For mining extra-steep-thick coal seam, the sublevel top coal caving is a high efficient method in practical engineering. However, major challenges associated with mining high-section top-coal-caving （HSTCC） are rel...For mining extra-steep-thick coal seam, the sublevel top coal caving is a high efficient method in practical engineering. However, major challenges associated with mining high-section top-coal-caving （HSTCC） are related to the resulting high ground stresses. Inevitability, using the high-section sublevel top coal caving for extra-steep-thick coal seam, the large scale of mined-out area appears. If the prefracture blasting and hydraulic fracture techniques are utilized, the top coal damage and cracks will develop, and the mining complexity will increase, such as seam inclination, continuity, mechanical characteristics of roof and susceptibility of top coal, etc. First, the field conditions of B1＋2 seam were investigated at the ＋588 level of the Weihuliang Underground Mine of China. Subsequently, according to caving mechanism of strata response obtained from several special models including physical simulation tests and numerical simulation models, the prefracture process including blasting and injecting water were analyzed. Then, the prefracture blasting technique was successfully applied to the caving of 52 m-sublevel seam. Finally, the effects were verified by advanced detecting instruments, and the results show these methods and measurements are feasible and valid.展开更多
N^(3+)离子与基态He原子碰撞过程在天体物理、星际空间和实验室等离子体环境中具有重要研究意义.本文采用从头算的多参考单双激发组态相互作用方法精确计算了[NHe]^(3+)碰撞体系的分子结构参数,包括势能曲线和耦合矩阵元等.基于计算得...N^(3+)离子与基态He原子碰撞过程在天体物理、星际空间和实验室等离子体环境中具有重要研究意义.本文采用从头算的多参考单双激发组态相互作用方法精确计算了[NHe]^(3+)碰撞体系的分子结构参数,包括势能曲线和耦合矩阵元等.基于计算得到的结构参数,采用全量子分子轨道强耦合方法开展了低能N^(3+)离子与He原子碰撞电荷转移过程研究,获得了能量在3.16×10^(–3)e V—24 ke V(即2.25×10^(–4)e V/u—1.73 ke V/u)范围内的总单电荷、双电荷转移截面和态选择截面.在计算中考虑了电荷平动因子、高角动量态对碰撞过程的影响,发现高角动量态对电荷转移截面具有显著影响.与现有实验和理论结果相比,当前计算的单电荷和双电荷转移截面与实验测量值更为接近.相较于Liu等(2011 Phys.Rev.A 84042706)未考虑高角动量态的研究,当碰撞能量大于10 e V/u时,其总单电荷转移截面约高出当前计算值2—3倍,表明高角动量态对电荷转移过程具有显著影响.同时研究表明单电荷转移截面远大于双电荷转移截面,在碰撞电荷转移过程中占据主导地位.展开更多
基金Supported by the Natural Science Foundation of China （50375026, 50375028）
文摘For mining extra-steep-thick coal seam, the sublevel top coal caving is a high efficient method in practical engineering. However, major challenges associated with mining high-section top-coal-caving （HSTCC） are related to the resulting high ground stresses. Inevitability, using the high-section sublevel top coal caving for extra-steep-thick coal seam, the large scale of mined-out area appears. If the prefracture blasting and hydraulic fracture techniques are utilized, the top coal damage and cracks will develop, and the mining complexity will increase, such as seam inclination, continuity, mechanical characteristics of roof and susceptibility of top coal, etc. First, the field conditions of B1＋2 seam were investigated at the ＋588 level of the Weihuliang Underground Mine of China. Subsequently, according to caving mechanism of strata response obtained from several special models including physical simulation tests and numerical simulation models, the prefracture process including blasting and injecting water were analyzed. Then, the prefracture blasting technique was successfully applied to the caving of 52 m-sublevel seam. Finally, the effects were verified by advanced detecting instruments, and the results show these methods and measurements are feasible and valid.
文摘N^(3+)离子与基态He原子碰撞过程在天体物理、星际空间和实验室等离子体环境中具有重要研究意义.本文采用从头算的多参考单双激发组态相互作用方法精确计算了[NHe]^(3+)碰撞体系的分子结构参数,包括势能曲线和耦合矩阵元等.基于计算得到的结构参数,采用全量子分子轨道强耦合方法开展了低能N^(3+)离子与He原子碰撞电荷转移过程研究,获得了能量在3.16×10^(–3)e V—24 ke V(即2.25×10^(–4)e V/u—1.73 ke V/u)范围内的总单电荷、双电荷转移截面和态选择截面.在计算中考虑了电荷平动因子、高角动量态对碰撞过程的影响,发现高角动量态对电荷转移截面具有显著影响.与现有实验和理论结果相比,当前计算的单电荷和双电荷转移截面与实验测量值更为接近.相较于Liu等(2011 Phys.Rev.A 84042706)未考虑高角动量态的研究,当碰撞能量大于10 e V/u时,其总单电荷转移截面约高出当前计算值2—3倍,表明高角动量态对电荷转移过程具有显著影响.同时研究表明单电荷转移截面远大于双电荷转移截面,在碰撞电荷转移过程中占据主导地位.
