关村坝隧道扩建喇叭口工程,是在原既有隧道不中断运营的条件下,对原隧道进行拆除扩建为喇叭口段后过渡到两座单线隧道的扩建工程。必须确保运营与施工安全,施工难度大,属国内首例。本文介绍该工程的控制爆破技术 The project of expanding the bell tunnel of Guan Village dam tunnel is the expansion project of transitioning to two single-track tunnels after the original tunnels are demolished and expanded into the bell mouth section under the condition that the existing existing tunnels are not interrupted. Must ensure that the operation and construction safety, construction difficult, is the first case. This article describes the project’s controlled blasting technology