城市超浅埋隧道微振爆破技术

Micro-vibration Blasting Technology for Urban Shallow-buried Tunnel

重庆市轨道交通一号线区间及车站工程沿线的管线密集,地表高大建筑物多,最小围岩厚度仅4.0m左右,属超浅埋隧道,对振速控制要求极高,按常规微振钻爆法施工,无法满足地面建(构)筑物的安全要求,严重影响工程进度,甚至造成社会不稳定因素。采用电子雷管,使用数码智能精确控制爆破技术,与常规微振钻爆法相比降振可达70%,大大提高了建(构)筑物的安全性,加快了施工进度,化解了社会矛盾,取得了显著的社会效益和经济效益。

There are numerous pipelines and tall buildings along the line one and at these stations of rail transit in Chongqing with the minimum thick-ness of surrounding rock only about 4.0m, which suggests it is a shallow-buried tunnel, calling for high vibration velocity control requirements. The con-ventional micro-vibration blasting method cannot meet building security requirement, slow down construction process and even trigger social instability. Electronic detonator and smart intelligence are adopted to precisely control blasting technology with vibration reduction of 70%compared with conven-tional blasting method, thus building security can be greatly raised and construction process is sped up and obvious social and economic benefits.