FIELD INVESTIGATION OF THE INITIAL SETTLEMENTS OF PILE NOT CONNECTED TO THE RAFT IN A COMBINED RAFT-PILE FOUNDATION

Problem statement. The patented useful model for the design of combined raft-pile foundation (CRPF), consisting a raft part and piles, with gap height Δ is made between piles. That is, distribution settlements (resistances) soil base under then piles (after hinged connection raft) assumed, based on condition not exceeding maximum allowable settlement su building or structure. initial which arises from effect additional loading (negative) friction force acting their lateral surface within compressible layer during pressure part, must additionally be taken into account to correct value Δ. purpose article conduct field investigation action forces along in large-scale identify new dependencies generalize them. Conclusions. On basis studies, qualitatively dependence pile deformation ground has been revealed, shows "pile up-slip effect" due excess resistance its manifestation inverse (elastic) deformations pile. investigation, was “effect slipping upwards” negative reverse base, indicates need take this phenomenon when determining projects similar CRPF.