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1.
根据老矿山面临资源枯竭的现实,从技术、经济方面分析了开采薄小矿体的可行性。提出了有底柱浅孔留矿法高分段回采的方案,该方案已在易门矿的试验中获得成功,可供有关矿山借鉴。 相似文献
2.
Numerical Simulation of Independent Advance of Ore Breaking in the Non-pillar Sublevel Caving Method 总被引:1,自引:0,他引:1
ZHOU Chuan-bo YAO Ying-kang GUO Liao-wu YIN Xiao-peng FAN Xiao-feng SHANG Ying 《中国矿业大学学报(英文版)》2007,17(2):295-300
The mechanism of stress generation and propagation by detonation loading in five separate independent advance of ore breaking patterns is discussed in the paper. An elastic numerical model was developed using AN- SYS/LS-DYNA 3D Nonlinear Dynamic Finite Element Software. In this package ANSYS is the preprocessor and LS-DYNA is the postprocessor. Numerical models in the paper to actual were l:10 and the element mesh was dissected in scanning mode utilizing the symmetry characteristics of the numerical model. Five different advance rates were studied. Parameters, such as the time required to maximum stress, the action time of the available stress, the maximum velocity of the nodes, the stress penetration time, the magnitude of the stress peak and the time duration for high stress were numerically simulated. The 2.2 m advance appeared optimum from an analysis of the simulation results. The results from numerical simulation have been validated by tests with physical models. 相似文献
3.
Guotao Xiang Qing Xia Su Xu Xiuchong Liu Sha Jiang Yongjie Wang Xianju Zhou Li Li Li Ma Xiaojun Wang Jiahua Zhang 《Journal of the American Ceramic Society》2021,104(6):2711-2720
Design and fabrication of contactless optical thermometer with rapid and accurate performance has become a research hotspot in recent years. Herein, CaSc2O4: Yb3+/Er3+ is employed as the intermediary for temperature sensing under the excitation of 980 nm, which is proven to afford an ultra-sensitive and high-resolution optical thermometry in multiple ways based on the fluorescence intensity ratio (FIR) technology. The optimal thermal sensing behaviors are realized by the FIR of Er3+:2H11/2 → 4I15/2 to 4S3/2 → 4I15/2 transition, which has a relative sensitivity of 1184/T2 and a minimal resolution of 0.03 K along with a maximal absolute error of 0.96 K. Besides that, the FIR between the thermally coupled Stark sublevels of Er3+:4F9/2 manifold (FIRR) as well as that of Er3+: 4I13/2 manifold (FIRN) can also provide excellent optical thermometry. The relative sensitivity of FIRR-based and FIRN-based optical thermometers are calculated to be 402/T2 and 366/T2, respectively, with a same minimal resolution of 0.09 K, which possess the potential to be used for biomedicine due to the inherent advantage of their operating wavelengths located in the biological window. The results demonstrate that CaSc2O4: Yb3+/Er3+ is a promising candidate for temperature sensing with multipath, high sensitivity, and superior resolution. 相似文献
4.
介绍了无底杜分段崩落法的新发展,以及笔者对端部出矿规律,如残留体的形式及作用、出矿方式、矿石损失与贫化的关系等问题的新认识。 相似文献
5.
林景波 《延边大学学报(自然科学版)》2006,32(3):172-175
以能量最低原理、洪特定则和泡利不相容原理为依据,对原子基态的确定问题进行了研究,得到了公式法和图表法两种确定原子基态的方法. 相似文献
6.
阐述了轻型综放支架工作面布置、设备配套等,并通过理论分析和现场试验,优化了开采工艺方法及工艺参数,建立了适合轻型综放开采的工艺模式,获得了较好的技术经济效果,实现了中小煤矿由炮采到综采(综放)的技术跨越. 相似文献
7.
江西铜业集团公司武山铜矿由于进行"5000 t/d"技术改造,导致深部开拓工程量和难度的增大,进度难以提高,直接制约采场转中段的顺利衔接,无法达产。本文针对武山铜矿当前的生产现状及采矿工艺,首次提出了三中段开采方案,进行了一系列试验研究,详细阐述了该方案的特点,为该项工艺的推广使用总结了经验。 相似文献
8.
9.
无底柱分段崩落法回采爆破参数计算机辅助设计 总被引:5,自引:0,他引:5
根据金山店铁矿实际参数与放矿规律,基于无底柱分段崩落法爆破参数优化设计方法,开发了回采爆破参数计算机辅助设计系统。该设计系统可模拟各种采场结构下的爆破参数设计,并将爆破参数与炮孔布置生成在CAD设计图纸上,供设计人员参考和改正,具有效率高的优点。 相似文献
10.
According to the analysis of the mechanism of top coal caving, the caving condition was pointed out, and many factors of caving were also determined. Then the relationship between factors and caving was studied. Based on the above research, one effective method by using field monitoring was brought forward to determine the controlling factor. Then some related key technologies were provided, such as keeping the integrality of the top-coal, raising the horizontal resistance of supports and decreasing the real end-face distance etc.. At last one application of this method was presented, and it was proved to be an effective method. 相似文献