In order to understand very well on mechanical effects of debris with high velocity impacting a defensive gate, numerical simulation became an important mean.
文中用流体弹塑性模型数值模拟了高速碎块撞击防护门的效应；详细描述了碎块撞击防护门复杂物理过程；分析了碎块参数对撞击效应的影
The paper introduces the hole-by-hole technique aiming at reducing blasting vibration and the size of rock broken,analyzes its mechanism,igniting mod,network design and the determination method of sound millisecond delay interval.
文中介绍了以降低爆破振动和破碎块度为目的的逐孔起爆技术,分析了逐孔起爆机理、起爆方式、网络设计及合理微差间隔时间的确定方法,并将该技术应用于露天矿山台阶爆破中,取得了预期的效果。
By means of controlling appropriate interval of firing time between holes and holerows and adopting high-precision detonator,the shape of muckpile and the size of rock broken can be controlled effectively,thus achieving high quality of blasting and decrement of mining cost.
通过研究不同岩性的合理孔间及排间微差间隔时间 ,并利用高精度雷管逐孔起爆新技术 ,可有效地控制爆堆形状和破碎块度 ,改善爆破质量 ,降低采矿总体成本。
According to situations,floated hold-up method,hold-fetch method,or vitrectomy combined with Rotated-Chipping phacoemulsification were performed.
方法 外伤性晶状体脱位及超声乳化手术中晶状体核碎块落入玻璃体腔共 17例 ( 17眼 ) ,采取适当措施灵活运用浮动托出法、利用眼内器械后段玻璃体托取法或后段玻璃体切除联合超声乳化“削梨”吸出法等不同手术技巧和方法进行处理。
Damage effect on top plate of layered structure under impact of falling mass from blast layer;
遮弹层震塌碎块对成层式结构顶板的冲击破坏效应
Drilling in breakstone or pebble,We should not run after drilling depth blindly,And we can not ust the old casing pipe and the new casing pipe in the same time when we drill in deep drill hole,we must strictly control to drill slanting.
在碎块石、漂卵石地层中钻探,不可盲目追求钻孔进尺,且深孔钻探时新旧套管不宜混用,要严格控制钻孔偏斜。