| The ore-bearing rocks demolition quality of the strip mine exploded means a lot to the subsequent mine development and the enhancement of the production benefit, how to quantitatively evaluate the demolition quality for the past many years has already to become the important topic to the domestic and foreign mining scholar. So far, the distribution is an important target which is widely used in the explosion engineering to quantitatively evaluate the demolition quality, it also affects the mine demolition production subsequent procedures such as shovel attire, the transportation and the machinery stave efficiency and the mining production total cost. Therefore, further research on the demolished fragment has significant practical meaning to the mine.In fact, rock mass that cut by weak part such as jointing and crevasse and so on, has key influences on demolished fragment, therefore, to seek one suitable method for the description of jointing and the crevasse distribution to solve the rock mass demolished fragment is necessary, just in order bring the rock mass jointing and crevasse distribution into the demolition physical process, and analyze the formation regulation of the demolition rock mass clod and the demolition mechanism with jointing.The present paper is carried out in associated with " Research In vain Phosphorus ore Open-air Stair Deep Hole Explosive technique Yunnan Bright Chemical industry Limited company ". First, the present demolished situation of the BaiDeng phosphorus ore stair, the existence question, formation reason of the bulk and the foundation are analyzed, according to the analysis outcome, the scene investigation and study is carried out, basing on this, further analysis has been carried out according to the ore-bearing rock geology situation and drilling, demolition and the shovel.36 production demolition test has been carried out, the application of stereoscopic theorem is applied to carry on the determination of demolished fragment computation. According to the fractal theory, the BaiDeng phosphorus ore's first 10 groups experiment demolition parameter are analyzed, through the jointing investigation before explosion, the samples from explosion piles, the determination of the demolished fragment composition and the demolished fragment distribution regression analysis, the basis for reasonable demolition parameter is provided, the shot hole net parameter of BaiDeng phosphorus ore is provieded. Considering the rock mass demolition as gray system, the grey connection analysis method is used for the determination of the jointing frequency, pitch of holes, single explosion consumption and the resist line are main factors to the demolition quality, the influence function order of various factors has been determined, finally the optimum demolition plan of BaiDeng phosphorus ore is suggested. The net hole parameter, the powder charge structure and the demolition method after optimization is used in the mine practical application, which has made the single explosion consumption drop in range of 8.6%-26.5%, moreover, the blasting effect is improved, the bulk rate reduced from 5%-9% to 2%, the shovel efficiency is also improved, the foundation phenomenon after demolition is well solved, demolition efficiency is raised.In the field experiment for the last twelve months, by the chosen of demolished parameter, the production cost of the ore is reduced, better social and economic benefits are obtained. |
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