Entirely according to plan, two test dikes collapsed on 26 and 27 August. This was done at the IJkdijk location in the context of the All-In-One Sensor Validation Test.
Construction of the test dikes began in May. The All-In-One experiment does not target a single specific failure mechanism, as with the previous macrostability and piping studies, but multiple and combined failure mechanisms that can occur at a dike.
The time and cause of the dike breaches was therefore not known beforehand. Ultimately both dikes collapsed as a result of the failure mechanism ‘internal overtopping’, where water forces its way into the body of the dike over the clay core. The dike softens and then shifts at the dike toe (at the bottom). The dike collapses at the top and the water flows over it.
Various participants contributed to the experiments to test the predictive value of their sensors (sensor parties). There are also four parties that concentrated specifically on collecting and processing the data yielded by the sensors (data parties).
A lot of hard work will now be done on analysing the data and presenting the preliminary results. This will provide an answer to the question of whether the sensors were able to predict the time, the type of failure mechanism and/or the point of collapse of the test dikes.
A concluding experiment will be carried out at the IJkdijk location in week 36.
You can view the report on the test on RTV Noord (in Dutch)
Read the Tweets about the course of the exciting test
See which sensor and data parties took part in the test.