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Characteristics of fracture development and gas extraction of a lower protected seam
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作者 王海锋 《Journal of Chongqing University》 CAS 2009年第4期239-244,共6页
To ensure the mining safety of working face in the protective seam and meanwhile extract pressure-relief gas of the lower protected seam and eliminate its outburst risk,the present study researched into fracture devel... To ensure the mining safety of working face in the protective seam and meanwhile extract pressure-relief gas of the lower protected seam and eliminate its outburst risk,the present study researched into fracture development of floor coal-rock mass of the protective seam and migration rule of pressure-relief gas from a protected seam so as to obtain an effective pressure- relief gas extraction method.The results show that after the upper protective seam was mined,mining-induced fracturing floor coal-rock mas... 展开更多
关键词 short distance protective seam gas emission penetration borehole gas extraction
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Prevention and control of coalfield fire technology:A case study in the Antaibao Open Pit Mine goaf burning area,China 被引量:10
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作者 Cao Kai Zhong Xiaoxing +3 位作者 Wang Deming Shi Guoqing Wang Yanming Shao Zhenlu 《International Journal of Mining Science and Technology》 SCIE EI 2012年第5期657-663,共7页
It is very difficult to clearly detect the location of a burning area in a coal mine since it is hidden underground.So we conducted research on the distribution of the burning area before controlling it.Firstly,the or... It is very difficult to clearly detect the location of a burning area in a coal mine since it is hidden underground.So we conducted research on the distribution of the burning area before controlling it.Firstly,the original drilling technique was used to analyze and determine the loose and scope of caving of burning area through field test,and then obtained the gases and the temperature data in this area were according to the borehole data.By analyzing these data,we found out that the location of burning area concentrated in the loose and caving area;and finally,the location and development of the burning area within the tested area were accurately determined.Based on this theory,we used the ground penetrating radar(GPR) to find out the loose and caving scale in the burning area during the control process of the burning area,and then located the fire-extinguishing boreholes within target which we used to control burning fire in the section.A mobile comprehensive fire prevention and extinguishing system based on the three-phase foam fire prevention and control technique was then adopted and conducted in the burning area which took only 9 months to extinguish the 227,000 m 2 of burning area of 9# coal.This control technology and experience will provide a very important reference to the control of other coalfield fire and hillock fire in the future. 展开更多
关键词 Coalfield fire Ground penetrating radar(GPR) boreholes Three-phase foam
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Comment on “A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation”
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作者 Steve A.Horne Douglas Miller CanYun Wang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第8期89-90,共2页
In the paper"A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation"by Liu et al.[1]numerical experiments are reported for a dipole sonic l... In the paper"A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation"by Liu et al.[1]numerical experiments are reported for a dipole sonic logging scenario with a deviated borehole penetrating a VTI anisotropic medium.In such a situation it is important to clearly define the meaning of group and phase velocities as this has led to much confusion in the literature as discussed by Miller,Horne and Walsh[2]. 展开更多
关键词 penetrating Comment on isotropic borehole logging sonic confusion dipole deviation clearly
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Reply to “Comment on ‘A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation' ”
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作者 Chang Su XiuMei Zhang +2 位作者 WeiJun Lin HaiLan Zhang XiuMing Wang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第8期91-92,共2页
We appreciate the comment from Horne,Miller and Wang on the paper‘A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation’by Liu et al.(2015)[1],f... We appreciate the comment from Horne,Miller and Wang on the paper‘A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation’by Liu et al.(2015)[1],for the opportunity to consider and clarify the group and phase velocity issue in sonic logging with a deviated borehole penetrating a VTI formation.We re-read the paper by Liu et al.[1]and did some numerical tests and analyses. 展开更多
关键词 penetrating Comment on Reply to isotropic borehole sonic opportunity logging comment appreciate
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