复杂环境下深基坑控制爆破

Control over Deep Foundation Blasting under Complex Environmental Condition

目前城镇深基坑爆破作业周边环境条件日趋复杂,不仅周边毗邻大量重要的建(构)筑物,有时在其下方还有轨道交通、地下通道、人防工事等重要设施需要保护。对爆破施工产生有害效应的控制提出了更高的要求,特别是爆破振动和飞石的控制。为此,该文提出在复杂环境下的深基坑爆破采用大孔径台阶爆破逐孔微差起爆的方法,并采取开挖减振槽、加强爆区覆盖等措施,有效控制了爆破有害效应。

At present, the environmental conditions of deep foundation blasting is growing complex. Not only adjacent important buildings, but also rail transit, underground tunnels and civil defense fortification call for protection. So higher requirements for control over harmful effects of blasting construction are put forward, especially control over blasting vibration and flying rocks. Under this situation, large apertured step blasting is presented for deep foundation blasting under complex environmental condition. And excavation damping slot and blasting zone coverage are also adopted to con- trol harmful effects.