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Table of Content

    15 July 2012, Volume 28 Issue 07
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    Optimization of Structural Parameters of Large-diameter Deep-hole Stage Open Stoping Method
    XIE You-Sheng, LI Xue-Feng-
    2012, 28(07):  7-9. 
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    During the process of implement of large-diameter deep-hole stage open stoping method of a mine, according to the occurrence condition of ore body, feasibility of mining economic, production management and other situation, vertical ore body to the layout of the mine block and along the ore body to layout of the mine block were adopted.On the basis of rock mechanical properties study, numerical simulation was done on stope structural parameters of large-diameter deep-hole stage open stoping method of this mine by FLAC3D, and the parameters of ore block, ore room, pillar were determined.
    Breaking Arch Evolution Law of Short Distance Coal Seams Uplink Mining and Numerical Simulation
    HUANG Shou-Qing, LU Guo-Zhi, ZHANG Lin-Liang, WU Quan-Lin
    2012, 28(07):  10-12. 
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    Simulation analysis were done on breaking arch developing and evolving process of both single stope and compound mining field by FLAC3D, evolution law and change shape of breaking arch at stope upper part of short distance coal seams uplink stope structure space under single stope and compound mining field two different situations were obtained.
    Classification and Application of Tunnel Surrounding Rock based on Unascertained Average Clustering Method
    XIAO Tian-Zuo, DAI Bing, ZHAO Jing-Qing
    2012, 28(07):  13-15+24. 
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    Unascertained measurement theory was applied in tunnel surrounding rock classification, unascertained average clustering method was raised and unascertained average clustering model of tunnel surrounding rock classification was set up.Unit weight, tensile strength, sound degree coefficient of rock was selected as the evaluating parameters of classification model.Using 14 kinds of measured data of rock to build the unascertained measurement function of classification of judging indexes, average value of each classification sample index and single index measure matrix were obtained; weight of each index confirmed according to the information entropy theory, determine classification of rock was done by using credible degree recognition criterion.Classification forecasting was done on tunnel surrounding rock of mining area by using this model.Prediction results are closely with measured results after comparison, and it offers a new way for tunnel surrounding rock classification.
    Research and Development of Prediction and Forewarning System of Goaf Safe Roof Thickness
    LI Chao-Liang
    2012, 28(07):  16-20. 
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    A new kind of calculation formula of goaf roof critical thickness was proposed based on thin plate theory.Used it as the core, a set of prediction and forewarning system of goaf safe roof thickness was developed combined with site actual requirement and adopted object-oriented thought and using Flex technology.Collection and input of goaf information are realized in this system, arrangement and maintenance of goaf information are completed, which could display goaf detailed information visually, and it can emphatically analyze the danger degree of goaf and alarmed in time.This system gets good effects in prediction and forewarning of a mine goaf.
    Research on Treatment Plan of Ⅱ# Ore Goaf of Dazhong Iron Ore
    WU Jin-Tao
    2012, 28(07):  21-24. 
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    For the goaf hazards existed after Dazhong iron ore Ⅱ# ore exploitation, goaf treatment plan of caving control combined with induced caving was proposed.Shock model was set up according to goaf caving blast shock principles and caving blast shock hazards were evaluated.Suggests were proposed for cushion thickness, delineation of surface caved area and setting of warning marker of goaf, solved the hazard of Dazhong iron ore goaf effectively.
    Experiment of Complicated Copper Lead Zinc Ore
    LING Xian-Ming, WU Bao-Qi, XU Jia-Ping, YE Zhen-Hua
    2012, 28(07):  25-28+46. 
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    Aiming at the characteristics of a complicated copper lead zinc ore in Anqing of Anhui province and problems existed in trial production of this mine, through systemic experimental study, separation process and reagent system were confirmed, valuable elements of copper, lead, zinc, silver of ore were recoveried synthetically, provided technical reformation scheme for full use of mineral resources, enhanced economic benefits of enterprise further.
    Simulation Research on Detection and Inhibition of Harmonic Wave of Mine Hoist
    LI Wei
    2012, 28(07):  29-31. 
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    Token the harmonic wave generated by power supply system of mine dc winder as the research target, harmonic wave treatment and reactive power compensation were done on power network by adopted dynamic detection and inhibition methods of harmonic.The harmonic characteristics were simulated by MATLAB and dynamic detection and inhibition simulation of harmonic were done.The results indicate that this method could test the harmonic in power supply system of hoist timely, and could inhibit harmonic effectively.Through the treatment by active filter, general aberration rate of harmonic of hoist system reduced to around 1% and power factor closed to 1.
    Numerical Simulation on Seepage Calculation of a Tailings Reservoir
    GUO Jian-Wen, FU Cun-Lu, LI Wen-Jie, KANG Zhi-Qiang
    2012, 28(07):  32-34. 
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    According to the specific engineering geological condition of tailings reservoir, simulation calculation of seepage numerical were done on tailings reservoir by seepage analysis software.Considering seepage water of tailings reservoir does flow movement of low Reynolds number during flowing in tailings deposit body, seepage numerical calculation of different dam heights under normal and flood running condition were simulated based on linear Darcy law.The results show that velocity vector is much big at gulch position, quicksand carrying could intensify local hazards; total head was biggest around waterside and the possibility of saturation line overflowed at top of dam was biggest during the infiltrating process of reservoir water level to downstream tailings accumulative dam, and seepage destruction was mostly liable to happen.
    Research Situation of Drainage Technology of Tailings Dam
    JIN Song-Li, XU Hong-Da, ZHANG Wei, YAN Hao
    2012, 28(07):  35-38. 
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    The importance of drainage of tailings dam was summarized.Principle and advantages and disadvantages of normal drainage of tailings dam method were introduced, the effect of drainage system was analyzed through engineering example, finally the research situation of drainage technology was summarized, the development trend of this technology was prospected.