水压光面爆破在特长隧道开挖中的应用

Application of Water Pressure Smooth Blasting in Excavation of Extra-long Tunnel

在隧道开挖施工中,爆破方案的选择非常重要,相同的围岩,选择不同的爆破方案,将直接影响爆破效果,直接决定隧道施工进度和成本.为了解决敦当高速公路阿尔金山特长隧道施工中存在的爆破超欠挖严重、爆堆和块度不均匀及排烟时间长等问题,在高寒特长公路隧道中采用水压光面爆破技术,不但降低了爆破炸药单耗,缩短隧道掘进循环时间,通过爆破后水袋中的水雾化,可有效降低炮烟和粉尘对人体的危害,有效提高施工效率,降低隧道开挖成本.

In tunnel excavation,the choice of blasting scheme is very important,the same surrounding rock,choose different blasting scheme,will directly affect the blasting effect,directly determine the tunnel construction schedule and cost control.To solve,when existing in highway tunnel construction on rain mountain blasting over break serious,heap and uneven fragmentation and smoke extraction time is long,using hydraulic pressure in the alpine extra-long highway tunnel smooth blasting technology,not only reduce the specific charge blasting,shorten the cycle time of tunneling,through the water in the water spray after blasting,can effectively reduce the gun smoke and dust harm to human body,improve construction efficiency,reduce the cost of tunnel excavation.