近几十年来,瑞典铁矿所用的无底柱分段崩落法越来越成为一种在数量上占优势的采矿方法。其原因在于开采深度的增加带来了岩矿强度降低和稳定性变差等困难问题和人们对作业机械化、工艺标准化的要求都是其他方法不易解决和满足的。无底柱分段崩落法的最大缺点,是废石混入多和矿石损失大。分段崩落法始源于美国,是由阶段崩落法演变 In recent decades, the pillarless subsea caving method used by the Swedish iron ore has increasingly become a quantitatively dominant mining method. The reason is that the increase of mining depth brings about such difficult problems as the decrease of strength and stability of rock and mine and the requirement of mechanization and standardization of workmanship that others are not easily solved and satisfied by other methods. The biggest disadvantage of the subsea caving method is the large amount of waste rock mixed and the loss of ore. The caving method originated in the United States and evolved from the caving method