Created a new damage model for explosive for LS-DYNA3D,taking advantageof the Taylor method aimed at the high gassy and low permeability coal seam,and numericallysimulated and analyzed the deep-hole presplitting explo...Created a new damage model for explosive for LS-DYNA3D,taking advantageof the Taylor method aimed at the high gassy and low permeability coal seam,and numericallysimulated and analyzed the deep-hole presplitting explosion.The entire processof explosion was represented,including cracks caused by dynamic pressure,transmissionand vibration superposition of stress waves,as well as cracks growth driven by gas generatedby explosion.The influence of the cracks generated in the process of explosion andthe performance of improving permeability caused by the difference of interval between.explosive holes were analyzed.A reasonable interval between explosive holes of deepholepresplitting explosions in high gassy and low permeability coal seams was proposed,and the resolution of gas drainage in high gassy and low permeability coal seam was putforward.展开更多
为确定液态CO2相变致裂爆破影响半径,进而确定合理的装药量和布孔参数,需要研究液态CO2相变致裂的TNT当量。通过分析液态CO2相变致裂原理,选取压缩气体与水蒸气容器爆破模型进行TNT当量计算,然后利用动力分析软件ANSYS_LS-DYNA3D模拟TN...为确定液态CO2相变致裂爆破影响半径,进而确定合理的装药量和布孔参数,需要研究液态CO2相变致裂的TNT当量。通过分析液态CO2相变致裂原理,选取压缩气体与水蒸气容器爆破模型进行TNT当量计算,然后利用动力分析软件ANSYS_LS-DYNA3D模拟TNT在混凝土试块中的爆炸,分析应力分布情况,并将所得结果与液态CO2相变致裂试验结果对比。研究结果表明:液态CO2相变致裂设备中,F57L型储液管和SD390型定压泄能片单次致裂产生的能量与277 g TNT所具有的能量相当;液态CO2相变致裂试验的破碎分形维数D为2.83,TNT数值模拟的破碎分形维数D为2.41,相对误差约为14.84%,满足工程应用的需要。展开更多
基金Supported by the National Science Foundation of China(50534090,2007BAK28B01,2007BAK29B06)the Science Foundation of Anhui Province(050440403)Creative Team Plan for High School of Anhui(2006KJ005TD)
文摘Created a new damage model for explosive for LS-DYNA3D,taking advantageof the Taylor method aimed at the high gassy and low permeability coal seam,and numericallysimulated and analyzed the deep-hole presplitting explosion.The entire processof explosion was represented,including cracks caused by dynamic pressure,transmissionand vibration superposition of stress waves,as well as cracks growth driven by gas generatedby explosion.The influence of the cracks generated in the process of explosion andthe performance of improving permeability caused by the difference of interval between.explosive holes were analyzed.A reasonable interval between explosive holes of deepholepresplitting explosions in high gassy and low permeability coal seams was proposed,and the resolution of gas drainage in high gassy and low permeability coal seam was putforward.
文摘为确定液态CO2相变致裂爆破影响半径,进而确定合理的装药量和布孔参数,需要研究液态CO2相变致裂的TNT当量。通过分析液态CO2相变致裂原理,选取压缩气体与水蒸气容器爆破模型进行TNT当量计算,然后利用动力分析软件ANSYS_LS-DYNA3D模拟TNT在混凝土试块中的爆炸,分析应力分布情况,并将所得结果与液态CO2相变致裂试验结果对比。研究结果表明:液态CO2相变致裂设备中,F57L型储液管和SD390型定压泄能片单次致裂产生的能量与277 g TNT所具有的能量相当;液态CO2相变致裂试验的破碎分形维数D为2.83,TNT数值模拟的破碎分形维数D为2.41,相对误差约为14.84%,满足工程应用的需要。
