CAJ | 학술논문

许多露天矿山的后期会面临由露天开采转地下开采设过渡问题。通过在露天坑底留设境界顶柱可以保障露天开采与地下开采的同时进行。然而，境界顶柱的留设会给地下开采的安全带来隐患：如果境界矿柱留设过薄，易造成境界顶柱突然塌落，反之会造成资源浪费。以马鞍山铁矿3号矿体露天转地下开采的实际工程为研究对象，借助FLAC3D软件进行正交数值模拟试验，依据试验结果通过多元线性回归的方法，建立了能够反映各影响因素综合作用下的境界顶柱最优安全厚度的数值预测模型，获得了不同剖面下境界顶柱的最佳厚度。可为类似工程设计时参考。
허다로천광산적후기회면림유로천개채전지하개채설과도문제。통과재로천갱저류설경계정주가이보장로천개채여지하개채적동시진행。연이，경계정주적류설회급지하개채적안전대래은환：여과경계광주류설과박，역조성경계정주돌연탑락，반지회조성자원낭비。이마안산철광3호광체로천전지하개채적실제공정위연구대상，차조FLAC3D연건진행정교수치모의시험，의거시험결과통과다원선성회귀적방법，건립료능구반영각영향인소종합작용하적경계정주최우안전후도적수치예측모형，획득료불동부면하경계정주적최가후도。가위유사공정설계시삼고。
Many opencast mines will face the transition from open-pit mining to underground in their late stage . The arrangement of boundary crown pillars in the bottom of open pit can guarantee the simultaneous operation of the open-pit and underground mining .However ,boundary crown pillars will bring potential danger to the safety of under-ground mining:if the boundary pillars are too thin ,they are prone to sudden collapse; and if thick,a waste of re-sources.This paper has taken the practical engineering of No.3 Orebody of Maanshan Iron Mine as the research sub-ject.With the help of FLAC3D software to carry out orthogonal numerical simulation experiments ,and on the basis of the experimental results ,numerical prediction model reflecting the optimal safety thickness of boundary crown pillars under the comprehensive influence effect is established by multiple linear regression method .And the optimal thick-ness of different profiles of boundary pillar has been obtained .References can be provided for similar projects .