Within the construction of the A-40 highway from Lyon to Geneva, a 3230 M long reconnaissance gallery has been excavated for the Chamoise Tunnel. The works lasted from January 1979 to October 1980. Several measurements of swelling have been made as well in situ as in laboratory, on the lower Oxfordian marls. These marls containing nodules and pyritous fossils were met on 200 M. The same measurements were also performed on the middle Oxfordian Effingen and Geissberg banks marls that were met on 550 M. In the first section, the authors proceed to a critical analysis of the method proposed by Huder and Amberg. This method leads to important errors on the estimation of the swelling pressure under steady volume if the test duration of each swelling step is too short. On another hand, the uncertainty of the approach of the swelling pressure is the greater as the saturation stress of the sample is the further from the swelling pressure. The error made is important in the case study where the swelling pressure may reach as much as 8 mpa. In the second section, the authors recommend a new laboratory method that allows the direct measurement of the swelling pressure under a steady volume as well as its variation during time in function of the volume increase permissible for the sample. The influence of the geometric characteristics of the samples is also analysed as well. The authors propose an hyperbolic law to translate the evolution of the swelling process according to the duration of each strees step. (Author/TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 327-333
  • Serial:
    • Issue Number: 84/3

Subject/Index Terms

Filing Info

  • Accession Number: 00389713
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0-85825-219-8
  • Files: ITRD, TRIS, ATRI
  • Created Date: Mar 29 1985 12:00AM