SHEET PILE DESIGN WITH VARIABLE SOIL PARAMETERS

A study was made of those parameters which have significant effect on design, and the relative importance of these were determined. The results are presented of a study of the effects of shear strength variations on the design of anchored sheet piles using the Free Earth Support Method. This, it is thought, will give design engineers better knowledge of the effect of such strength parameter variation on the maximum moment, the tie bar force, and the depth of embedment before applying moment reduction factors. A general computer program was developed using the coulomb earth pressure theory. Various options are available in applying the factor of safety such as an application to the shear strength parameters. Representative soil profiles have been studied that cover many of the conditions encountered in practice. They include all granular material behind and below the sheet pile, a multilayered cohesive deposit, and a granular backfill over a cohesive layer. Conclusions formed on the basis of the study are presented. For the typical soil profiles studied, marked variation in maximum bending moment, tie bar force, and depth of embedment of the sheet pile was observed for relatively small changes in shear strength parameters or in the amount of wall friction. Lowering the tie bar depth reduces the maximum bending moment almost proportionally to the change in depth. Surcharge loads increase the maximum moment, the tie bar force, and the depth of embedment in approximately direct proportion to the increase in load. Future research should be directed toward reducing the variables of laboratory results by taking into account sampling, disturbance, laboratory equipment and test standardization so as to reduce the number of errors in the input data. Probabilistic approaches to evaluating the potential range in factor of safety merit serious consideration.

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  • Accession Number: 00262918
  • Record Type: Publication
  • Report/Paper Numbers: Proc. Paper 10363
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM