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Luo Y.,State Key Laboratory of Deep Coal Mining and Environment Protection | Luo Y.,National Engineering Research Center for Coal Gas Control | Luo Y.,Huainan Mining Group Co.
Journal of Coal Science and Engineering | Year: 2012

Aiming to effectively solve the problem of deep mining with safety and high efficiency, according to geological conditions, production and stress analysis in roadway surrounding rock, experimental studies on roadway supporting of workface 103 under three types of roof conditions with different supporting technologies and parameters were carried out based on the theory of supporting technology of gob-side entry. The results show the supporting of gob-side entry retaining is successful, and the deep surrounding rock is effectively controlled by field monitoring and drilling-hole photos. After stress in surrounding rock of roadways restores stable, the final roadway deformation of surrounding rock of haulage roadway and air-roadway are both about 300 mm; width of gob-side entry is 3.8-4.0 m and average height is 2.0-2.2 m; roadway section is above 8.0 m2, which solves the problems of gob-side entry retaining support strength and safe mining; necessary conditions of mining safety in workface 103 are met. © The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg 2012. Source


Xue J.,China University of Mining and Technology | Xue J.,State Key Laboratory of Deep Coal Mining and Environment Protection | Xue S.,CSIRO
Advanced Materials Research | Year: 2012

To address the issue of high gas emissions in mining gassy coal seams in underground coal mines, the concept of a three-entry panel layout with a retained goaf-edge gateroad and a "Y" type ventilation system is introduced in this paper. With the layout and ventilation system, distribution characteristics of methane concentration in the panel goaf is analyzed, technologies of gas drainage with boreholes drilled from the retained goaf-edge gateroad and into stress-relieved overlying and underlying seams are described, and an application case of such layout in a coal mine is also presented in this paper. © (2012) Trans Tech Publications. Source


Xue J.,China University of Mining and Technology | Xue J.,State Key Laboratory of Deep Coal Mining and Environment Protection | Xue S.,CSIRO
Advanced Materials Research | Year: 2012

In underground coal mining, a goaf-edge gateroad (GEG) in a longwall panel is often retained in full length, i.e. the length of the retained GEG is the same as the length of longwall block, for ventilation and gas control. In some cases, it can be extremely difficult to retain a GEG in its full length due to complex geological and geotechnical conditions. To address the issue, the concept of retaining a GEG in sections is introduced. The retained length of a GEG is optimised through the analysis of the inner and outer structures of surrounding rocks of the GEG. Retaining a GEG in sections avoids the intensive roof movement period and possible structural failure of its support. This method of retaining a GEG in sections was successfully applied in panel 24202 of Shaqu coal mine. © (2012) Trans Tech Publications. Source


Xue J.-H.,China University of Mining and Technology | Xue J.-H.,State Key Laboratory of Deep Coal Mining and Environment Protection | Han C.-L.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

Combined with the production conditions of 24207 working face in Shaqu mine, distribution characteristics of roofs stress for gob-side entry retaining influenced by mining height was studied by the method of theoretical analysis and numerical simulation. Gob-side entry retaining is in the area of stress decreasing zone of bearing pressure area. The impact scope and range to the rock gets more widely with the increase of mining height of working face. Acute deformation will occur during the mining period for gob-side entry retaining, and the contraction of area will reach to 55.3% in the condition of large mining height. Effective supporting measures are required according to the deformation characteristics of each side in gob-side entry retaining. The optimal cross-height ratio and the high strength supporting system with the core of high pre-stress could be helpful to control the deformation of surrounding rock reasonably. The observation data shows that the violent mining influence extent to gob-side entry retaining is the ranges from working face to the rear of 200 m, which is similar to the length of working face in the industrial experiment. The deformation continues to grow and roof pressure continues to increase until the length extents 250 m the strata behaviors tends to stable. Source


Xue J.-H.,China University of Mining and Technology | Xue J.-H.,State Key Laboratory of Deep Coal Mining and Environment Protection
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

There are a number of challenging technical issues in mining the first seam with a high cutting single pass longwall method in thick and multiple gassy seams of short intervals in the western region of China. These issues include the stability of retained gateroads and the quantification of the extent and degree of destressed zones in surrounding strata. To gain an insight of these issues, a theoretical and numerical study was undertaken for a 4.2 m cutting height face to understand the propagation and evolution of fractures around the face, to characterize the fracture distribution, and to map out the zones of high gas concentrations in the goaf. Based on these findings, a group of large diameter (φ=250 mm) boreholes drilled into the zones, instead of conventionally expensive gas drainage tunnels, are successfully used to capture the goaf gas. A total of 11.669 5 million cubic meters gas is captured with the boreholes, a total of 677 000 tons of coal is efficiently extracted without any gas issue, and integrated coal and gas extraction is achieved. Source

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