Hitting unexpected caverns when your TBM is happily boring away!
I've seen this article about a Robbins TBM boring a water tunnel in a geology with limestone and powdery clays in Cassis, France. It hits more than once uncharted caverns hence loosing its grip. Then comes the laboursome task of raising concrete walls for the TBM to get grip. Pro...Tags: Cassis France Robbins, Cassis France Robbins caverns, Galerie des Janots Cassis, Galerie des Janots Cassis Marc Dhiersat
cover tunnel photo by: Matt Brown from London, England / CC BY
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