关键词: 无底柱分段崩落法, 崩落体, 物理模拟, 数值模拟, 放矿

Abstract: The most obvious disadvantage of the pillarless sublevel caving method is its large loss and dilution， mainly caused by the ore drawing under the overburden strata. As the object of ore drawing， it is of great significance to fully understand the caved ore sharp to reduce the ore loss and dilution. Therefore， on the basis of analyzing the influencing factors of caved ore sharp， the research status is summarized and discussed from the experiments of caved ore sharp and its influence on ore-drawing effect. The caved ore shape is affected by blasting parameters， ore body， overlying rock properties， loose body， release body， residual body， stope structure parameters and ore-drawing technology etc.. At present， accurate on-site measurement is the difficulty in surveying the caved body shape. Physical simulation and numerical simulation are the main means of surveying. However， seeking for a suitable blasting alternative is the key to improve the similarity between physical simulation and production practice. The geometry， fragmentation， and caving area of the caved ore body all have an impact on the drawing effect. Therefore， the mining process should be regarded as an organic whole， and the relationship mechanism among the release body， loose body， and caved ore body should be further quantitatively studied so as to obtain the best drawing effect.

Key words: Pillarless sublevel caving method, Caved orebody, Physical simulation, Numerical simulation, Ore drawing