Temperature and Time Effects on the Closure of a Gravel Room in Permafrost.
Bull Assoc Eng Geol 1985 Jan; 22(1):53-65.
Underground excavations in arctic and subarctic regions are subject to significant creep deformation, which are highly temperature and time dependent. The U.S. Army cold regions research and engineering laboratory permafrost tunnel was monitored to investigate these dependencies. The creep behavior of the gravel room was described by a combined exponential and power relationship between closure rate, time factor, and ground temperature. For the long-term stability of an underground opening in frozen ground, the time effect upon the closure rate is secondary to the influence of temperature. The strata separation in the gravel roof of the tunnel opening was also studied. The partings were observed only during periods of high temperature and closure. The results of the study suggest that after consideration of factors such as ground temperature and time dependency, underground chambers in permafrost can be designed and utilized for long-term applications.
IH; Final Contract Report;
Bull. Assoc. Eng. Geol., V. 22, No. 1, Jan. 1985, PP. 53-65.
Univ. of Alaska At Fairbanks