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Du S.,Taiyuan University of Technology | Zhang J.,Taiyuan University of Technology | Deng Z.,China Coal Pingshuo Group Co. | Li J.,China Coal Pingshuo Group Co.
International Journal of Engineering Research in Africa | Year: 2014

Extreme learning machine (ELM), as an emergent technique for training feed-forward neural networks, has shown good performance on various learning domains. This work evaluates the effectiveness of a new Gaussian kernel function-based extreme learning machine (KELM) algorithm for the deformation prediction of mine slope surface utilizing various kinds of meteorological influence factor data including the temperature, atmospheric pressure, cumulative rainfall, relative humidity and refractive index of the mining slope. The KELM model was applied to the deformation of Anjialing diggings, which is an open-pit mine of the China Coal PingShuo Group Co., Ltd. in China. The prediction performance on real data suggests that the proposed KELM model can effectively express the non-linear relationship between the mine open-pit slope surface deformation and various kinds of meteorological influence factors. The prediction results are compared with the most widely used algorithms - Support vector machine (SVM) and backpropagation neural networks (BP NN) in terms of the ease of use ( for example, the number of userdefined parameters), regression accuracy and computation cost. The comparison shows that the new algorithm is similar to SVM and BP NN but more accurate, and has notable lower computational cost and stronger generalization ability. © (2014) Trans Tech Publications, Switzerland.


Du S.,Taiyuan University of Technology | Zhang J.,Taiyuan University of Technology | Deng Z.,China Coal Pingshuo Group Co. | Li J.,China Coal Pingshuo Group Co.
Elektronika ir Elektrotechnika | Year: 2014

The monitoring and forecasting of the mining slope deformation are of great significance to prevent potential geological disasters in mining regions and the geological factors have been widely used for the purpose of mining slope deformation monitoring. However, literature review shows that very little work has been done in prediction of mining slope deformation using meteorological factors. To address this issue, a new method is proposed using the meteorological factors to forecast the mining slope deformation. Herein, the meteorological factors include the temperature, atmospheric pressure, cumulative rainfall, relative humidity and refractive index of the mining slope. A genetic algorithm optimized BP neural network (GA-BPNN) was employed to fuse the meteorological factors to establish the prediction model for the mining slope deformation. The experiments have been implemented to evaluate the new approach and a comparison between the GA-BPNN, BPNN and radical basis function neural network (RBF) prediction models has been carried out. The analysis results show that the proposed method can provide precise prediction of the mining slope deformation and its performance is superior to its rivals.


Zhao H.-Z.,China University of Mining and Technology | Zhang R.-X.,China University of Mining and Technology | Liu X.-Q.,China Coal Pingshuo Group Co. | Zhen X.,China University of Mining and Technology | Zhen X.,China Coal Research Institute
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

According to the sharp dropping coal seam and peaking stripping ratio caused by complicated geological conditions, which can not be solved by regulating the stripping and mining with traditional advance stripping method, a method of double pits dynamic regulating mode based on the basic principles of surface mine was put forward, and then, double pit-leaping mining mode and it's applicable conditions and key factors were detailed analyzed. The coal seam of Antaibao Surface Coal Mine in China changes from flat seam to sharp dropping seam during the mining area of Luzigou anticline. Combining with the surface mine problems that occurred during the anticline mining area, this paper took Antaibao Surface Coal Mine as a case study. The results show that the stripping ratio is balanced and the production keeps stability, moreover, the economic benefit is improved with double pits dynamic regulating mode in sharp dropping seam surface mine.


Wang J.-M.,Taiyuan University of Technology | Zhang J.,Taiyuan University of Technology | Deng Z.-B.,China Coal Pingshuo Group Co. | Wang Y.-T.,China Coal Pingshuo Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Slope deformation analyses based on monitoring points are unscientific because of limited monitoring points and unreasonable layout. Therefore, the interpolation of deformation information from monitoring points is very necessary. In this paper, the space-time Kriging interpolation was used to analysis slope deformation in Pingshuo Open-pit Mine instead of classic Kriging interpolation. The space-time variograms function using the space-time of 2D product-sum method was established, and the relationship between the main parameters of the model and the deformation was analyzed. The results show that the accuracy of space-time Kriging interpolation is satisfactory when the temporal-spatial relevance is considered. Accordingly, the dynamic deformation models were established based on the grid points of the monitoring area. The models are important for the analysis of slope stability from the regional scale.


Ge S.,LIAONING Technical University | Ge S.,Motive | Gao Z.,LIAONING Technical University | Gao Z.,Motive | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2016

The down-to-hole (DTH) drill is the most frequently utilized drill in open-pit mines, where drilling dust is one of the main dust sources. The Pingshuo Anjialing Open-pit Mine, an area where dust pollution is very serious, was chosen as the experimental spot. In order to obtain the optimal drilling-dust-removal scheme, numerical simulation was combined with field measurements. Eulerian and DPM methods were used for developing a gas-solid two-phase flow model to study the drilling-dust-diffusion rule and dust-removal efficiency. Based on particle tracking technology, a cyclonic bag, two-stage dust removal mechanism was quantitatively analyzed by comparison with a cyclonic one-stage dust-removal system. The results show that the total drilling-dust-removal efficiency was up to 99.7% and that the respirable-dust-removal efficiency was up to 94.7%, after the two-stage dust removal scheme was applied. The total dust-removal efficiency of the two-stage dust-removal scheme increased by 47%, and the respirable-dust-removal efficiency increased by 56%, compared to the one-stage dust-removal system. Ultimately, the dust concentration met the national standard. © 2016, Science Press. All right reserved.


Chen X.,LIAONING Technical University | Chen X.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Ge S.,LIAONING Technical University | Ge S.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

For the high concentration of dust source, it needs to arrange multi-nozzle for co-inhibition which usually accompanied by interference phenomenon. The mutual collision and re-breaking of droplets plays an important role in the process of removaling dust. Meanwhile, the number and location of nozzles affect the whole effect of atomization remarkably. In order to comprehend the series of dynamic events in the process of droplet movement, the UDF method on the basis of collision model, breakup model and evaporation model were used to make numerical simulation for spray field. The simulation results show that the increase of nozzle numbers can appropriately improve the uniformity of particle diameter distribution, then to improve dust removal efficiency. With the increase of atomizing pressure, the initial kinetic energy of droplets increased, which had a good dust removal effect for the respirable dust of less than 5 μm.


Zhao Q.F.,North China Institute of Science and Technology | Wang Y.H.,North China Institute of Science and Technology | Liu Y.D.,North China Institute of Science and Technology | Li H.T.,North China Institute of Science and Technology | And 2 more authors.
Progress in Mine Safety Science and Engineering II - Proceedings of the 2nd International Symposium of Mine Safety Science and Engineering | Year: 2014

In order to control the severe floor heave of large cross section mining roadway in No. 1 Coal Mine of China Coal Ping-shuo Group Co., ltd, the various controlling measures are simulated by numerical simulation software FLAC, such as floor bolting, pressure-relief groove and floor drilling, and the stress distribution and displacement characteristics of the roadway floor are analyzed in the condition of different measures. Additionally the combinatorial controlling measure of reinforcement method (floor bolting) and pressure relief method (pressure-relief groove) is put forward. The engineering test results show that the maximum displacement and the maximum rate of floor heave are within the controllable range. Thus the combinatorial controlling technique can effectively control the floor heave and keep the surrounding rock stable. © 2014 Taylor & Francis Group.


Tian D.,University of Science and Technology of China | Zhao Q.,University of Science and Technology of China | Shao G.,China Coal Pingshuo Group Co. | Shi H.,University of Science and Technology of China | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2015

According to the site measured strata pressure information of the coal mining face in mining efflorescent oxygenized zone of coal seams in No.3 Coal Mine of China Coal Pingshuo Group Co. Ltd, the paper has discussed the obvious sectional variance features occurring in top coal and the overlying strata above mining face in efflorescent oxygenized zone, such as loose strata structure, low overburden rock strength, high plasticity property, strong hydrophilicity, serious sliming, and the obvious decrease of stability performance and bearing capacity. The mine strata-pressure behaviors of passing the efflorescent oxygenized zone of coal seams are mainly reflected in the following three aspects: periodic weighting distance shortened, both the maximum working resistance of hydraulic power support during roof pressurized period and the average working resistance during non-pressurized period increasing, and support dynamic load coefficient decreasing during passing the efflorescent oxygenized zone compared with outside the scope. The mechanism of the sectional variance in strata behaviors have been analyzed by using geological mechanics, from which the paper has shown that the geological incentive of the strata-pressure behaviors variability is the new type Soft Cushion effect caused by soft-broken surrounding rock, fractured and sliming rock mass and float coal auxiliary compression under the floor. The Soft Cushion effect will lead to lower working resistance of the supports. Then the characteristics of the support operation of working face have been analyzed and the adaptability of the powered supports has been assessed. ©, YYYY, China University of Mining and Technology. All right reserved.


Yang M.,XJ Electrical Co. | Sun Z.-J.,Chinacoal Pingshuo Group Co. | Li N.,XJ Electrical Co. | Liu W.-P.,XJ Electrical Co. | Liu J.,XJ Electrical Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

Firing pulse is one of the key technologies of HVDC valves control as well as the research emphasis of domestic control and protection platform. This paper briefly introduces the generating principle of firing pulse used for valve control in HVDC transmission system, based on which the resolution about phase integrator and PLL tracking controller and their functions during the process of the firing pulse generation are analyzed. At last, the significance of equidistance pulses in 6 pulses system is analyzed, as well as how to minimize the equidistance error. This paper gives corresponding testing methods based on the design. Combining theory with practice, this paper describes the generation principle of firing pulse and the realization method, which provides a strong support for realizing home-made production for HVDC control and protection system.

Loading China Coal Pingshuo Group Co. collaborators
Loading China Coal Pingshuo Group Co. collaborators