A PRACTICAL GUIDE TO THE DERIVATION OF UNDRAINED SHEAR STRENGTH FROM PRESSUREMETER TESTS

This paper reviews the techniques used to derive undrained shear strengths from pressuremeter tests in clays, together with corrections to allow for the length and shape of the instrument's expanding section. It proposes a practical method for obtaining consistent values of strength, thus permitting a true assessment of natural variations in strength. To obtain consistent results from pressuremeter tests which represent ground conditions, a standard procedure must be used. Several specifications exist for such a procedure, and they can be classified into the following groups: (1) the Menard stress-controlled method; (2) the self-boring pressuremeter (SBP) and prebored pressuremeter (PBP) strain-controlled tests; and (3) the push-in pressuremeter (PIP) strain-controlled tests. The two methods used most often to interpret pressuremeter data are the empirical method, based on a modified limit pressure (SBP and PBP), and a theoretical method, based on cavity expansion theory. There are several mathematical models for either the soil or the pressuremeter curve, and the simple perfectly plastic model for the loading curve gives a strength representing the average of the integrated curve. Several recommended practices are outlined. For the covering abstract see IRRD 883023.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 559-70

Subject/Index Terms

Filing Info

  • Accession Number: 00729288
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2513-0
  • Files: ITRD
  • Created Date: Dec 12 1996 12:00AM