Abstract:

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. 

Key words: shaft excavation  , Labile Wasserglass grouting  , Bentonite Cement grouting