Analysis of Horizontal Pile Displacement Caused by Pit Excavation

Under the conditions of distribution of a large thickness of weak or unstructured soils, the excavation of the pit leads to the fact that 15–75% of the piles receive excess horizontal deviations of the heads. The results of statistical analysis for 10317 piles, performed in pile fields at sixteen construction sites in the cities of St. Petersburg, Perm and Volgograd, are presented. It is noted that the frequency distribution of the values of deviations of piles in the horizontal plane obeys the normal law. As a result of the analysis, it was revealed that, in general, the amount of pile displacement is influenced by: the time the piles are in the slope, the characteristics of the cut soils and their tendency to softening, the excavation technology. It is proposed to divide the final displacement of the pile into displacements caused by the implementation of new piles, excavation and their presence in the zone of landslide pressure for a long time. The effectiveness of opening the pit with grippers with a capacity of up to 2 m with a change in the direction of movement of equipment is substantiated. Recommendations are given on the design and calculation of grillages, taking into account the possible deviation of pile heads.

R.A. MANGUSHEV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
D.S. KOLESNIK, Postgraduate (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Saint Petersburg State University of Architecture and Civil Engineering (4, Vtoraya Krasnoarmeiskaya Street, Saint Petersburg, 190005, Russian Federation)

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