共查询到20条相似文献,搜索用时 15 毫秒
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孕镶金刚石钻头在新集矿区坚硬岩层钻进中的应用 总被引:1,自引:0,他引:1
介绍金刚石孕镶钻头的结构特点以及其在新集一矿、二矿、三矿使用情况 ,成功、快捷的穿过了坚硬致密的花岗片面麻岩和石英砂岩 ,充分发挥了金刚石钻头的科技优势 相似文献
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磨料射流联合机械齿提高硬岩钻进效率研究 总被引:1,自引:0,他引:1
针对煤矿中穿硬质岩层钻孔预抽瓦斯时钻进困难这一问题,在理论分析孔底“凸台”的形成是导致传统旋转钻头钻进困难主要原因基础上,提出了磨料射流联合机械齿钻进硬岩新方法,即利用磨料射流强大的冲蚀能力,预先消除“凸台”,形成先导孔,进而改变传统旋转钻头钻岩机理,达到提高硬岩钻进效率目的。利用断裂力学理论与能量守恒原理揭示了磨料射流联合机械齿提高硬岩钻进效率机理。设计发明了一种破碎硬岩钻头,总成了一套联合钻进硬岩实验系统,并完成了一系列新技术与现有技术的对比实验研究。结果表明,相同条件下,钻头钻进效率较现有技术条件提高63%,承受轴向力与扭矩分别下降约15%和20%,钻头磨损明显减轻。 相似文献
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针对水-岩作用中的不确定性现象,运用随机分析的方法对水-岩作用状况进行分析。通过本次研究的化学平衡计算与Monte—Carlo耦合程序,对某坝基两处水-岩作用状况进行了分析评价。结果表明:可信度分析在水-岩作用水文地球化学模拟中有很好的实用性和应用前景,水化学数据的不确定性对分析结果的均值和方差影响较大,而对评价水-岩状态可信度概率的影响相对较小。 相似文献
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The mechanism of interaction between the edges of discontinuities under the normal loading is proposed based on the elastic-brittle
model of a rock mass. The respective constitutive relationships are synthesized by numerical experiments, and the functional
dependence of an average normal rigidity of a joint on the fractal dimension of its edge is established.
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 3–13, September–October, 2008. 相似文献
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Large-scale bed separation in bending strip upside cranny strip was brought by un-consistency of overlying strata subsidence movement due to under surface mining. Different characteristic of movement and deformation of overlying strata and surface include periodic caving of bed separation interspaced along with work face mining. Conglomerate rock layer movement is the main power fountain of rock burst on the basis of locale observation. And rock burst moves periodically adapted to movement of deep conglomerate rock layer which had similar characteristic with main roof. Practice indicates this method that forecasting and prediction using correlation information of movement of strata and surface is feasible and has reference meaning for similar stope. 相似文献
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