中文摘要：

针对露天转地下开采中境界顶柱的合理厚度问题，结合司家营铁矿实际情况、地质资料和采矿资料，应用FLAC^3D软件建立矿体的力学模型，模拟境界矿柱的受力及其塑性区分布情况，研究境界顶柱、间柱厚度以及间柱之间的间隔距离对矿柱应力分布以及塑性区分布的影响，从而确定境界矿柱的合理厚度及其他的相关参数，为该矿山露天转地下生产顺利进行提供科学依据。

英文摘要：

Focusing on the problem of reasonable thickness that the boundary pillars should be reserved during transferring open-pit into underground mining, and basing on the analysis of the detailed geological information, mining information and the reality situation, the mechanical modeling for the sijiaying Iron Mine is established by using flac3d numerical simulation software. The stress distribution and the plasticity zone distribution of the boundary pillar are simulated and analyzed with the model. And how different thickness of the boundary pillars and top pillars and various distance between pillars affect the stress distribution and the plastic zone distribution of the boundary pillars are studied, so the reasonable thickness and the distance of the boundary pillars or other relative parameters are determined, all these provided scientific direction for producing with great efficiency and safety, when it is on time for transferring open-pit into underground smoothly.