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A comparative study on the mix proportion regulations of shotcrete at home and abroad COAL ENGINEERING    2016, 48 (11): 27-30.   DOI: 10.11799/ce201611009 Abstract （795）      PDF （1285KB）（956）       Knowledge map    We have used a China, American and European regulations of concrete mix proportion design method, and we also have designed the mix proportion of shotcrete which strength grade is C30 and slump is 110 mm. Through the qualitative and quantitative analysis of three kinds of design steps and calculation methods, we have got the following conclusions: The effect of the amount of materials on the mix proportion is arranged in the order of the large to small is aggregate proportion, water cement ratio, water consumption or cement content; Determination of proportion of aggregate in China based on experience, the method of ACI is to determine the amount of coarse aggregate and then further determine the amount of fine aggregate, while Europe is get scientific and precise values by complex computation based on the FAURY method. By comparing three different methods we can see, choosing the same parameters, but the calculation of the mix proportion is different. Therefore, in actual engineering, we can combine two or three methods, so that we can better guide the shotcrete mix proportion design and construction work. Reference | Related Articles | Metrics

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Operation System Simulation and Optimization of Open-pit Mine Based on GPSS/H COAL ENGINEERING    2015, 47 (2): 123-125.   DOI: 10.11799/ce201502040 Abstract （701）      PDF （654KB）（850）       Knowledge map    Reference | Related Articles | Metrics

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Blasting Ming Face of The Goaf "Three Zones" Distribution of Numerical Simulation Research shi lei COAL ENGINEERING    2013, 45 (11): 53-56.   DOI: 10.11799/ce201311019 Abstract （757）      PDF （760KB）（2382）       Knowledge map    Accurate division of spontaneous combustion in goaf of "three zones", to guide the on-site fire-fighting has important significance. According to the actual situation at the scene observed partial known parameters (flow, pressure and goaf size etc.), FLUENT software was used to simulate the blasting mining working face goaf of oxygen concentration field, the simulation results and field measured data (oxygen concentration) were compared and analyzed, and the simulation parameters are adjusted suitably, until the simulation results with the field measured data can be retrieved, correct simulation parameters (porosity, permeability and viscosity resistance etc.), eventually to simulate oxygen concentration field, velocity field, the distribution of the gas concentration and pressure distribution, through the double indicator method (upper air wind velocity 0.004m/s and lower oxygen concentration 8%) division of Gob Spontaneous Combustion "three belt", on the analysis of simulation results can be obtained by goaf spontaneous combustion with a maximum width of 58m, and the calculation of work safety advanced speed of 2.3m/d, for the prevention of spontaneous combustion of coal in goaf provides scientific basis. Reference | Related Articles | Metrics

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Comprehensive governing of large area of the fire in overlying goaf of Bulianta coal mine COAL ENGINEERING    2014, 46 (2): 52-54.   DOI: 10.11799/ce201402018 Abstract （771）      PDF （805KB）（966）       Knowledge map    When stope caving in working face 22305 of coal seam 2-2, the floating coal in goaf 12306 of overlying 1-2 coal seam got spontaneous combustion, resulting in overrunning of the concentration of CO gas at face 22305 in Bulianta coal mine. With the analysis of the fire area situation, a variety of methods were used for fire regional governing. However, the effects of former ways are not obvious because of the large area of fire, the serious leakage of goaf air and the fast growth of the fire zone et.al. According to the characteristics of the situation, the working face 22305 was closed later and comprehensive measures of filling liquid nitrogen and liquid carbon dioxide from the ground into under goaf were taken. It achieved good results and the high-temperature region of the face 22305 in overlying goaf were effectively controlled, which make the face safe mining after unsealing face 22305. Reference | Related Articles | Metrics

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A Preliminary Analysis of Selection and Application of the Hydraulic Coupler in the coal preparation plant Wan Liping COAL ENGINEERING    2015, 47 (8): 33-34.   DOI: 10.11799/ce201508012 Abstract （757）      PDF （710KB）（802）       Knowledge map    By analyzing the work principle of the Hydraulic Coupler,and the advantages and disadvantages of Torque-limited Hydraulic Coupler,Velocity Modulated Hydraulic Coupler in controlling belt conveyor,comparing the cost-effective of Torque-limited Hydraulic Coupler with Velocity Modulated Hydraulic Coupler. Selecting of soft-start equipment in the coal preparation plant is depending on the character of belt conveyor is proposed.At last,the suggestions that Hydraulic Coupler is prior option when reducing the investment in the coal preparation. Reference | Related Articles | Metrics

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COAL ENGINEERING    2012, 44 (5): 27-30.   Abstract （539）      PDF （883KB）（1449）       Knowledge map    Related Articles | Metrics

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The microscopic pores structure and adsorption characteristics of different lithotypes in Hancheng coal mining area COAL ENGINEERING    2016, 48 (11): 107-110.   DOI: 10.11799/ce201611031 Abstract （497）      PDF （1333KB）（689）       Knowledge map    Abstract: In order to further study the microscopic pores structure and adsorption characteristics of coal reservoir, the coal samples in Hancheng mining area of Carboniferous Jurassic and Permian system are selected to conduct the low-temperature adsorption of carbon dioxide and nitrogen adsorption/desorption experiments and the microscopic pores structure of different lithotypes were discussed. On this basis, the methane isothermal adsorption technology was carried out and which would be compare the adsorption characteristics of different lithotypes. The experimental results show that because of the different lithotypes, the D-R specific surface area and the total pore volume of D-A aredifferent. From the dull coal to the bright coal, the content of micropores increases with the increase of the content of the vitrinite and the D-R specific surface area and total pore volume of D-A also show an increasing trend, but the BET specific surface area and the total pore volume of BJH trend show the opposite. Therefore, compared with the bright coal which have the high content of micropores, the dull coal that with the low content of micropores have the poor adsorption capacities, and followed by the semibright coal and the semidull coal. In terms of the pore structure of the different lithotypes , the bright coal and semibright coal are generally the type I which one end are closed, the semidull coal is mainly based on the open typeⅡ, while the dull coal is the typeⅢof "ink bottle pores" Related Articles | Metrics

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COAL ENGINEERING    2011, 43 (3): 102-104.   Abstract （710）      PDF （880KB）（1174）       Knowledge map    The paper base on the processing technology of the common bolt in understructure engineering, irrational bolt structure and low limit of bearing capacity were put forward by the investigation and analysis of the problem in operational common metal bolt. The paper researched on how to improve the combination performance of the operational metal bolt. Research on the new type big-end bolt, the paper introduced to the processing technology of big-end bolt, analysis the performance of the big-end bolt by tension examination and microscopic examination, the examination indicated that the strength and plastic of the bolt were improved, the crystal grain of bolt was refined by special processing technology, that was of great benefit to the active state of the bolt end. Related Articles | Metrics

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COAL ENGINEERING    2013, 45 (1): 43-45.   Abstract （487）      PDF （506KB）（1335）       Knowledge map    Reference | Related Articles | Metrics

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To Study on Forecasting of Mine Gas Emission Based on The Monet Carlo method COAL ENGINEERING    2015, 47 (3): 83-85.   DOI: 10.11799/ce201503028 Abstract （614）      PDF （873KB）（742）       Knowledge map    The mine working face gas emission is a basic work to prevent the gas gauge. In the paper, the study is based on the mine gas monitoring data and puts forward a new prediction of mine gas emission by used Monte Carlo model. The randomness and the statistical rule of data will be find by the model. This model is used to predict the following production gas emission. The results showed that this prediction method has less restrictions high precision and this prediction method can be a good guide for the production of mine Gas control work. Reference | Related Articles | Metrics

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Optimization of Shaped Charge Blasting for Hard Rock Roadway with Large Section COAL ENGINEERING    2014, 46 (1): 47-49.   DOI: 10.11799/ce201401015 Abstract （644）      PDF （420KB）（861）       Knowledge map    When advancing in hard rock roadway, compared with conventional blasting, the shaped charge blasting technique could get more ideal blasting effect on the premise of saving blasting material. In this paper, according to the geological and construction conditions of rock roadway with large section in Fourth Mine of Pingdingshan Coal Co.,LTD, and based on the principle of shaped charge blasting technique, we designed new blasting parameters on the original conventional blasting parameters. The shaped charge blasting engineering practice showed that, compared with original parameters, the new parameters could increase the footage by 15% and reduce the amount of overbreak and underbreak on roadway surrounding rock by 50% and save the cost by 20%, and achieve good technology economic results. Reference | Related Articles | Metrics

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Caving prevention technology of spontaneous combustion COAL ENGINEERING    2013, 45 (s1): 75-77.   DOI: 10.11799/ce201308079 Abstract （502）      PDF （750KB）（1135）       Knowledge map    “Prevention” is mine as guidelines struggle with various natural disasters, but also to prevent must follow the principle of coal spontaneous combustion.According to the characteristics of the main mining coal seam in Yanzhou mining area, analyzed the characteristics and rules of Yanzhou mining area total working face natural ignition, comprehensive fire prevention and extinguishing technology system suitable for the establishment of Yanzhou fully mechanized top coal caving mining face, has a strong reference for prevention of spontaneous combustion in fully mechanized caving faces. Related Articles | Metrics

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COAL ENGINEERING    2013, 45 (10): 57-59.   DOI: 10.11799/ce201310020 Abstract （644）      PDF （447KB）（1007）       Knowledge map    Related Articles | Metrics

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The characteristic of coal accumulation and sedimentary environment of Coal-bearing Strata in Pingdingshan coal district null COAL ENGINEERING    2010, 42 (6): 0-0.   Abstract （906）      PDF （483KB）（951）       Knowledge map    By the means of the principle and method of the sedimentology and coal geology, and based on the detailed coring data analysis, this paper focused on the sedimentary environment and its evolution, combine the tectonic background in Pingdingshan area. The regularities of coal accumulation in Pingdingshan coal district had been researched. The study shows that the coal-bearing strata in Pingdingshan coal district be formed in littoral depositional system and delta depositional system. Related Articles | Metrics

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Fractal Evolution of Particle Fragmentation of Ore and Rock under Different Impact Energy Coal Engineering    2020, 52 (4): 143-148.   DOI: 10.11799/ce202004027 Abstract （695）         PDF（mobile） （2659KB）（578）    Knowledge map    In order to study the influence of different impact energy per mass on the size distribution of ore and rock, a theoretical model of fractal dimension of particle size and impact energy per mass was established based on fractal theory. The crushing tests of anthracite and gangue under different impact energy per mass were carried out with the drop weight impact tester. The results show that the impact energy per mass has little influence on the particle size distribution of anthracite and gangue, and the G-S distribution can well characterize the cumulative distribution of anthracite and gangue under different impact energy per mass. The fractal dimension of particle size increases logarithmically with the increase of impact energy per mass. The experimental results and published data verify the correctness of the theoretical model. Reference | Related Articles | Metrics

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Study on surrounding rock control optimization with long-holes water injection in large-angle loose and thick coal seams COAL ENGINEERING    2012, 44 (6): 35-37.   Abstract （579）      PDF （568KB）（916）       Knowledge map    Reference | Related Articles | Metrics

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"Two hard" rock island face of strata behavior regularity COAL ENGINEERING    2014, 46 (10): 169-172.   DOI: 10.11799/ce201410048 Abstract （677）      PDF （740KB）（745）       Knowledge map    n order to study Si he Mine 2nd Temple wells IX4302 island face “two hard” rock (hard roof and hard bottom) under geological conditions Strata Behaviors for the safe and efficient mining face similar reference. Firstly, similar to the simulation results overlying strata movement and Strata Behaviors and guides used in engineering practice, and through on-site mine pressure line monitoring and roadway deformation observed, studied law and periodic pressure face abutment pressure range, both complement each other confirmed. The results show that, due to the small mining height face, by the "two hard" rock island in the form of greater impact, periodic weighting obvious, but not strong, basic roof first weighting step distance of 45.7m, periodic weighting from an average of 16.4m; abutment pressure in front of 11m at the coal wall, roadway deformation. Reference | Related Articles | Metrics

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Design and Research of Mine Electrical Equipment Monitoring System Based on Hadoop COAL ENGINEERING    2015, 47 (7): 110-113.   DOI: 10.11799/ce201507036 Abstract （594）      PDF （1340KB）（1048）       Knowledge map    This paper studies the mine electric power equipment monitoring system based on Hadoop, proposes electricity parameter calculation method and the algorithm of time series prediction based on ARMA model, designs and realizes a kind of specially designed integrated protection system for coal mine involves relay protection, measurement and control, data communication, analysis and prediction of historical data. The experimental results show that the system is an effective and practical, strong expansibility and easy deployment of mine power equipment monitoring system. Reference | Related Articles | Metrics

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null COAL ENGINEERING    2010, 42 (4): 0-0.   Abstract （837）      PDF （515KB）（1090）       Knowledge map    Related Articles | Metrics

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COAL ENGINEERING    2013, 45 (11): 1-3.   DOI: 10.11799/ce201311001 Abstract （726）      PDF （505KB）（819）       Knowledge map    Related Articles | Metrics

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Design of Main Drainage Device Condition Monitoring and Fault Diagnosis COAL ENGINEERING    2013, 45 (12): 128-130.   DOI: doi：10.11799/ce201312044 Abstract （247）      PDF （433KB）（1226）       Knowledge map    In view of present situation that main drainage system of many coal mine still run by artificial control and by relying on the experience of miners to judge the fault status，a mine main drainage system based on LabVIEW which can conduct condition monitoring and fault diagnosis was designed. This system can realize the on-line monitoring of data of the mine drainage device’s running state such as the flow of drainage pipe，the water level of the sump，the vacuum degree of the pump，the pressure at the exit of the pump，the temperature of the motor，and vibration of motor，and can realize the on-line evaluation of the running state of the mine drainage device through programming signal processing and analysis，fault diagnosis program. Trial operation shows that this system can run stably，the real-time and accurate parameters can be collected and the system condition evaluating is reliable. Related Articles | Metrics

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Characteristics of Slurry Prepared by Coal and Sludge from Coal to Oil Process COAL ENGINEERING    2018, 50 (5): 131-134.   DOI: 10.11799/ce201805036 Abstract （812）      PDF （1442KB）（739）       Knowledge map    The sludge produced during the coal-to-oil process was mixed with lean coal to prepare the coal/sludge water slurries. The effects of sludge addition on the viscosity, rheological properties and stability of the slurry were investigated. Results showed that with the increase of sludge content, the viscosity of slurries decreased and the maximum slurry concentration decreased. When the sludge to coal ratio increased from 0% to 15%, the maximum slurry concentration decreased from 73.08% to 65.38%. The addition of sludge causes the coal slurry to change from expanding plastic fluid to yielding pseudoplastic fluid, and with the increase of sludge addition, the pseudo plasticity enhanced. In addition, the addition of sludge can significantly improve the stability of coal water slurry. Reference | Related Articles | Metrics

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Soft Rock Roadway Deformation Analysis and Control In Water-Rich Conditions COAL ENGINEERING    2014, 46 (1): 53-55.   DOI: 10.11799/ce201401017 Abstract （652）      PDF （511KB）（813）       Knowledge map    The main factors what lead to instability of soft rock tunnel is Groundwater,it weaked the surrouding of roadway quickly and impacted on deformation mechanism of roadway seriously. By analysis of the geological condition and the surrounding environment.the deformation of soft rock roadway cause the change of surrounding rock stress and plastic zone instability,under the coupling of stress field and seepage field.Groundwater induce wall rock mechanics features become bad gradually because of infiltration and force extrusion.The practice shows that strengthen support and draining water can weaken roadway deformation from the roots. Reference | Related Articles | Metrics

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Study of Bottom Grouting Reinforcement Technique in Working Face with High Water Pressure COAL ENGINEERING    2013, 45 (5): 32-35.   Abstract （614）      PDF （992KB）（861）       Knowledge map    Jiaozuo mining area is the famous mining area with abundant water in China and many water-inrush accidents occurred in history. The bottom grouting reinforcement technique has become one of main methods to prevent water from bottom. Zhaogu No.2 coal mine is the new coal mine of Jiaozuo mining area and it has many features, such as strong rich water, high water pressure and thin impermeable layer, which affect safe production. In order to ensure safe production of working face, based on analysis of the testing working face general situation, the bottom grouting reinforcement technique and its technical requirements were put forward. The grouting method with superhigh pressure, including dispersed pulp, slurry with thin pipeline, double reinforced pipe to prevent blowout and repeated grouting, was designed. The DC detection method shows that the grouting reinforcement technique has significant results and to desired results. At the same time, the working face has been mined 300 meters safely and there is no water-inrush. This also explains that the grouting reinforcement technique plays an important role. The results have certain value and significance to the grouting technology. Related Articles | Metrics

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COAL ENGINEERING    2011, 43 (10): 4-7.   Abstract （783）      PDF （1484KB）（1003）       Knowledge map    Related Articles | Metrics

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The Barapukuria mine original ground temperature measurement and its analysis COAL ENGINEERING    2013, 45 (2): 97-99.   Abstract （600）      PDF （463KB）（846）       Knowledge map    In order to accurately know geothermal disasters situations of Barapukuria Mine, according to the hot circle theory, using the three line method measured the Barapukuria Mine steady-state temperature . Puting forward the method by using linear fitting calculate geothermal gradient, and get Barapukuria Mine -260 m to 430 m-the geothermal gradient is 4.167 ℃/ 100 m, and analyzed the reasons of abnormal temperature in details . The results show that the main factors affect the abnormal geothermal of Barapukuria Mine are the thermal conductivity of rock, geological structure, aquifer and float coal choking oxidation in the goaf. Reference | Related Articles | Metrics

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Analysis on main control factors for production of CBM wells on a smaller scale: a case study on Zhengcun well, Fanzhuang block COAL ENGINEERING    2018, 50 (5): 82-86.   DOI: 10.11799/ce201805023 Abstract （609）      PDF （1953KB）（462）       Knowledge map    In order to explore the main geologic controlling parameters on CBM wells productivity in small scale, deeply analysis on geologic and drainage data of 26 CBM wells are carried out, employing geological analysis and gray correlation analysis. The results show that deliverability of CBM wells has a good relationship with burial depth, coal thickness, gas content, permeability and dredging index, which are main controlling factors, then the order of importance of five geology factors is obtained by using gray correlation analysis, the correlation degree in decreasing order: dredging index, gas content, permeability, coal thickness, burial depth. Dredging index can better reflect potential capacity of CBM wells for characterizes gas-water flow capacity synthetically. Meanwhile, the deliverability of CBM wells is controlled by the coupling of various geological factors, and there is no obvious gap on productivity influences of any single geological factor. Reference | Related Articles | Metrics

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The Technical Application of Pressure Balancing Mining on the Lower Workface of Short Range Seams COAL ENGINEERING    2012, 44 (9): 74-76.   Abstract （468）      PDF （424KB）（912）       Knowledge map    Abstract: This paper mainly described the arrangement form, the establishing progress and the technical characteristics of the workface booster system, pressure balancing monitoring system, the response system for pressure balancing emergency and the monitoring system for pressure balancing safety to prevent the discharge of poisonous gas during the mining on the lower workface of short range seams. Therefore, the study of the technical application of pressure balancing mining on the lower workface of short range seams is of significant importance in terms of coal mine safety and productivity. Related Articles | Metrics

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BP Parameter Optimization Algorithm in Weibull Distribution of Reliability Life Prediction Analysis for Scraper Conveyor COAL ENGINEERING    2017, 49 (1): 106-109.   DOI: 10.11799/ce201701031 Abstract （680）      PDF （1257KB）（527）       Knowledge map    Abstract: Scraper conveyor is one of main electrical and mechanical equipment in the mining face, and its reliability has an important significance to production safety. In scraper conveyor reliability life analysis, the linear parameter method is often used to estimate life in traditional Weibull distribution model. But the error of prediction results is larger due to the nonlinear characteristics of fault data. In this paper, a nonlinear BP parameter algorithm is proposed to optimize the model parameters for the scraper conveyor reliability life prediction. Research results show that the BP parameter optimization algorithm has small life prediction error, and raises the accuracy of the scraper conveyor reliability life prediction. Related Articles | Metrics

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Technology of Fully Mechanized Coal Mining Face Through Fault and Expose the Tail Roadway COAL ENGINEERING    2013, 45 (9): 50-52.   DOI: 10.11799/ce201309019 Abstract （557）      PDF （640KB）（893）       Knowledge map    In order to ensure the safe of mining working face through fault, exposing the tail roadway and other common complex geological conditions ，By strengthening the working face through fault and expose the tail roadway engineering quality management, Tracking measuring method to control working face cutting Layer， 53 next 07 ( northern ) working face expose the tail roadway along the working surface glue along the tail roadway roof advance, No original support failure and collapse phenomenon， Practice shows that the working face through fault and expose the tail roadway, must strengthen project quality management, to take specific measures, in order to create the conditions for safe production of mining working face. Reference | Related Articles | Metrics

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Study on Inclined -Groove Depth During the Mining Panels Turning in Surface Mine COAL ENGINEERING    2014, 46 (7): 88-90.   DOI: 10.11799/ce201407029 Abstract （648）      PDF （435KB）（1014）       Knowledge map    The best economic models of groove depth is established based on groove inclined turning’s feature and the criterion of groove depth depend on the principle that the production stripping ratio is not greater than the economic stripping ratio.It is identified that the total benefit is a cubic function of the groove depth and the computing formula of the best groove depth is derived. Last the analysis of a mine’s actual situation demonstrates the usefulness of the model . Reference | Related Articles | Metrics

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Research on the type of undergroud work in coal industry COAL ENGINEERING    2013, 45 (4): 87-89.   Abstract （966）      PDF （574KB）（931）       Knowledge map    Abstract:This study investigated the problems of the frequence of coal mine accidents and the operations of workers that against the rules, and then point out the deep reasons which are those three aspects: types of underground work are undefined clearly; worksare not carried out properly; the safety funds are insufficient. By means of some related rules about coal mine safety work which has executed by the State Administration of work safety and some coal mine worker training files by other local government, a total of 71 types of worker are defined, and give a further suggestion. Makesure the coal mine workers understand their job and responsibility to a higher degree,then can applythe safety training more effective, and finally improve the safety level. Related Articles | Metrics

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COAL ENGINEERING    2013, 45 (2): 126-128.   Abstract （351）      PDF （522KB）（1046）       Knowledge map    Reference | Related Articles | Metrics

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development and industrial location selection of Xiao Jia Wa coal mine COAL ENGINEERING    2014, 46 (10): 74-77.   DOI: 10.11799/ce201410019 Abstract （713）      PDF （1379KB）（868）       Knowledge map    Reference | Related Articles | Metrics

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Study on Characteristics of the performance of the Electric Unit Pump Explosion-proof Diesel Engine COAL ENGINEERING    2015, 47 (10): 100-103.   DOI: 10.11799/ce201510032 Abstract （530）      PDF （2358KB）（651）       Knowledge map    Due to a few changes in the electric unit pump system of the original mechanical fuel injection system of diesel engine structure, with relatively low demand for fuel quality, and with stably mission, it is suitable for the flameproof diesel engine. With the explosion protection system introduced, the performance of the electronic control unit pump diesel engine is reduced, and the emission is increased. In which an average of 6.06% of the torque is fell, and an average of 8.28% of the power, and the fuel consumption rate is increased by an average of 2.67%, and CO is increased by an average of 170%, and NOx is increased by an average of 7.78%. There is little influence on the fuel injection quantity and injection pressure of the electronically controlled unit pump diesel engine with fuel injection timing by AMESIM simulation model. The injection timing characteristics of the electronic control unit pump fuel under different rotational speed is used for the reasonable matching in fuel injection timing and injection pulse width, to some extent, which compensate the loss of the performance in the working conditions after the explosion-proof system added in the electric unit pump diesel engine, as well as the emissions improved within a certain scope, and the best matching point of the torque working condition and the rated conditions obtained. Reference | Related Articles | Metrics