Great to have accompanied SUBTERRA during the successful completion of a complex double DN1400 microtunnel in Portet-sur-Garonne, southwestern France, linking local water treatment facilities. Site conditions, in a dense urban environment, required both tunnels to begin from one central entry pit, tunnelling first west (for 101 metres) then east (for 172 metres) under the busy RD120.
The extremely varied geological formations encountered (clay, gravel, stony soil) called for the highest levels of care; OPTIMUM engineers accompanied SUBTERRA throughout the works to continuously monitor the tunnelling parameters and geotechnical conditions. This allowed any discrepancies to be identified quickly and ensured that corrective measures were put in place straight away.
Congratulations to all involved for their commitment and teamwork.
