| At the later mining stage, a lot of opencast mines are faced with the transition stage from surface mining to underground mining, which is very complicated. In this period, it is a very important subject of this transition period to optimize the boundary pillars of open mine bottom, for it works on many aspects, like the smooth transition of mine production and safety in production. In the past, similar problems were solved by project analogy in dependence of experiences. This method of analogy plays a very important role in the development of the mining industry and is often used presently. Because of the complexity of mechanical property and mining conditions, some problems can not be sometimes solved by analogy, like mining exploitation. Therefore, it is necessary to use the more suitable method to solve troubles during the process of the exploitation. So, the numerical simulation method is very good for mining optimization.In the paper, a large number of information is referred and then the numerical simulation is adopted to optimize the boundary pillars in the transition from surface mining to underground mining of Daxingshan mine. Firstly, the status of the production is been analyzed of from surface mining to underground mining of the metal mines in our country; secondly, the Daxingshan mine's basic exploiting datum are collected and the exploiting conditions of the mine are grasped; thirdly, it is presented of the used-commonly methods and general steps of mining optimization; after the introduction of the numerical simulation method, the general steps are given of the optimization of the boundary pillar by FEM; the 3-D geological model of Daxingshan mine is set up, and different schemes are carried on by the 3-D finite element software; finally, the numerical results are analyzed, and by comparison, the optimal is offered; moreover, the valuable suggestions are put forward for the production and design of mine.
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