Research On The Key Techniques Of Stable Transition From Open Pit To Underground Mining In Beizhan Iron Mine

By analying and researching the the present situation of surface mining and the mining technical conditions in BeiZhan Iron Mine,constructing the analysis platform of the key technique for the transition of the mine、adopting the reasonable mathematical optimization methods and using the numerical simulation analysis of the stability of open pit slope for the transition are proposed in this article,thus the mining method and the mining scheme of the transition will be optimized with these researches,furthermore the technical measures of the stable transition from openpit into underground mining will be obtained.1)Through the field investigation and preparation of the basic geological data provided by BeiZhan Iron Mine,this article systematically studies the geological conditions of the mine、the occurrence conditions of the ore deposits、the engineering2)Based on the modeling software,a technical analysis platform of the transitional stage for the transitional preparation from open-pit to underground mining was constructed,and the amount of available resources during the transitional period in openpit environment was analyzed.The upper part of the open-pit realm,the underground main engineering area and hanging wall ores mining area were divided into different parts to determine the optimal time and space nodes for the transition period.3)Based on the present mining status and geological data of the mine,this article analyzes the influencing factors which affects the selection of mining methods for the transition from open pit mine to underground mine with a economic,safe and efficient objective,4)Using the FLAC(a 3D modeling software)to establish the analysis and simulation platform for the open-pit slope and the hanging-wall mining in the transitional period.By simulating mining the hanging-wall ores which can influence the safety and stability of the upper open slope during the transitional period,it could be concluded that Figure 18;Table 8;Reference 56.