Field observation and finite element numerical simulation analysis of effect on adjacent piles due to excavation

The pile response to soil movements induced by adjacent excavation has attracted more and more attention of engineers.A field measurement was performed and measurement data shown the deep excavation could produce significant effect on adjacent piles.It was shown that the lateral displacement of DMM wall behind the contiguous retaining piles could be larger than that of contiguous retaining piles with large pile spacing.Great attention should be paid to this phenomenon.Based on the field observation,the influences of various parameters on pile response due to adjacent excavation were studied with three-dimensional finite element model taking into account the distances between diaphragm walls and piles,pile rigidity,vertical load on pile-head and constraint condition of pile-head.Some suggestions for the design and construction were given.