MEASUREMENT OF FOUNDATION STRAINS UNDER LATERAL LOADS

mahyarov · 10-29-2012, 06:14 AM

A cooperative field work effort was developed to evaluate the resistance to lateral loads of poles set in augured holes and surrounded by well graded backfill, and the effect of pole diameter on strength and stiffness. Theoretical aspects of soil-pole interaction, poles in cohesionless soil, and poles in precompressed clay are discussed as well as non-homogeneous soil conditions and theoretical assumptions. Methods of testing are reviewed, and tests in dense sand, glacial till and clayey silt, are detailed. Field test results are discussed, and model tests in sands are described. Design considerations are set forth, and a design example is described. It is concluded from the study that directly embedding poles is, in many cases, an economical method of setting the poles to resist lateral forces. The behavior of directly embedded poles depends on the stress-strain characteristics of the soil surrounding the pole to a distance of approximately 3 pole diameters. The stiffness of glacial till can be reduced by the method of excavating the hole to receive the pole. The study also showed that the stress-strain properties of clays and disturbed glacial till are time dependent; this must be considered in the design.

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