IN SITU CREEP ANALYSIS OF ROOM IN FROZEN SOIL

In a closure of the discussion of this paper, the authors explain how constant stress was maintained during creep tests. The apparatus used was a cam (illustrated) which serves as a variable length lever arm which increases the load on the soil specimen as it deforms, thus maintaining a constant average stress. Details are given of the use of the cam. The shape of the cam was designed on the assumption that: (1) each specimen remains a right cylinder; (2) the volume of each specimen remains constant; and (3) the initial length of each specimen is 6 in. A log-log plot of test data is shown which was obtained from unconfined compression creep tests and the agreement between the computed and observed in situ deformations is shown (in figures) as experimental evidence that the selection of log-log representation of this high ice content undisturbed soil is reasonable. Difficulties in choosing a constitutive equation for frozen soil is traced to the variety of shapes of the creep curves. The method suggested for predicting the deformation of frozen soil in the design of a complex structure is to perform creep tests on the soil from the construction site, and from there test determine a reasonable constitutive theory. With this expression, one may then employ the finite element method or another method of analysis for the design of the structure. Within the time interval considered, and under the stress conditions encountered, a power relationship for steady-state creep appears to be an excellent representation of the behavior of the particular soil under consideration, whether in situ or in a laboratory environment.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Thompson, E G
  • Sayles, F H
• Publication Date: 1972-2

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 179-81
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 100
  • Issue Number: GT2
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Analysis; Behavior; Calculation; Construction sites; Creep; Deformation; Field tests; Finite element method; Frost susceptibility; Graphics; Ice; Icing; Laboratory tests; Soils; Standardization; Stresses
• Uncontrolled Terms: Computation; Unconfined compression
• Old TRIS Terms: Frost effects; Graphic methods; Insitu methods; Stress conditions
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00262926
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 12 1974 12:00AM