Coal and gas outburst is an extremely complex dynamic disaster in coal mine production process which will damage casualties and equipment facilities, and disorder the ventilation system by suddenly ejecting a great am...Coal and gas outburst is an extremely complex dynamic disaster in coal mine production process which will damage casualties and equipment facilities, and disorder the ventilation system by suddenly ejecting a great amount of coal and gas into roadway or working face. This paper analyzed the interaction among the three essential elements of coal and gas outburst dynamic system. A stress-seepage-damage coupling model was established which can be used to simulate the evolution of the dynamical system, and then the size scale of coal and gas outburst dynamical system was investigated. Results show that the dynam- ical system is consisted of three essential elements, coal-gas medium （material basis）, geology dynamic environment （internal motivation） and mining disturbance （external motivation）. On the case of CI 3 coal seam in Panyi Mine, the dynamical system exists in the range of 8-12 m in front of advancing face. The size scale will be larger where there are large geologic structures. This research plays an important guid- ing role for developing measures of coal and gas outburst prediction and prevention.展开更多
Mining induced pressures are strong and overburden failure areas are large in top coal caving longwall mining, which constrains high production and safety mining. By employing the combination of the full view borehole...Mining induced pressures are strong and overburden failure areas are large in top coal caving longwall mining, which constrains high production and safety mining. By employing the combination of the full view borehole photography technique and the seismic CT scanner technique, the deformation and failure of overlying strata of fully mechanized caving face in shallow coal seam were studied and the failure development of overburden was determined. Results show that the full view borehole photography can reveal the characteristics of strata, and the seismic CT scanner can reflect the characteristics of strata between the boreholes. The combined measurement technique can effectively determine the height of fractured and caved zones. The top end of the caved zone in Yangwangou coal mine employing the top coal caving longwall mining was at the depth of 171 m and fractured zone was at the depth of 106-110 m. The results provide a theoretic foundation for controlling the overburden strata in the shallow buried top coal caving panel.展开更多
硅基材料可用于制备高比容量锂离子电池负极,但其在高电压和高温环境下易发生副反应,而通过在电解液中加入功能添加剂,则可有效缓解上述问题。本文通过在电解液中引入硼酸三乙酯(TEB),结果表明可有效改善4.4 V LiNi_(0.6)Co_(0.1)Mn_(0....硅基材料可用于制备高比容量锂离子电池负极,但其在高电压和高温环境下易发生副反应,而通过在电解液中加入功能添加剂,则可有效缓解上述问题。本文通过在电解液中引入硼酸三乙酯(TEB),结果表明可有效改善4.4 V LiNi_(0.6)Co_(0.1)Mn_(0.3)|石墨@SiO软包电池的问题。与无添加剂电解液电池相比,TEB有效抑制了高温存储产气(产气量减少67.1%)和提高循环性能(25℃,从62.33%提升至90.78%)电池的低温放电容量保持率也提升了2.4%(0.5 C)和8.5%(1 C)。由于TEB加入后,可显著提升高电压LiNi_(0.6)Co_(0.1)Mn_(0.3)|石墨@SiO软包电池的宽温域工作能力,表明它是一种具有使用价值的电解液功能添加剂。展开更多
基金funded by the National Natural Science Foundation of China(No.51674132)the State Key Research Development Program of China(No.2016YFC0801407-2)+2 种基金the Open Projects of State Key Laboratory for Geo Mechanics and Deep Underground Engineering of China(No.SKLGDUEK1510)the Open Projects of State Key Laboratory of Coal Resources and Safe Mining of China(No.SKLCRSM15KF04)the Research Fund of State and Local Joint Engineering Laboratory for Gas Drainage&Ground Control of Deep Mines(Henan Polytechnic University)(No.G201602)
文摘Coal and gas outburst is an extremely complex dynamic disaster in coal mine production process which will damage casualties and equipment facilities, and disorder the ventilation system by suddenly ejecting a great amount of coal and gas into roadway or working face. This paper analyzed the interaction among the three essential elements of coal and gas outburst dynamic system. A stress-seepage-damage coupling model was established which can be used to simulate the evolution of the dynamical system, and then the size scale of coal and gas outburst dynamical system was investigated. Results show that the dynam- ical system is consisted of three essential elements, coal-gas medium （material basis）, geology dynamic environment （internal motivation） and mining disturbance （external motivation）. On the case of CI 3 coal seam in Panyi Mine, the dynamical system exists in the range of 8-12 m in front of advancing face. The size scale will be larger where there are large geologic structures. This research plays an important guid- ing role for developing measures of coal and gas outburst prediction and prevention.
基金provided by the National Natural Science Foundation of China(No.51674132)the State Key Research Development Program of China(No.2016YFC0801407-2)+3 种基金the Research Fund of The State Key Laboratory of Coal Resources and Safe Mining,CUMT(No.SKLCRSM15KF04)Natural Science Foundation of Liaoning Province(No.2015020614)Liaoning BaiQianWan Talents Program(No.201575)the Research Fund of State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines(Henan Polytechnic University)(No.G201602)
文摘Mining induced pressures are strong and overburden failure areas are large in top coal caving longwall mining, which constrains high production and safety mining. By employing the combination of the full view borehole photography technique and the seismic CT scanner technique, the deformation and failure of overlying strata of fully mechanized caving face in shallow coal seam were studied and the failure development of overburden was determined. Results show that the full view borehole photography can reveal the characteristics of strata, and the seismic CT scanner can reflect the characteristics of strata between the boreholes. The combined measurement technique can effectively determine the height of fractured and caved zones. The top end of the caved zone in Yangwangou coal mine employing the top coal caving longwall mining was at the depth of 171 m and fractured zone was at the depth of 106-110 m. The results provide a theoretic foundation for controlling the overburden strata in the shallow buried top coal caving panel.
文摘硅基材料可用于制备高比容量锂离子电池负极,但其在高电压和高温环境下易发生副反应,而通过在电解液中加入功能添加剂,则可有效缓解上述问题。本文通过在电解液中引入硼酸三乙酯(TEB),结果表明可有效改善4.4 V LiNi_(0.6)Co_(0.1)Mn_(0.3)|石墨@SiO软包电池的问题。与无添加剂电解液电池相比,TEB有效抑制了高温存储产气(产气量减少67.1%)和提高循环性能(25℃,从62.33%提升至90.78%)电池的低温放电容量保持率也提升了2.4%(0.5 C)和8.5%(1 C)。由于TEB加入后,可显著提升高电压LiNi_(0.6)Co_(0.1)Mn_(0.3)|石墨@SiO软包电池的宽温域工作能力,表明它是一种具有使用价值的电解液功能添加剂。
