The Effect of Tension-Fractured and Compression-Crushed Zones on Pipe Uplift Resistance in Frozen Soil

摘要

The present paper is a complement and extension of the theoretical pipe uplift theory developed by the authors (Foriero and Ladanyi, 1995). A comparison of the theoretical pipe peak-uplift-resistance with measurements from the Nixon and Hazen (1993) tests is carried out. The present theory shows a good agreement with the measured values of peak resistance and confirms that a gap forms below the pipe as it displaces upward. The theory is, however, limited to deep burial of the pipe, with no ground surface effects. Moreover, at sufficiently high upward displacement rates cracks are produced in the frozen soil. In view of this, a theoretical assessment of tension-fractured and compression-crushed zones above the upward moving pipe reveals an important drop in peak uplift resistance at increasing upward displacement rates.