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Table of Content

    15 May 2014, Volume 30 Issue 05
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    Application and Numerical Simulation of Extremely Fractured Ore Deposit Mining
    YANG Qing-Lin, WANG Xing, SUN Guo-Quan, WANG Liang
    2014, 30(05):  1-3+27. 
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    According to the geological conditions of extremely fracture ore deposit of a gold mine,the mining method is preliminary selected by economical and technical comparison and the stoping scheme is determined by numerical simulating of the stope parameters.The application results show that,the stoping scheme of this paper is feasible and it provide some reference for the related ore deposit mining.
    Research on the Deformation of Broken and Inflation of Broken Complete Rocks Based on Graphical Method
    SONG Chao-Bu, SHEN Jiao-Ping, XING Ning-Jiang
    2014, 30(05):  4-5+19. 
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    The graphic method is adopted to explain and analyze volume expansion of broken complete rocks and the structure effects between the rocks.The research results show that,the little rocks of different sizes and shapes of broken complete rocks are acquired.Surface and line contact are the two kinds of contact modes.The bearing structure is stability, instability, stability periodic changes,and the its bearing capacity is more and more small.
    Experimental Research on the Filling Materials of the High Concentrations of Whole Tailings Structure Flow Cementing Filling Technology
    ZHANG Sheng-Xiang, WANG Wei-Jie
    2014, 30(05):  6-8+29. 
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    The filling material experimental research is conducted so as to obtain the reasonable filling pulp conveying parameters and proportion of filling materials. The research results indicated that, graded distribution of the stope backfilling materials is good, grading of the stope backfilling materials is uniform and the backfilling setting velocity is fast. When the concentration of the cement-tailings slurry backfilling materials is 68%~72%, good performance of pipe flow transmission and water retention are obtained, bad phenomenons such as segregation and settlement are eliminated.Hardening of solidification situations of different cement-tailings contrast filling blocks are normal, strength of filling blocks is improved steadily. On the whole,the strength of filling blocks are good, the concentration of the slurry can be improved by adding the cement so as to improved the strength of filling bodies.
    Research on the Reasonable Differential Time of Deep Hole Blasting in Meishan Iron Mine
    CUI Zheng-Rong, ZHANG Xi-Liang
    2014, 30(05):  9-10+39. 
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    In order to reduce the influence of blasting vibration on the surrounding environment, the original blasting technology is improved, that is to say, the 3~5 holes blasting method is instead by the by hole blasting method and the reasonable differential time of the by hole blasting method is researched. The signal hole blasting analysis method is adopted and the mathematical model is established based on the VB6.0 so as to analyze the waveform by increase 1 ms at a time. According to the research results, when the differential time is 23 ms, the minimum blasting vibration velocity is acquired. So it is consistent with the field test results. Therefore,the researches of this paper can provide some theoretical basis for the mine vibration-suppressing blasting works.
    Dynamic Updating and Application of the 3D Digital Mine Information System
    ZHOU Zhi-Hui
    2014, 30(05):  11-15. 
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    The 3D digital mine information system is established in 2008 by Guangxi Gaofeng Mining company. Updating the 3D digital mine information system can provide guidance for prospecting and mining design and the dynamic production management work.Based on the Surpac software, the mine geological database is rebuilt, the 3D terrain model, 105# ore body mining entity model and 3D model of the magmatic rocks and exploration engineering system are built combining the latest mine geological and surveying data. Besides that, application of some relative models are analyzed. The research results of this paper have great significance to provide guidance to the design of mining exploration and dynamic production management and improve the efficiency of the mine construction works.
    Research on Stability and Construction of the Large Intersections of Deep Roadway
    TANG Jie
    2014, 30(05):  16-19. 
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    The depth, strength of surrounding rocks, pressure coefficients,intersections structure, construction methods are selected as the factors that affect the stability of large intersection construction so as to establish the fuzzy mathematical quantitative evaluation model based on entropy. Taking the intersections construction of the track lane yard of the twentieth mining area of Chengjiao coal mine and the large track lane roadway as an example,small blasting construction method,anchor cables with dark anchor cables construction method, anchor beams reinforcement method are adopted to guarantee the intersections construction smoothly. The concepts of thermodynamic entropy and information entropy are introduced to calculate the weight of each factor, so, the weight vectors of the evaluation factors are acquired so as to to conduct fuzzy comprehensive evaluation on the stability of intersections. Compared with the actual situations, the accuracy of the evaluation results are proved and the rationality of the construction method are verified. Therefore, the research results of this paper have important guiding significance to the intersections construction in the future.
    Beneficiation Tests on an Oolitic Hematite from Enshi
    DING Bao-Cheng, YANG Da-Bing, WANG Xiong, XU Jia-Xin
    2014, 30(05):  20-22+42. 
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    Magnetic roasting, low intensity magnetic separation, reverse flotation process was carried out on an oolitic hematite, Enshi. The results showed that with 7% dosage of reducing agent, calcinations at 850 ℃ for 90 min, and the roasted products were grinded at fineness of 85% passing 0.074 mm for magnetic separation at 278.67 kA/m field intensity. Iron concentrate with iron grade of 63.78%, recovery of 58.72%, and 0.25% P can achieved through dealing magnetic concentrate with NaOH dosage of 1 500 g/t, starch dosage of 1 200 g/t, CaO dosage of 900 g/t, RA-715 dosage of 750 g/t, 2# oil dosage of 20 g/t for reverse flotation process.
    Statue and Development of Pretreatment Technology for the Refractory Gold Ore
    LEI Zhan-Chang, YU Jie, MA Hong-Rui
    2014, 30(05):  23-24+33. 
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    Pretreatment technology should conducted on refractory gold ore to increase its leaching rate. Pretreatment technologies for the refractory gold ore were introduced by oxidation calcinations, high pressure oxidation, bacterial oxidation, chemical oxidation, magnetic pulse method.
    Analysis on the Copper-Gold Ore Characteristics and Gold Occurrence
    HUANG Mao-Kun
    2014, 30(05):  70-72+128. 
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    The ore-forming elements of Ⅰ# orebodyof the Yinzishan copper and gold mine in Yunnan province are mainly copper, zinc, gold and silver, while Ⅱ#orebody are mainly formed by gold element. The ore characteristics and gold occurrenceof Yinzishan copper and gold deposit are analyzed so as to have a deeper understanding of mineral association and the genesis of mineral deposit. The research results have the important guiding significance for the development and utilization of the deposit as well asprospecting work for the same type of deposit.
    Analysis on the Failure Characteristics of Infrabasal Plate of Close Coal Seam Mined-out Area Based on UDEC Software
    HAN Chang-Jiang
    2014, 30(05):  93-94+171. 
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    For the close coal seam, the lower coal seam roadway is always influenced by the the upper coal seam, the roof strata of the close coal seam is damaged in different degree, It is so difficult to support the roof strata because its integrity is relatively poor.According to these problems,the discrete element software UDEC is adopted to analyze the failure characteristics of the lower coal seam roofs under the conditions of the difference of two layers coal interlayer thickness. Besides that, the the stability of mining roadway is also analyzed based on UDEC. Therefore, the research results can provide theoretical support for selecting the reasonable supporting pattern and designing the supporting parameters.
    Numerical Simulation Research on the Influence of Restricted Jet Structure Parameters to Ventilation Flow Field
    ZHOU Xin-Ming, TANG Min-Bo
    2014, 30(05):  95-97+194. 
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    The fluid dynamics software is adopted to do simulation research on the ventilation flow field of drivage roadway coal face and analyze the influence of restricted jet structure parameters such as the location and wind velocity of air duct export, distance between air duct export and working face, aspect ratio of drivage roadway cross section to ventilation flow field. The research results show that, the air duct export should be located in the apex angle of drivage roadway so as to increase the effective range of jet. The wind velocity of air duct export has little impact on the central axis wind velocity of drivage roadway under the conditions of the same of the air duct diameter. The distance between air duct export between drivage roadway cross section has little impact on ventilation flow field within the effective range. Besides that, the larger aspect ratio of the drivage roadway cross section, the better adhesion effect on the jet.
    Research and Analysis on the Pre-grouting Slurry of Metal Deposit Sink Wells
    JIAO Yong-Fu, CHEN Chao, CHANG Long-Xin
    2014, 30(05):  98-100. 
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    Well built engineering|Surface pre-grouting|Water control|Clay slurryThe water contents of quaternary system of the southern part of Sijiaying iron mine is rich. The freezing method is taken as the construction method in sink wells. The surface pre-grouting method is used to deal with the water in the bedrock fissure in sink wells and the ratio and function of clay cement grout and the influence of each other are analyzed, so, the suitable ratio of grout is acquired. On the whole, the bedrock fissure water inrush is well controlled.
    Application of the Transient Electromagnetic Technique in Controlling the Water Disaster in Excavation Roadway
    XU Wen-Xing, WANG Yu-He, WANG Sheng-Long, XU Bin, CHENG Guang-Tan
    2014, 30(05):  101-103. 
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    The basic principle and methos of the mine transient electromagnetic detection technique are briefly introduced.Combing the advance detection of a mine as an example,the working method,data processing method,interpretation and application effects of transient electromagnetic technique are analyzed in detail. The engineering application results show that,the transient electromagnetic technique can detect the water inrush structure of the excavating roadway frontal effectively so as to provide the reference to drivage roadway and prevention and control of serious water damage accidents.
    Construction and Application of the Slope Monitoring Visualization Analysis System
    YANG Zhi-Yong, LIU Jian-Yu
    2014, 30(05):  104-108. 
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    With the development of science and technology, GPS(Global position system) has been widely applied to in open-pit mine measurement acceptance,slope monitoring. The slop GPS dynamic monitoring and warming system based on GPS and wireless communication technology and visualization technology play a crucial role in open-pit mine production safety. Based on the slop GPS dynamic monitoring and warming system, the slop monitoring visualization analysis system is developed combining the mathematical statistics and 3D visualization technology. The research results proved that, the slop monitoring visualization analysis system improve the effect of GPS monitoring data of open-pit mine slope, enrich the monitoring methos and have the great popularization significance.
    Analysis on Stability of the Dry Stockpiling Tailings Dam
    YANG Chao-Qun, SHI Peng, QIN Ke
    2014, 30(05):  109-111. 
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    In terms of engineering design work, the dry stockpiling tailings dam stability is analyzed only by considering the running state of the slopes, without considering the rainfall factors. The pore pressure and stress are not analyzed by adopting the coupling theory under the condition of rainfall. The soil constitutive equation, seepage equation, soil mass balance equation and unsaturated soil pore pressure and stress coupling theory are adopted to analyze the influence of coupling of pore pressure and stress to the stability of the dry stockpiling tailings dam. The research results show that, the smaller stability coefficients are acquired by not considering the pore pressure and stress coupling, besides that, the coefficients are good to guarantee the safety of tailing dam.
    Research on Active Excitation Mechanism of Germanium Slag as Cement Admixture
    LI Hui, WANG Yi-Ming, JIAO Hua-Zhe, LIU Xiao-Hui, YU Shao-Feng
    2014, 30(05):  142-146. 
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    Germanium slag, as the solid wastes in the process of mineral resources exploration and utilization, but the storage of slag for long-term not only causes the waste of resources, but also seriously affects the surrounding environment. The physico-chemical properties of germanium slag was researched, and the germanium can be used as cement admixture. Na2CO3, AlCl3·6H2O, Ca(OH)2 as well as NaAlO2 could be used as activator to enhance the comprehensive strength of samples, NaAlO2 has the most activition, NaAlO2 and hydration products Ca(OH)2 reaction and generated octahedral [Al(OH)6]2-, which reaction with gypsum under alkaline environment and ettringite was generated and would enhance the sample strength.
    Application and Research of Short-wall Mechanized Coal Mining with Continuous Miner in Slowly Inclined Thick Coal Seam
    JIANG Xiao-Jun, SHI Liang
    2014, 30(05):  147-149. 
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    According to the analysis results of geological conditions coal seam and its law of mine pressure,the roadway layout scheme and equipment matching way of 415 working face are researched.The research results show that,the continuous miner short-wall complete sets of equipment has good adaptability to slowly inclined thick coal seam.The characteristics of mine pressure of short wall working face is similar to long wall working face and the first weighting and periodic weighting are existed.Therefor,the research results of this paper lay a foundation to expand the application range of the continuous miner and provide guidance for the short-wall mining method of the similar coal seams.
    Research on a Double-channel Drill Rods for Horizontal Directional Drilling
    TANG Da-Yong, SUN Dai, ZHANG Ning, ZHANG Yu, SUN Sheng
    2014, 30(05):  150-152. 
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    The double-channel drill rods of horizontal directional drilling system are taken as the research objects. According to the working principal of directional drilling, the structure and designing process of the double-channel drill rods are analyzed in detail. Besides that, intensity and sealing structure of the double-channel drill are calculated. The reliability of signal transmission of the double-channel drill rods is versified by some related technological experiments.