关键词: 无底柱分段崩落法, 损失与贫化, 结构参数, 覆盖层

Abstract: It is safe in production,have high mining intensity,high efficiency and a simple recovery process in non-pillar sublevel caving,which occupies a large proportion in underground mining.However,the problem of large loss and dilution limit the application of this method in precious metal mines,which is a research hotspot of many scholars.This study summarizes the 60 year development process of non-pillar sublevel caving method,and systematically summarizes the study status of control loss and dilution from the four aspects,including ore drawing theory,stope structure parameters,ore drawing method and roadway layout form,and overburden layer.Only the flowing characteristics of granular is considered in the ore drawing theory,and the factors such as blasting block size,ore drawing port size,side hole angle,and shovel depth are not included in the ore drawing theory.The stope structure parameters determined according to the shape of ore drawing of drawing theory,which cause stope structure parameters are not optimal parameters.In actual production,the low-dilution ore drawing method is not strictly followed,and the layout of the mining roadway cannot fully adapt to the changes in the shovel loading of the ore body,and the formation method of overburden layer is not conducive to loss dilution control in some mines.In view of these problems,the study direction and measures to further control the non-pillar caving method are put forward,which has theoretical guiding significance for the production mine to further control the loss and dilution indexes.