During the initial excavation, the tender coal seam workings in deep seam in Nantun Colliery takes on slocking of roof, with breaking-out in bulk coal and surrounding rock failure.
南屯煤矿深部松软煤层巷道，在掘进过程中顶板破碎，伴有大量顶煤冒落且围岩破坏严重。
The seam averages more than 50 meters wide - one of the world's thickest - and 250 meters deep, though portions of it go down at least 600 meters.
平均煤层宽度大于50米——世界上最厚之一——并且有250米深，尽管其中部分可能至少在600米之下。
Others aspire downwards deep in the St. Regis canoe Area, floating in a seam of light, a silent wake trailing behind their canoe.
另外一种“立志向下”是在圣·里吉斯独木舟区域，漂浮在一叶扁舟上，留下默默尾流。
We are puzzled by the pervious to water, the underground coal seam fire prevention, the question of deep zone mining and coal mining from incidence in Jixi.
透水、地下煤层防灭火、深部开采问题、大倾角采煤已经成为困扰鸡西煤炭开采的技术问题。
At the present, the problem which is urgently to be solved in gas discharge is the drilling technology in soft coal seam gas discharge, especially the drilling technology of the deep hole.
目前在瓦斯抽放中急待解决的问题是软煤层瓦斯抽放的打钻技术，尤其是深孔打钻技术。
Along with the mines toward deep level in China, the problems of soft rock are becoming more and more outstanding, especially controlling surrounding rock of three-soft coal seam.
随着我国煤矿开采越来越趋向深部，煤矿软岩问题便越来越突出，特别是三软煤层回采巷道的围岩控制问题。
Combining with the production data, grey GM (1, 1) model is used to predict deep thickness of coal seam in Moxinpo.
利用灰色GM(1,1)模型，结合生产资料对磨心坡深部煤层厚度进行预测。
Little splash deep bath beautiful welding seam.
飞溅小，熔池深，焊接效果好。
Little splash deep bath beautiful welding seam.
飞溅小，熔池深，焊接效果好。
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