Calculation models based on monitoring during tunnel construction

摘要

Tunnelling projects are technologically challenging projects. Measurements are performed to control settlements and/or to control the drilling process. However, these measurements can be used for more than just control. This paper shows that analyzing the results of the measurements and modelling with relatively simple calculation models can lead to new insights in the tunnelling process and possible failure mechanism. The construction of bored tunnels started only recently in The Netherlands, in the nineties of the last century. Up to then it was believed that the soft soil in The Netherlands was not suitable for a cost effective construction of bored tunnels. To acquire knowledge on boring tunnels in the soft soil conditions present it was decided to conduct monitoring campaigns on up-coming tunnel projects. The paper describes some measurements that led to a new or better description of processes that occur during tunnelling.