驮英水库导流泄洪隧洞提前进洞施工方法

Construction method of advance tunneling adopted for diversion and flood discharge tunnel of Tuoying Reservoir

对于开挖方量大、高度超高、坡比陡、地形条件复杂的隧洞洞脸施工,不仅施工难度大且工期长。工期紧张的情况下,若用常规施工方案,势必会影响主洞的施工进度。本文结合驮英水库导流泄洪隧洞施工实践,论述了水工隧洞在施工任务重、工期紧张的情况下,采取提前进洞施工的方法。

The construction of tunnel face is difficult and requires long period due to large quantity of excavation,extra height,steep slope and complex topographical conditions.Normal construction scheme is not able to satisfy tight schedule and even affects the construction progress of tunnel.Combined with the construction practice of the diversion and flood discharge tunnel of Tuoying Reservoir,the authors demonstrate the advance tunneling method adopted to satisty large construction quantities and tight schedule.