EFFECT OF THE DURATION OF THE "REST" OF A PILE ON ITS LOAD-BEARING CAPACITY

The results of dynamic load testing of piles is presented and it is shown that the settlement of piles, 30 x 30 cm in section and 5-6 m long, after a "rest" of 6-7-11-12 and 18-21 days from one blow of the hammer, was from 6 to 9 mm; it was more than 4.65 mm more than the estimated-control refusal of piles for a 35-t load. Only the dynamic tests of piles 5 m long after a "rest" of 25 days and the piles 6 m long after a "rest" of 15 to 19 days yielded an average settlement from one hammer blow from 2.7 to 4 mm and correspondingly the ultimate resistance of piles determined was from 39.7 to 49.5 t; i.e. it was more than the design resistance of the plan which was 36 t. The results of the twofold dynamic load tests of 5 m long piles are discussed. On the basis of the study it is concluded that corrections must be introduced into the existing standard instructions which will make more specific the duration of the "rest" of piles depending on the character and condition of the soil - its water content, porosity, and consistency. Piles should be driven home after "rest": (a) after not less than 2 days in dry sandy soils; (b) after not less than 3 days in saturated medium-grained and coarse-grained sands; (c) after not less than 20-25 days in saturated fine powdery sands, silty soils, loams, and in plastic clays; (d) after not less than 6 days in dry cohesive clay soils.

  • Supplemental Notes:
    • Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, Vol. 1, No. 4, pp. 10-11, July-August 1964.
  • Corporate Authors:

    Consultants Bureau

    227 West 17th Street
    New York, NY  United States  10011
  • Authors:
    • Zholik, A P
  • Publication Date: 1964-8

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Filing Info

  • Accession Number: 00083794
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 29 1975 12:00AM