关键词: 无底柱分段崩落法, 铲入深度, 放出体形态, 相似模拟试验

Abstract: The loss and dilution in the ore drawing process of non-pillar sublevel caving method is influenced by the mutual restrictive relations among caved orebody，drawn-out body and caving pace.Based on the large structure parameter with a single drawing drift，physical simulation test with five different shovel depths under 3.6 m caving pace are carried out.The position of the sliding surface is obtained by the position information of the drawn-out marker particles，effects of the shoveling depth on the development form of the drawn-out body is studied，and the relationship between shovel depth and drawn-out body and the matching relationship between draw body and caving pace are analyzed.The results show that:①the maximum outline of drawn-out body along the drifting direction is larger than that of the caving body under the caving pace of 3.6 m and 5 different shoveling depths；②the shoveling depth has a certain influence on the development of the shape of drawn-out body，the height of drawn-out body increases first and then decreases with the increase of the shoveling depth，the width of drawn-out body along the drifting direction is increased，based on the analysis of pure ore recovery amount and ore recovery rate，the ideal shoveling depth is 5.32 m，and the corresponding recovery rate is 57.74%.

Key words: Non-pillar sublevel caving method, Shoveling depth, Shape of drawn-out body, Similar simulation test