【摘 要】
:
For the purpose to suit the bad mining technical conditions, such as deep imbed, gentle dip angle, and high initial stress in Dongguashan deposit, the stoping s
【机 构】
:
School of Resource and Safety Engineering,School of Civil and Environment Engineering
论文部分内容阅读
For the purpose to suit the bad mining technical conditions, such as deep imbed, gentle dip angle, and high initial stress in Dongguashan deposit, the stoping scheme was optimized. The new mining technique, with temporary curtain walls, large panels and stopes, was achieved as well. The deposit model, which was built through the DATAMINE, was led into FLAC3D for numerical simulation. Based on these, the stabilities of pillars and stopes were analyzed. On the other hand, the impact of output stability by new scheme was verified with the help of optimization planning theory. The results show that stopes and curtain walls are safe when the width of temporary curtain walls between panels are 18 m. The length and width of stope increase to 78 m (82 m) and 18 m respectively, and those of panel increase to 300-500 m and 100 m respectively. The commercial test indicates that the new scheme can attain the aims of simpler production organization, better stope ventilation and work condition, smaller quantities of development and cutting, and 2/3 of equipments as before with the stable output. The pillar stoping technique is credible and valuable.
其他文献
2011年10月28日,由市政府主办、市科技局承办的武汉市首批纯电动公交车上线运营启动仪式在武汉经济开发区三角湖充电站隆重举行。湖北省副省长段轮一、武汉市市委常委冯记春
近年来,国家持续实施扩大内需的政策,交通基础设施建设日益完善,而农村公路建设也取得了很大成就,这为农村客运的发展创造了良好的条件。同时,由于各地经济发展水平不均衡,城
To study the Taiwan Strait (TS), an unusual sea area, the numerical model in marginal seas of China is used to simulate and analyze the tidal wave motion in the
A numerical model, Evolution Equation of Mild-Slope Equation (EEMSE) developed by Hsu et al. (2003), was applied to study the Bragg reflection of water waves ov
2003年至今,浙江省农村公路建设累计完成投资329亿元,完成农村公路建设8.3万公里。从杭州湾到瓯江畔,从东海之滨到西部山区,在浙江10万平方公里的土地上,一条条农村公路通向
Using cetyl-trimethyi-ammonium bromide (CTMAB) as the template agent and tewaethylorthosilicate (TEOS) as the silica source, the MCM-41 mesoporous materials wer
Studies were carried out on several aspects of rare earth elements (REEs), such as the theory and practice of their applications in agriculture, their geochemic
Based on the characteristics of waves, tidal currents, sediment and seabed evolution in the Caofeidian sea area in the Bohai Bay, a 2D sediment mathematical mod
The composition of the oxide film on the surface of Al-Li alloy was measured after accelerated oxidation at 500 and 540 ℃, and the reaction mechanism between C
In this work, we study the coupled cross-flow and in-line vortex-induced vibration (VIV) of a fixedly mounted flexible pipe, which is free to move in cross-flow