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Taiyuan, China

Wang P.,University of Science and Technology Beijing | Jiang F.-X.,University of Science and Technology Beijing | Wang C.-W.,University of Science and Technology Beijing | Wang L.-F.,Mining Company | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

Based on the analysis of strata spatial structure movement, not only forecasted the discipline of strata motion in 9303LW, but also presented the predicting results of potential zones and risk level of rock burst in 9303LW. 9303LW is a top coal mining longwall face of Nantun Coal Mine, Yanzhou Coal Mining Group. The predicting results of potential zones of rock burst is pre-unloading. On this basis, stress increment method that main contains the borehole stress increment, value of drilling cuttings weight and dynamic phenomena which happens in the drilling method process can forecast rockburst of the working face accurate. Owing to pre-stress-relief, monitoring inspection and protection in advance, when 2.6 grade of mine quake happeded, sucessfully avoid from coal out burst induced by mine quake disaster, achieve the aims of avoiding dynamic disaster. Source


Wang H.,CAS Wuhan Institute of Rock and Soil Mechanics | Li X.,CAS Wuhan Institute of Rock and Soil Mechanics | Mi Z.,Mining Company | Bai J.,Mining Company | Wang S.,Northern Engineering and Technology Corporation
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Based on the investigation, test and numerical analysis of the mine dumps, it is believed that the key of disaccord between results from the 2D-LEM and reality is system spatial effect under the interaction of base and dump body. The spatial clamp effect of convex and divergent effect of concave are explained, as well as essential relationship between height and radius of curvature which should be abided by 2D or 3D stability analysis is given on the basis of field test, theoretical analysis and physical model. Furthermore, the safe class, evaluation criterion and technical route which takes the factor of stability as major and also considers stress, displacement fields and plastic region distribution is established, under the principle that the deformation and partial failure are allowable. Source


Agacayak T.,Selcuk University | Koseler M.,Mining Company
Journal of the Chemical Society of Pakistan | Year: 2015

Summary: In this study, the leaching conditions of Sivrihisar (Adatepe) limonite type lateritic ore in acidic medium were investigated. Leaching experiments were carried out using conventional and microwave-assisted method. The effects of stirring speed, leaching temperature, perchloric acid concentration, solid/liquid ratio and particle size on conventional leaching were determined. Microwave-assisted leaching was carried out by using the optimum results of the conventional leaching. The pre-heating process was applied on different microwave powers (0, 90, 180, 360 and 600 W) and pre-processing time (0, 1, 3, 5, 7, 10, 15 and 20 min). These experimental results demonstrated that acid leaching was a convenient method for Ni extraction from lateritic ore. The higher dissolution and the higher Ni recoveries in the microwave-assisted leaching process were obtained in less leach time. © 2015, Chemical Society of Pakistan. All rights reserved. Source


Wang H.-B.,CAS Wuhan Institute of Rock and Soil Mechanics | Li X.-C.,CAS Wuhan Institute of Rock and Soil Mechanics | Mi Z.-J.,Mining Company | Yang L.-Y.,Mining Company | Yang Z.-L.,Mining Company
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The south waste dump of Jianshan Iron Mine located on weak loess slope foundation due to the unique-selection of the dump site, various degree failures sequentially occurred since 2008. Based on engineering analogism, in-situ investigation, field monitoring and tracking geologic survey technology were used to research the landslide formation evolution mechanism of the waste dumps located on loess foundation, specially the landslide types and failure modes (low-speed and slight-starting, rotational and retrogressive mode), formative mechanism and conditions(overload and lateral compression leading, precipitation trigger), landslide procedure, feature and distribution regulation (supporting course creep-floor heave-loess ridge tensile fracturing-rotational sliding -crack propagation-slip plane-retrogressive fallout). Starting with effect interaction characteristics between the waste dump and the loess slope foundation, the limit height of dumping-site determined by theoretical formula, failure range estimated by engineering analogism and statistical analysis, influence degree on environmental(equipments, human beings, building, etc.) were studied. It was the key countermeasure to adjust and control course safety of substructure, such as intelligently using dumping-site space, adjusting time-space relation during waste dumps emission, controlling emission speed. The conceptual design is submitted that moderately failure should be permitted. Source

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