The Factor of “Synergy” in the Design and Construction of Foundations of Driven Piles

Abstract

The existing methods for assessing the bearing capacity of pile foundation from driven piles, are based on calculation schemes that do not fully take into account the factors that affect its joint work with the foundation soil. One of them is the factor of “synergetics” - self-organization of pile-soil system as a change in the physical and mechanical characteristics of the compacted zone the soil massif in the process layout of the pile foundation.It is assume that around the pile driven into the base is formed the symmetric zone of compacted soil. When piling group these zones are deforming in the process of their interaction in the event that the boundaries of the zones are superimposing on each other. The general geometric shape of the compacted soil zone under the base of the pile foundation is also distorted that leads to erroneous conception of the soils bearing capacity. The energy costs of piling indicate availability or lack of interaction of the compacted zones.Experimental tests of the flat profiled driven piles allowed to formulate the basic law of the interaction of compacted soil zones around the piles taking into account the total energy costs of the piles driving. Authors propose a new characteristic – the soil compaction parameter which allows to taking into account intensity of interaction of the compacted soils zones around the piles when designing of pile foundations.Use of the soil compaction parameter at assessing of pile bearing capacity will increase the efficiency of a pile foundation construction and to avoid a probable non-driving of piles.