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PULLOUT TESTS OF GROUTED PILES IN STIFF CLAY

Pullout tests on two grouted pipe piles and three grouted W-piles were performed in a thick layer of stiff clay located five miles to the northeast of Austin, Texas. The pullout tests were conducted to determine the tension capacity of grouted piles and to assess the effect of lateral loading on pullout resistance. The two pipe piles were 16-in. diameter and were encased in grout rings of approximately 4-in. thickness. The grouted embedment lengths were 20 and 28 ft. The three W-piles were 14-in. deep, 12-in. wide, and were encased in grout which formed composite sections of approximately 24-in. diameter. The grouted embedment lengths were 20, 24, and 27 ft. As tension loads were applied to the piles with two manually operated jacks, load and movement measurements at the top of the piles were recorded. Several soil borings were made at the test site. A representative boring log and the results of laboratory soil tests are presented. Test equipment and procedures are described. The test results are presented in the form of load versus movement at the pile top. From these results, maximum average shearing stresses at the pile-grout and grout-soil interfaces were determined. In some of the tests, failures occurred at the pile-grout interface with maximum shearing stresses of approximately 30 psi. In most of the tests, failures occurred at the grout-soil interfaces with shearing stresses of approximately 50 percent of the soil shear strength.

Media Info

  • Features: References;
  • Pagination: p. 539-552

Subject/Index Terms

Filing Info

  • Accession Number: 00138184
  • Record Type: Publication
  • Source Agency: Offshore Technology Conference
  • Report/Paper Numbers: V1, OTC 2473 Proceeding
  • Files: TRIS
  • Created Date: Aug 23 1976 12:00AM