A mixed-use development off the A2070 hit groundwater at 3.2 metres, right where the contractor planned a 7-metre cut for the parking basement. The site sat on the Weald Clay formation, and the initial dewatering attempt triggered settlement in an adjacent Victorian terrace. That job in Ashford taught everyone involved one thing: excavation behaviour is never fully predictable from the borehole logs alone. We were called in to install inclinometer casings in the secant pile wall, surface settlement markers along the pavement, and standpipe piezometers behind the excavation. The deep excavations approach we use in Ashford follows the observational method defined in BS EN 1997-1:2004, where trigger values on displacement and pore pressure dictate when contingency measures activate.
Monitoring turns the observational method from a code requirement into a daily risk-management tool on live Ashford excavations.
