The Second Heinenoord tunnel; the main monitoring results

摘要

During the construction of the Second Heinenoord tunnel, the first large diameter bored tunnel in the Netherlands, an extensive monitoring program was executed to gain knowledge and experience about bored tunnels in soft soil. In this paper the mainresults will be described. Conclusions are drawn with respect to bore technology; borefront stability and influence of boring and grouting on surface settlements. Furthermore the design of the tunnel lining is discussed, given the staged construction ofthe lining and thrust forces during boring.