地下水影响竖井开挖工作甚巨，竖井开挖成败除了地质因素外，有效之止水灌浆工作亦为主要关键。雪山隧道竖井地址岩体破碎，地下水丰沛，3#竖井开工初期止水灌浆成效不如预期，致开挖工率远低于预定进度，经检讨评估后，排气井采水玻璃灌浆工法（Labile Wasserglass grouting）、进气井GL：-157.60以下采皂土水泥灌浆工法（Bentonite Cement grouting）降低开挖面侧壁之渗水量，辅以强制抽排水系统，得以顺利开挖。鉴于3#竖井皂土水泥灌浆成效良好，1#竖井止水亦采用皂土水泥灌浆工法，由实际开挖过程验证，皂土水泥灌浆工法可有效降低开挖面侧壁渗水量。针对水玻璃灌浆工法（Labile Wasserglass grouting）及皂土水泥灌浆工法（Bentonite Cement grouting）之成效，比较不同灌浆工法对竖井开挖工率之影响程度，期供后续竖井工程选择止水灌浆工法之参考。

The effective performance of grouting is an important keypoint for a successful shaft excavation. The rock condition of the ventilation shafts in Hsueshan tunnel are fractured and highly permeable with large amount of groundwater. In shaft No.3 , the performance of Bentonite Cement grouting in the intakeair shft is more efficient than Labile Wasserglass grouting in the exhausteair shaft .Thus in shaft No.1 , Bentonite Cement grouting was proceeded through the whole shaft before excavation. As a matter of fact , the excavation of shaft No.1 makes extremely excellent progress.