Shenhua Xinjiang Energy Co.

Urunchi, China

Shenhua Xinjiang Energy Co.

Urunchi, China
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Lai X.,Xi'an University of Science and Technology | Zheng J.,Xi'an University of Science and Technology | Zheng J.,Beijing Huayu Engineering Co Ltd | Jiang X.,Shenhua Xinjiang Energy Co Ltd | 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.


Lai X.-P.,Xi'an University of Science and Technology | Lai X.-P.,Key Laboratory of Western Mines and Hazard Prevention | Yang Y.-R.,Xi'an University of Science and Technology | Yang Y.-R.,Key Laboratory of Western Mines and Hazard Prevention | And 7 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

Dynamic hazards being induced by mining stress always threaten safe mining in extremely steep and thick coal seams. Aimed at prevention and control of dynamic hazards in Wudong Coal Mine, Urumchi mine area, we applied a comprehensive methodology including in-situ investigation, theoretical analysis, numerical calculation and field monitoring to reveal mechanism of dynamic hazards being induced by distorted mining stress. The relevant results indicate that mining stress transfer from top of the No. 43 coal seam to sandwiched coal-rock pillar in seams (SCPS), and SCPS deformed largely towards mine-out-area due to self-gravity, which causes tensile stress in its upper position and compressive stress in the bottom. Furthermore, high stress concentration is formed in the roof of the +575 level of No. 45 coal seam, leading to substantial dynamic hazards. With fully considering existing mining scheme, coupled fracturing that we injected water firstly and then blasted rock masses have been put forward and applied as hazard-relieving measures. By means of micro-seismic monitoring and electromagnetic radiation intensity, the frequency of micro-seismic big events decrease to one time per minute from four time per time, and the peak intensity of electromagnetic radiation reduces to about 42.8 mV below the precautious line. Dynamic hazards relief obviously. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.


Lai X.-P.,Xi'an 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.


Lai X.-P.,Xi'an University of Science and Technology | Lai X.-P.,Key Laboratory of Western Mines and Hazard Prevention | Zheng J.-W.,Xi'an University of Science and Technology | Zheng J.-W.,Key Laboratory of Western Mines and Hazard Prevention | And 5 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

With coal excavation, the surrounding rock of roadway in a fault broken zone might induce a dynamic hazard in a coal mine. The determination of internal critical destabilization range plays an important part in supporting parameter optimization and safe excavation. Disturbed zone of roadway at 1193 working face in Tunbao coal district was investigated in this study. In order to control the stability of rock-mass in fault broken zone, engineering geology investigation, theoretical analysis and site monitoring were used to study the range of internal critical destabilization in fault influenced broken zone. It shows that the range could be 2.30 m combined with hybrid consideration including statistical analysis of cracks and internal cracks propagation of surrounding rock with various depths. Different support loadings were given based on different destabilization ranges between roof side and coal seam side. The optimized design of roadway achieved good results in safety and efficient mining. ©, 2015, China Coal Society. All right reserved.


Cui F.,Xi'an University of Science and Technology | Lai X.,Xi'an University of Science and Technology | Chen J.,Shenhua Xinjiang Energy Ltd. | Sun B.,Shenhua Xinjiang Energy Ltd.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

To better achieve fracturing effect in coal and make up for the shortcomings of blasting and water injection, a method of coupled cracking were put forward. The coupled cracking was applied to a steeply dipping and extra-thick coal layer. The caving ability(U) of coal after coupled cracking was forecasted with the method of BP neural network and the differences of U obtained with the different methods were compared. The effect of pressure relief in rock was analyzed with the method of microseismic monitoring. The coupled-cracking technology was found to be an effective to improve the caving ability and to relieve stress concentration for steeply dipping and extra-thick coal layer. The effect of coupled-cracking was evaluated with the analysis process of coupled cracking. The prediction with BP neural network still had a certain degree of reliability for the cross regional of high stage and conventional stage coal mass and the assessment of coupled cracking effect for coal mass was realized. The number of low level microseismic event rose slightly during the water injection and after water injection and blasting, but the energy caused by the decreasing of high level event was more than the energy of new low level event. The released energy after injection water was only 12.5% of the released energy before injection water. The total energy after the ground blasting was reduced by 51% compared with the energy before blasting. Coupled-cracking effect was manifested in the conversion of the small number of microseismic events of high energy into more events of low energy, which reduced the frequency and extent of dynamic disaster and promoted the slow release of high pressure. The coupled-cracking shifted the dynamic disasters to slow static release. ©, 2015, Academia Sinica. All right reserved.


Chen X.-K.,Xi'an University of Science and Technology | Chen X.-K.,Key Laboratory of Western Mine and Hazard Prevention | Zhu H.-L.,Xi'an University of Science and Technology | Zhu H.-L.,Key Laboratory of Western Mine and Hazard Prevention | Chen J.-Q.,Shenhua Xinjiang Energy Ltd Corporation
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.


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.


Li H.-D.,Shenhua Group Co. | Lan H.,Tiandi Science And Technology | Du T.-T.,Tiandi Science And Technology | Hou D.-J.,Shenhua Xinjiang Energy Corporation Ltd.
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.


Zhang H.,LIAONING Technical University | Rong H.,LIAONING Technical University | Chen J.,Shenhua Xinjiang Energy Ltd. | Han J.,LIAONING Technical University | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2015

Geo-dynamic condition evaluation method and index for rockburst were put forward in this paper, and geo-dynamic conditions of Wudong coal mine were judged accordingly. Main influence factors and interaction relationship of rockburst were identified based on geo-dynamic method, and dangerous regions of Wudong coal mine were divided by rock mass stress state analysis system. Critical energy density of rockburst was calculated, and the impact of mining on energy density was determined by numerical calculation method at the same time. At last, dangerous regions of the unmined panels were predicted. Results show that geo-dynamic conditions of rockburst exist both in panel B3+6 at +500 m mining level and panel B1+2 at +475 m mining level; Wudong coal mine is significantly affected by I-1, IV-2, IV-4 and other fractures. The critical energy density of rockburst in Wudong coal mine is 1.29×105 J/m3, and value of energy density would increase by 31.8%-47.1% under the influence of mining. Rockburst will probably occur in high stress and stress gradient region of Wudong coal mine. Prediction work should be strengthened in unmined working face to prevent the occurrence of rockburst. © 2015, China University of Mining and Technology. All right reserved.


Zhang H.-W.,LIAONING Technical University | Rong H.,LIAONING Technical University | Chen J.-Q.,Shenhua Xinjiang Energy Ltd. | Han J.,LIAONING Technical University | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

The main influence factors and interaction relationship of rockburst in Wudong Coal Mine were identified by geo-dynamic method, and the geo-dynamic environment of Wudong Coal Mine was also evaluated. Northern of Bogda Fault zone is strongly compressed. Wudong mining area is located on Bogda Fault system, which is strongly influenced by tectonic activity. The characteristics of fault activities and structure form at Wudong Coal Mine were determined by geo-dynamic method respectively. The primary stress of suberect and extremely thick coal seam was analyzed, the risk assessment method of rockburst based on geo-dynamic division in suberect and extremely thick coal seam had been established, and the rockburst points in southern mining area at Wudong Coal Mine had been found by this method, which mainly occur in high stress area and stress gradient zone. At last, the relationship between mining effect and rockburst was built using FLAC3D numerical method. Subsequently, the areas with rockburst risk were divided and forecasted. Research results show that large strain compression will appear in surrounding rock at Wudong minefield, and high elastic potential energy will be accumulated under the influence of structural stress, which will provide an energy foundation for rockburst. The value of elastic potential energy will increase and will be closer to the critical condition from steady-state to non-steady-state under the action of mining, thus the risk of rockburst will be increased. To avoid the occurrence of rockburst, some monitoring and rescue measures should be taken in advance in two high risk zones. © 2015, China Coal Society. All right reserved.

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