Secant Pile Wall Vibrations

[BigHarvey]

I am going to construct a secant pile wall in sand using the cased CFA method (VdW Vor dem Wand in German). I heard about a case history where a damaging level of vibration was observed during the drilling of the secondary piles. Has anabody encountered this situation ? Normally it's a vibration free method. I can only think of a too long waiting time between construction of primary and secondary piles to explain it.