This technical note presents a method of estimating the yield acceleration based on a logarithmic spiral failure mechanism (field acceleration is defined as the threshold average acceleration acting upon a sliding mass above which permanent deformations occur. It corresponds to a factor of safety with respect to sliding of unity). With the assumption of homogeneity the log spiral allows an analytical solution to be obtained directly. It also possesses the useful property that the unknown reaction on the failure surface, i.e., the resultant of normal and frictional forces, passes through the pole of the spiral. Thus if moments are taken about the pole, only the weight, cohesive moments, and inertia moments need to be considered. Equations which are functions of various aspects of the spiral surface and which can be programmed to automatically find the most critical sliding surface are presented, along with results.

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Filing Info

  • Accession Number: 00196139
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14556 Proceeding
  • Files: TRIS
  • Created Date: Oct 17 1979 12:00AM