A semi-empirical method for stability analysis was developed from records of test trenches at three different locations in the Oslo area. It was considered adequate to base the calculations on simple assumptions regarding the mode of failure and limitations of the body taking part in sliding. Failure is considered to develop by a vertical movement of the upper block at the same time as the lower block moves horizontally towards the slurry trench. The assumptions that were made compensate for the presence of open cracks in the weathered crust, the vane estimation of strength in the underlying weathered clay, the fact that the assumed failure body does not correspond to the most critical one, and the probability of a tendency to progressive failure due to earlier strength mobilization along the inclined planes than along the vertical ones. The proposed method gives reliable results for slurry trenches of normal life- time. In all cases where calculations indicated stable conditions, no failure did occur. In the cases of rapidly loading a trench to failure, the proposed method gave safety factors less than unity, thus leading to a safe design.

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  • Corporate Authors:

    Norwegian Geotechnical Institute

    P.O. Box 40 Tasen
    Oslo 8,   Norway 
  • Authors:
    • AAS, G
  • Publication Date: 0

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  • Accession Number: 00144311
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 15 1977 12:00AM