填沉降比的增大而不断增大,呈二次多项式关系;在充填沉降比一定的前提下,非胶结充填体顶水高度随着充填挡墙承受荷载的增大而不断增大,呈线性关系。最终得到某铁矿充填采场非胶结充填体安全顶水高度值为2 m,与工程实测结果相同,研究具有一定的工程实用意义。

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.