| Abstract: | Two pilot projects for bored tunnelling in soft soil have been undertaken in the Netherlands. The monitoring was commissioned under the authority of the Centre for Underground Construction (COB). The research related to the Second Heinenoord Tunnel and the Botlek Rail Tunnel is described. Boring works for the Second Heinenoord Tunnel have been completed, while the boring of the Botlek Rail Tunnel began in spring of 1999. Experience from the first project will be put into use for the development of the latter. Both monitoring schemes have three logical phases: predictions, measuring and evaluation. An overview of all instrumentation and a selection of the results of the Second Heinenoord tunnel is given. |
