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本文介绍了资兴矿务局唐洞煤矿八一井采用控制爆破技术,拆除付井绞车基础,废弃其一部份,保护其另一部份继续使用,取得了很好的效果,为煤矿进行基础改造设计提供了有益的经验 相似文献
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Failure modes of PDC cutters under different loads 总被引:3,自引:0,他引:3
The capability of several types of flat PDC cutters to withstand combined loads were tested and evaluated by the impact and cutting of single PDC cutter on granite in a linear impact-cutting table.The primary failure modes of PDC cutters withstanding different combined loads were investigated and analyzed.The suggestions of enhancing PDC cutters to be suitable for drilling very hard rock have been made. 相似文献
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巷道放顶煤是急倾斜中厚-厚煤层安全、高效开采的一种新方法.应用模糊数学和灰色理论,建立模型确定顶煤初采松动高度,经试验证明是合理的、可行的. 相似文献
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The complete splitting process of steel fiber reinforced concrete (SFRC) at intermediate strain rate was studied by experiment. The basic information of a self-developed SFRC dynamic test system matching with lnstron 1342 materials testing machine was given, and the experiment principle and the loading mode of cubic split specimen were introduced. During the experiment, 30 cubes of 150 mm×150 mm×150 mm and 36 cubes of 100 mm×100 mm×100 mm, designed and prepared according to C20 class SFRC with different volume fractions of steel fiber (0, 1%, 2%, 3%, 4%) were tested and analyzed. At the same time, the size effect of SFRC at intermediate strain rate was investigated. The experimental study indicates that SFRC size effect is not influenced by the loading speed or strain rate. When the steel fiber content increases from 0 to 4%, the splitting strength of SFRC increases from 100% to 261%, i.e. increasing by 161% compared with that of the common concrete. The loading rate increases from 1.33 kN/s to 80.00 kN/s, and the splitting tensile strength increases by 43.55%. 相似文献
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Introduction The sub-level roadway top coal caving is a new method to mining medium-thick and thick seam in the steep seam mines, and technical characteristics of this method are to divide the coal seam into several fields according to certain height(15~25 m) along inclined direction of the seam. A horizontal caving roadway is laid near the roof of the coal seam at the bottom of each sub-level mining field. Small holes for drawing coal are symmetrically laid at the side of the horizontal roadw… 相似文献