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近几年来,光面爆破法(也叫作定界限爆破法)在国外得到了广泛的应用。这种方法既可减少岩石的开凿量,又可获得光滑的巷道表面,大大提高了成巷速度。在开凿地下硐室时,采用这种方法尤为有效。它除了在經常进行破碎的硐室需要用混凝土支护以及个别地方采用杆柱支护外,其他硐室全部不需要支护。 1961年,加拿大在結晶的凝灰岩中,开凿大的机械硐室时(长×寬×高=13.1×8.2×5.5米),曾用过光面爆破法,是分层依次起爆的。第三次爆破时崩落了頂部岩石,并使其高度距設計的拱形輪廓綫有0.6米的距离,余下部分采用光面爆破法。凿岩工作是沿拱形頂板輪廓綫打平行炮孔,炮孔間距0.45米,最小抵抗綫0.6米。使用了高猛度炸药的特制药包,这种药包一头带有开口,装入之后彼此能連在一起。
In recent years, the smooth blasting method (also known as the limit detonation method) has been widely used abroad. This method can reduce the rock excavation, but also get a smooth surface of the roadway, greatly improving the lane speed. This method is particularly effective when digging underground chambers. In addition to its regular crushing chambers need to use concrete support and in some places using pole support, all the other chambers do not need support. In 1961, when large mechanical chambers (length × width × height = 13.1 × 8.2 × 5.5 meters) were excavated in the crystalline tuff in Canada, the smooth blasting method was used to detonate layers in turn. The third blasting avalanches the top rock and leaves it at a height of 0.6 m from the arch of the design, with the remaining part using the smooth blasting method. Drilling work is parallel to the contour of the arched roof blast hole, hole spacing 0.45 meters, the minimum resistance line 0.6 meters. A special medicine bag, which uses high-explosive explosives, has an opening at one end that can be attached to each other after being loaded.