自然崩落法底部结构应力状态研究

以普朗铜矿为研究背景，通过分析拉底工程在自然崩落法中的重要性，应用FLAC3D数值模拟软件，研究拉底过程中，逐渐增大拉底推进线尺寸时，底部结构应力状态的分布情况，得到一个聚矿槽开挖距拉底推进线较有利的距离。并且，在实测地应力的基础上，通过改变水平构造应力值，研究了4种不同应力状态下，底部结构的应力分布情况，分别得出有利于矿石崩落及底部结构稳定的应力状态。该研究成果将对自然崩落法矿山的采矿工艺设计和安全生产具有指导作用。

Research on Bottom Structural Stress State by Natural Caving Method

With the Pulang copper mine as background，the importance of the undercutting project in natural caving was analyzed.With the use of FLAC3D numerical simulation software，the distribution of the bottom structural stress state is studied during the process of undercutting，with the size of the undercutting line gradually increasing.A more favorable distance from the undercutting line to the poly trough was obtained.On the basis of the measured ground stress，and through changing the horizontal structural stress values，the stress distribution of the bottom structure were described under four different stresses.The stress state which is beneficial to the ore caving and the stability of the bottom structure was determined.The research result can provide a guide for designing mining process in mine with caving method and safety production.