雪山隧道贯穿台湾东北部雪山山脉，该隧道由两座主坑及一座导坑所组成，单孔长度逾12.9km，沿线布设三处通风竖井。由于雪山隧道地质复杂多变，加以全断面隧道钻掘机（TBM）开挖进度不如预期，开工后工程进度一直呈落后状态。为了缩短工期，工程单位决定由已开挖完成之二号通风竖井（深度约250m）往水平坑道增辟工作面，藉由联络隧道及斜支坑之贯通，主坑及导坑共增辟10处工作面，总共开挖长度约5 600m，对整体工程进度之提升帮助颇大。从竖井增辟工作面之隧道开挖，其施工安排、出碴作业、通风排水及紧急应变措施等均与一般水平隧道开挖不尽相同，本文将作简要介绍及探讨，以供工程界参考。

The Hsuehshan Tunnel, passing through the northern end of Hsuehshan Range, situates in the northeastern region of Taiwan. This 12.9 km tunnel consists of 2 main tunnels, 1 pilot tunnel and 3 sets of ventilation shafts along the tunnel profile. In the beginning of the construction, tunnel boring machines (TBMs) didn't work well due to the heterogeneous geological conditions, causing the progress of the project lagging behind schedule. To shorten the construction period, the Engineers decided to create additional working faces for the horizontal tunnels through the 250 mdepth ventilation shaft No.2. With the help of the open through of connection tunnels and detour adit, 10 working faces with total length of 5,600 m through the shaft added to the horizontal tunnel excavation, the project progresses had been greatly improved. The construction layouts, mucking operation, ventilation system, drainage arrangement and emergency measurements of working faces through the shaft are so different from the ordinary tunnel excavation. They are introduced in this paper and will be beneficial to the future project of similar characteristics.