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Lan H.,Tiandi Science And Technology | Lan H.,China Coal Research Institute | Du T.-T.,Tiandi Science And Technology | Du T.-T.,China Coal Research Institute | And 5 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

After analyzing series monitoring data of micro-seismic and powered support pressure in Xinjiang, rock-burst mechanism was obtained. Thick and hard roof is main pressure source of rock-burst. Bad and delayed supporting make roof pressure transferred on coal-wall ahead of mining face. Thus, elastic energy and stress concentration formed, and fast mining speed aggravates energy and stress concentration degree. In this instance, rock-burst is inevitable because of strong burst liability of coal-seam. Based on this, rock-burst prevention principle was established that avoiding transferring hard and thick roof pressure to coal-wall. The prevention methods included broken blasting of hard roof, pressure-relief blasting of coal-body and increasing setting load of powered supports. The practice shows that prevention methods are effective. Source


Li H.-D.,Shenhua Group Corporation Ltd | Lan H.,Tiandi Science And Technology | Du T.-T.,Tiandi Science And Technology | Hou D.-J.,Shenhua Xinjiang Energy Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

The cause of a rock-burst in a mining face under hard and thick roof was analyzed and rock-burst prevention principle was put forward on the basis of this. Rock-burst danger period and danger area of the mining face surrounded by 3 gobs was obtained by numerical simulation and geophysical prospecting method. Micro-seismic monitoring data show that breaking height of surrounding rock in rock-burst danger period is higher than that in non-danger period, rock seismic take on a characteristic of high energy and low frequency, and mining speed should be controlled below 3.2 m/d.Roof-broken blasting between powered supports in mining face was adopted to reduce rock-burst danger degree.Electromagnetic radiation and micro-seismic monitoring show that blasting effect is perfect and coal stress ahead of mining face is reduced effectively.Mining safety in rock-burst danger period is ensured. Source


Chen X.-K.,Xian University of Science and Technology | Chen X.-K.,Key Laboratory of Western Mine and Hazard Prevention | Zhu H.-L.,Xian University of Science and Technology | Zhu H.-L.,Key Laboratory of Western Mine and Hazard Prevention | Chen J.-Q.,Shenhua Xinjiang Energy Co.
Journal of Coal Science and Engineering | Year: 2011

Major mineral hazard identifications should consider perilous types of fatal accidents in collieries from its definition, and then set existent hazardous objects and their relevant amount as referenced factors. Eliminating hazards in systems and decreasing risks are their essential purposes with help of hazard identification, risk evaluation and management. By pre-control on major hazards, fatal accidents are avoided, stuffs' safety and healthy are protected, levels of safe management are enhanced, and perpetual systems are built up finally. However, choosing the proper identification and evaluation is a problem all along. Based on specific condition in Jiangou Coal Mine, method of LEC was applied for hazard identification and evaluation in the pre-blasting process within horizontal section top-coal mechanized caving of steep seams. And control measures to of each hazard were put forward. The identification method combining qualitative and quantitative analysis. So, it is practical and operable for the method to develop the given scientific research and has a distinctive impact on high efficiency and safety products for pre-blasting in horizontal section top-coal mechanized caving of steep seams. © 2011 The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg. Source


Lai X.,Xian University of Science and Technology | Zheng J.,Xian University of Science and Technology | Zheng J.,Beijing Huayu Engineering Co. | Jiang X.,Shenhua Xinjiang Energy Co. | And 3 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2016

Surrounding rock of roadway here is deformed easily in fault regions. With coal excavation, concentrated stress formed before working face will cause movement or activation of faults, so that it can lead to a dynamic disaster. In response to the determination of the influential range of dynamic pressure in coal-rock fractured fault zone, taking the specific condition of No.1193 working face in Tunbao mine as the field research object. Combined with hybrid analyses, including mechanism analysis and field measurement, the stress distribution parameter inside the surrounding rock is collected through laying the stress detector and anchor bolt in the rib. It can be concluded that the scope of dynamic pressure within the stope is about 34 m, with the peak dynamic pressure occurring at 5 m before the working face. The assessment of the dynamic pressure can optimize the design of supporting reasonably and ensure the safety of the No.1193 working face in Tunbao colliery. © 2016, China University of Mining and Technology. All right reserved. Source


Lai X.-P.,Xian University of Science and Technology | Lai X.-P.,Key Laboratory of Western Mines and Hazard Prevention | Qi T.,Shenhua Xinjiang Energy Co. | Jiang D.-H.,Shenhua Xinjiang Energy Co. | And 6 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Initially, according to theoretical analysis, investigations of geological environment and mining conditions, the methodology was proposed to monitor multiple indicating upon coal/rock fracture and destabilization. Afterwards, the borehole stress apparatus indicating vertical stress, optical borehole peeper and broken range of top coal instrument, etc. were performed in mining field, the regularity of stress and deformation of top coal were analyzed comprehensively in the process of the segment pre-blasting. Ultimately, the dimension of segment pre-blasting and supporting were confirmed, respectively, to be of 10.0~35.0 m and 0~45.0 m. Source

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