矿井可采煤量规划问题探析

结合福建龙岩罗厝山煤矿的实际情况,研究用动态规划理论合理安排可采煤量大小,使可采煤量既能满足煤矿生产任务的需要,又能使巷道的掘进与维护总费用最小,从而较好地解决采煤与掘进这一煤矿生产矛盾。

关于煤层可采煤样和分层煤样在铁法矿区适用性的对比分析

针对井下煤质管理中煤层可采煤样的操作难度和准确性进行了论述,列举了采取煤层分层煤样的有利条件,并对可采煤样和分层煤样的准确性进行了对比分析。

云南大关县戍成煤矿特征及其工业意义

戍成煤矿位于云南省大关县煤系地层为下石炭统大塘组旧司段(C_1d_j),于该层上部夹一层可采煤层(M_2),属无烟煤,煤层厚可达1.20m,煤层结构单一明晰,厚度、层位相对稳定,矿区地质构造简单。各种有利的条件表明,本矿区值得进一步开展地质勘查和资源开发。

云南大关县石灰煤矿特征及煤层对比

石灰煤矿位于云南省大关县,矿区地质构造为一简单的宽缓向斜;矿区煤系地层为石炭系下统旧司段(C1dj),该地层中产2层煤,从上至下编为M1煤层和M2煤层,M2煤层为可采煤,厚0.71m^1.75m。煤层结构单一,厚度及层位相对稳定,煤质牌号属无烟煤类WY3。

扎哈淖尔露天矿电铲作业方式的优化

扎哈淖尔露天矿2013年末对电铲作业方式进行调整,增加了电铲作业面数量,创新电铲作业方式,调整了露煤台阶的高度,从而达到降低倾斜煤层的开采难度,同时增加揭露煤层总量,旨在实现采掘设备效率的同时,增加采场可采煤量,为生产良好接续提供有力保障。

井下煤层煤样采取和煤质计划管理初探

介绍了鹤岗矿业集团根据井下夹石层厚度和岩石硬度合理采取井下煤层煤样,提高了煤质计划的准确性,稳定了动力煤的质量。

计算机处理煤层煤样化验数据的应用

介绍同煤集团利用计算机处理煤层煤样数据软件的功能。

工作面煤样的采取及灰分计划的确定

通过对工作面可采煤样采取方法的探讨 ,使可采煤样的采取方法更加科学合理 ,对于准确掌握工作面煤质情况 。

京东煤矿生产规模与服务年限分析

介绍京东煤矿各采区现有可采煤量,矿井的生产规模和服务年限,指出如何稳定矿井生产规模,延长矿井服务年限,为矿井生产发展后劲进行分析,为深入矿井存量资源挖潜提供借鉴。

Fuzzy Evaluation of Coal Seam Geological Condition of Fully-Mechanized Face in Ten-Million-Ton Mine

Based on coal seam geological condition and mining technological characteristic in Jisan Mine, coal seamgeological condition is quantitative evaluated by using fuzzy evaluation with the view of coal mining and coalfaceproduction. The structure and index system of evaluation factor, the membership functions and weights of evaluationfactor, evaluation model and reliability in the coal seam geological conditions are expounded in detail. Eighty-twocoalfaces which will be exploited is classified. All of these have provided a theoretical foundation for the selection ofcoal mining technology and for sustainable development of the coal mine.

Reliability modeling of hydraulic system of drum shearer machine

The hydraulic system plays an important role in supplying power and its transition to other working parts of a coal shearer machine. In this paper, the reliability of the hydraulic system of a drum shearer was analyzed. A case study was done in the Tabas Coal Mine in Iran for failure data collection. The results of the statistical analysis show that the time between failures （TBF） data of this system followed the 3-parameters Weibull distribution. There is about a 54% chance that the hydraulic system of the drum shearer will not fail for the first 50 h of operation. The developed model shows that the reliability of the hydraulic system reduces to a zero value after approximately 1 650 hours of operation. The failure rate of this system decreases when time increases. Therefore, corrective maintenance （run-to-t^ailure） was selected as the best maintenance strategy for it.

Application of 3D Visual Techniques in Daliuta Coal Mine

3D visualization is one of major problems in “Digital Mine” theory and its technological research field. Through the observation of 3D geological models, spatial structural information, connected with the information of production management hidden in geological data, could be detected. In order to meet the requirement of more efficient coal exploration, a case study of geological characters of the Daliuta Coal Mine is presented in which 3D visual models of the ground surface and geologic bodies are established on the basis of data models and data structures of 3D geology modeling. The main conclusions of this study are as follows: (1) Through analysis and organization of spatial discrete data, the drillhole database is designed with the data of the Daliuta mine; the connections amomg drillhole data are real- ized and displayed in a 3D environment. (2) Combining real data of the Daliuta mine, drillhole visualization is realized in a 3D environment by using the CoalMiner system. (3) The ground surface modeling of the Daliuta coal mine adopted a surface-data model and a TIN data structure. (4) 3D models of coal seams and rock formations of the Daliuta mine are established, which provide a method for the simulation of complex surfaces of geologic bodies. In the end, the models are applied to the Daliuta coal mine and the result shows that better geological effects are obtained.

Research on the gas desorption law of the consumingly destruct coal

To solve the issues of calculating gas loss quantity during sampling,simulated gas desorption process of the consumingly destruct coal with the assembly simulation testing device.Through an analysis of the simulation test datum using SPSS software, established a new formula that can be better description on gas desorption process,more accurate calculation of the gas loss quantity during sampling process,and calculating re- leasable gas quantity during a certain period.Aimed at the new formula,the best time of taking sample is confirmed 3 minutes for consumingly destruct coal,the computative error is less than 10%.Through experiment at laboratory and locale,the new formula could well describe consumingly destruct coal gas desorption law,and it has high calculation preci- sion of gas loss quantity in sampling and desorption quanlity.

Reliability and maintainability analysis of electrical system of drum shearers

The reliability and maintainability of electrical system of drum shearer at Parvade. 1 Coal Mine in central Iran was analyzed. The maintenance and failure data were collected during 19 months of shearer operation. According to trend and serial correlation tests, the data were independent and identically distributed （iid） and therefore the statistical techniques were used for modeling. The data analysis show that the time between failures （TBF） and time to repair （TTR） data obey the lognormal and Weibull 3 parameters distribution respectively. Reliability-based preventive maintenance time intervals for electrical system of the drum shearer were calculated with regard to reliability plot. The reliability-based maintenance intervals for 90%, 80%, 70% and 50% reliability level are respectively 9.91, 17.96, 27.56 and 56.1 h. Also the calculations show that time to repair （TTR） of this system varies in range 0.17-4 h with 1.002 h as mean time to repair （MTTR）. There is a 80% chance that the electrical system of shearer of Parvade. 1 mine repair will be accomplished within 1.45 h.

Research and application on integration modeling of 3D bodies in coal mine with blended data model based on TIN and ARTP

Data modeling is the foundation of three-dimensional visualization technology. First the paper proposed the 3D integrated data model of stratum, laneway and drill on the basic of TIN and ARTP, and designed the relevant conceptual and logical model from the view of data model, and described the data structure of geometric elements of the model by adopting the object-oriented modeling idea. And then studied the key modeling technology of stratum, laneway and drill, introduced the ARTP modeling process of stratum, laneway and drill and studied the 3D geometric modeling process of different section laneways. At last, the paper realized the three-dimensional visualization system professionally coalmine-oriented, using SQL Server as background database, Visual C＋＋6.0 and OpenGL as foreground development tools.

Research on 3D Modeling and Visualization of Coal Pillars for Surface Protection

In order to safely exploit coal resource, protection coal pillars must be prepared in coal mines. Some correlative parameters of protection coal pillar are calculated by Drop face and Drop line methods. Models of protecting surface objects and coal pillars are established by TIN modeling and object-oriented technique. By using ACCESS2000as the database and the VC＋＋ and OpenGL as the language, the calculation of protective coal pillars is realized and the 3D-visulizaiton system for protected objects on ground surface and for coal pillars is developed. The system can obtain the data of characteristic points on the surface interactively from the digitized mine topography map, constructing 3D model automatically. It can also obtain the interrelated parameters of the coal seam and drill hole data from existing geolog!cal surveying database to calculate the location, surface area and the total coal columns. The whole process can be computed quickly and accurately. And the 3D visualization system was applied in a mine, showing that the system solve the problem of complex calculation, not only realized the automatic 3D mapping and visualization of coal pillars for buildings protection, but also greatly improves the working efficiency.

Reliability analysis of the velocity matching of coal cutting and caving in fully mechanized top-coal caving face

The matching relationship between coal cutting and caving in fully mechanized top-coal caving face is analyzed in detail from the angle of reliability. The coupling equation of reliability is established correspondingly, and the mathematical equation of the coefficient of velocity matching of coal cutting and caving is obtained, which meets a certain reliability demand for making the working procedure of coal caving not influence coal cutting of coal-cutter. The results show that the relationship between the coefficient of the velocity matching and the reliability of coal cutting and caving system is linear on the whole when R <0.9. It is pointed out that different numerical value should be selected for different coal face according to different demand for reliability.

The Research of thick seam mining methods

China＇s total coal reserves are enormous, in which recoverable reserves of coal seam thickness ofmineable coal reserves in China accounted for 43% of recoverable reserves When correctly using thick seam mining, mining methods can improve the proper thick seam mining rate and reduce coal loss. Using proper thick seam mining method can effectively reduce the thick seam mining costs. In mining safety, the use of appropriate thick seam mining methods can effectively prevent thick seam mining accidents. But in the process of development and current situation from the perspective of the Chinese coal mining, there are certain aspects of thick seam mining problems. These problems are mainly in the thick seam mining and the coal recovery rate is low, resulting in lots of waste coal. Besides, thick coal mining is less secure, safe and there are frequent accidents. These problems have seriously affected the thick seam mining. And a lot of thick coal seams of coal resources can not be effectively taken out. Now Chinese mining methods in thick seam mining areas are mainly open-pit mining and underground mining exploitation. Because of the open-pit coal burial depth has more stringent requirements, only used in shallow-depth areas. Underground mining is the primary way China is now using in thick seam mining. Underground mining methods include full-height slice mining and mechanized mining caving mining method once adopted. Research on these thick seam mining methods can provide theoretical and technical support for thick seam mining, thick seam mining techniques to enhance the level . I will combine the current situation of thick seam mining in Chinese study with thick seam mining methods, comments and suggestions for the current thick seam mining study

Sensing for advancing mining automation capability:A review of underground automation technology development

This paper highlights the role of automation technologies for improving the safety, productivity, and environmental sustainability of underground coal mining processes. This is accomplished by reviewing the impact that the introduction of automation technology has made through the longwall shearer automation research program of Longwall Automation Steering Committee(LASC). This result has been achieved through close integration of sensing, processing, and control technologies into the longwall mining process. Key to the success of the automation solution has been the development of new sensing methods to accurately measure the location of longwall equipment and the spatial configuration of coal seam geology. The relevance of system interoperability and open communications standards for facilitating effective automation is also discussed. Importantly, the insights gained through the longwall automation development process are now leading to new technology transfer activity to benefit other underground mining processes.

Visible light induced TiO_2 pillared MMT photocatalyst coupling-doped with S and N

Visible light induced titanium dioxide (TiO2) pillared montmorillonite clay (MMT) photocatalyst coupling-doped with S and N elements was prepared by the two-step ad- sorption method.The photocatalyst was characterized by X-ray photoelectron spectros- copy (XPS) and ultraviolet-visible (UV-vis) absorption spectroscopy.The photocatalysic ef- ficacy of the prepared photocatalyst for degrading gaseous formaldehyde was evaluated under visible light irradiation.The degrading rate of gaseous formaldehyde is nearly 85% in 300 min visible light irradiation.The results demonstrate that the much higher visible light photocatalytic activity of the photocatalyst is due to the synergistic effects of coupling- doping of S and N elements to TiO2,extensive specific surface area of MMT and quantum sized efficacy between layers of MMT.