Presents the method of supporting soft rock drifts by releasing pressure with a guided roadway.
介绍了导巷卸压支护软岩巷道的方法.
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极软岩巷道具有持续塑性变形破坏工程特征,单一支护方式难以控制.
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There are forest, spinney , open woodland, plough field, grass and rock around the Great Wall.
长城周围的土地利用类型主要有有林地, 灌木林, 疏林地, 耕地, 荒草地和裸岩.
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" Is that stile a rock. You couldn't make it wobble if you tried. "
“ 那座台阶牢靠吗?” “ 坚如磐石,如果你推一下试试,不会让它动荡一下的. ”
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岩层产状可以通过定向仪器 、 数学计算或赤平投影求解.
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Stealthy wire can be attached to branch, across a rock or by a watering hole.
隐蔽的导线可粘在树枝上, 穿过石头或.
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如钻岩机 、 路面破碎机 、 铆钉枪 、 锻压机、喷漆器、喷抛清理机和喷雾器等.
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Soundness of the rock surface must be included in the topographic study.
岩石表面的坚固性,必须包括在地形研究之内.
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