路基、地铁、下水道及其他公用设施的爆破常在人口密集地区和各种建筑物附近进行,使用小孔径的工程建筑爆破日益广泛。工程建筑爆破需要控制破坏范围,即使在开阔地带也是如此。堑沟爆破通常没有自由面,结果破碎岩石除向上和向沟外抛掷外就无处可存。路基爆破则需对震动、飞石和 Blasting of subgrade, subways, sewers and other public facilities is often carried out in densely populated areas and near various buildings, and explosives using small-aperture engineering buildings are increasingly widespread. Engineering construction blasting needs to control the extent of damage, even in open areas. Gutter bursts usually do not have free surfaces, and as a result crushed rocks can nowhere else to go but up and down the ditch. Subgrade blasting is required for vibration, flying stone and