State Key Laboratory of Deep Coal Mining and Environment Protection

Huainan, China

State Key Laboratory of Deep Coal Mining and Environment Protection

Huainan, China

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Tang Y.,State Key Laboratory of Deep Coal Mining and Environment Protection | Tang Y.,Taiyuan University of Technology
World of Mining - Surface and Underground | Year: 2017

Coal and gas outbursts, as a kind of disasters generally found in highly gassy mines around the world, have significantly influenced safe, efficient production of mines. By using sodium humate as the cementing agent to prepare the briquettes, this study physically simulated the process of coal and gas outburst using a self-made equipment. In addition, orthogonal experiments were carried out to analyze the main factors influencing outbursts. Results showed that no outbursts occurred before the gas pressure reached 0.75 MPa. When the gas pressure and crustal stress were equal to 1.0 MPa and 20 MPa, separately, coal and gas outbursts occured with an intensity being 26.7 kg·m and farthest distance of 14.1 m. Moreover, it was found that the energy in the outburst process continuously attenuated. Acoording to the orthogonal test, gas pressure is the primary factor controlling coal and gas outburst process. When the water content in coal grew to 4 %, the outburst intensity rapidly reduced, indicating that increasing the content of water in coal is conducive to controlling outburst disasters.


Yuan L.,China University of Mining and Technology | Yuan L.,China Coal Research Institute | Yuan L.,State Key laboratory of Deep Coal Mining and Environment Protection | Yuan L.,National Engineering Research Center for Coal Gas Control
Meitan Xuebao/Journal of the China Coal Society | Year: 2017

As the Internet plus era and intelligence development are intensified in the new century, this research investigates how coal mining copes with the advent of a new round of science and technology innovation by summarizing the history of coal mining and the technological development trends therein. A scientific concept of precise coal mining is proposed to meet the challenges and opportunities facing coal mining in China. By means of technologies including intellisense, intelligent control, the Internet of Things, cloud computing and big data, precise coal mining is proposed as a new future mining mode integrating intelligent mining technique with few workers(unmanned), and disaster prevention and control. This mode is based on transparent spaces and geophysics, as well as multi-field coupling to achieve spatial-temporal accuracy and efficiency. It is able to comprehensively consider factors relating mining under different geological conditions, including mining influences, relevant factors inducing disasters, and ecological destruction caused by exploitation: it is able to enhance the automatisation, intelligentisation, and informatization levels of safe coal production which promotes the transformation of the coal industry from a labor-intensive, to a technology-intensive sector. The research proposes seven key scientific problems and eight major research directions for coal mining and therefore directs the technology route for future science-based mining with few people (unmanned) in the Internet plus era. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.


Liu C.,Xi'an University of Science and Technology | Liu C.,Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education | Xue J.,State Key Laboratory of Deep Coal Mining and Environment Protection | Yu G.,State Key Laboratory of Deep Coal Mining and Environment Protection | Cheng X.,Xi'an University of Science and Technology
International Journal of Mining Science and Technology | Year: 2016

In order to study the evolution laws during the development process of the coal face overburden rock mining-induced fissure, we studied the process of evolution of overburden rock mining-induced fissures and dynamically quantitatively described its fractal laws, based on the high-precision microseismic monitoring method and the nonlinear Fractal Geometry Theory. The results show that: the overburden rock mining-induced fissure fractal dimension experiences two periodic change processes with the coal face advance, namely a Small → Big → Small process, which tends to be stable; the functional relationship between the extraction step distance and the overburden rock mining-induced fissure fractal dimension is a cubic curve. The results suggest that the fractal dimension reflects the evolution characteristics of the overburden rock mining-induced fissure, which can be used as an evaluation index of the stability of the overburden rock strata, and it provides theoretical guidance for stability analysis of the overburden rock strata, goaf roof control and the support movements in the mining face. © 2016 Published by Elsevier B.V. on behalf of China University of Mining & Technology.


Yuan L.,State Key Laboratory of Deep Coal Mining and Environment Protection | Yuan L.,National Engineering Research Center for Coalmine Gas Control
Journal of Rock Mechanics and Geotechnical Engineering | Year: 2016

Coal extraction in Huainan area is basically characterized by one of typical multi-seam mining conditions observed in China, where coal is mined in soft seams characterized by high gas content, high stress, low permeability and difficult geological conditions. The average mining depth in Huainan area is 875 m and continues to increase by 15–25 m annually. The rise in mining depth increases the risk of coal and gas outbursts and makes it more difficult to control outburst risk in Huainan coalmines. This paper reviews the main achievements (e.g. theories, technologies and equipment) in outburst control in Huainan, and tries to analyze some key challenging issues, and to present associated strategies to address these issues. It suggests that the outburst control in Huainan must take a combination approach of both regional and localized control in which the former plays a dominant role. Other outburst prevention principles include (1) non-outburst seams protecting outburst seams, (2) less outburst-prone seams protecting strong outburst-prone seams, (3) stress-releasing mining, and (4) the combination of ground and underground gas drainage (the model is dubbed as “walking on two legs”). The paper concludes that we should conduct fundamental researches on outburst mechanism, and develop outburst control technologies and equipment to ensure safe and efficient coal mining of deep coal resources in Huainan area. © 2016 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences


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.


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.


Xue J.-H.,State Key Laboratory of Deep Coal Mining and Environment Protection | Duan C.-R.,State Key Laboratory of Deep Coal Mining and Environment Protection
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

To solve the disasters about hanging roof in goaf, gas concentration exceeding limits and stress concentration caused by setting coal columns in the mining condition of 10 m thickness limestone roof covered directly, the author proposed the method of gob-side entry retaining with no-pillar by forced roof caving. After cutting off the connection between the roof above gob-side entry and the immediate and main roofs, by advanced pre-split surface, and the side of entry will formed under the action of periodic weightings, which can separate the goaf and support the overlying moving strata, and improve the surrounding rock stress environment. Technologies of gob-side entry retaining with no-pillar in condition of overlying and thick-hard roof has been widely applied in Jincheng mining area. ©, 2014, Meitan Xuebao/Journal of the China Coal Society. All right reserved.


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.


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.


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.

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