上向分层充填采矿法尾砂充填体沉缩变形试验研究

尾砂充填体沉缩变形量较大且难于确定。基于大尹格庄金矿水砂充填生产实践,在室内试验测定分级尾砂粒级组成、孔隙率、载荷作用下沉缩变形量的基础上,通过采场内尾砂充填体厚度计算、回采作业前后充填面标高等参数的计算,推算出尾砂充填体最终沉缩率为11.6%。试验结果可为尾砂充填采场的清底标准提供依据,并根据生产需要适当采用胶结充填方式减少采矿贫化损失。

Experimental study on the shrinkage deformation of the tailings filling body in upward slicing and filling method

The shrinkage deformation of the tailings filling body is large and difficult to determine.Based on the production practice of water and tailings filling in Dayin`gezhuang gold mine and according to the determination of the particle size distribution of classified tailings,the porosity and the shrinkage degree under load,the paper calculated the filling body`s thickness and the elevation of the filling face before and after extraction in the stope and concluded that the final shrinkage rate of tailings filling body was 11.6 %.The results can provide the basis for the bottom cleaning in tailings-filled stopes.The method can be supplemented by cement filling,if required by production,to minimize mining loss and dilution.