A relative-stability analysis of land intended for development is necessary to identify areas of unstable or potentially unstable ground, and to differentiate them from adjacent areas of stable ground. The purpose of such an analysis is to convey information on ground stability to planners, engineers, and other concerned professionals who desire to put the land to its best possible use. The method of relative-stability analysis presented here requires initial preparation of a detailed engineering geologic map that delineates rock and soil units, as well as pertinent structural features such as faults, landslides, and bedding orientations. A relative-stability map is then derived, by the same geologist(s), from the engineering geologic map. Our relative-stability maps identify stable and unstable areas in descriptive terms that are meaningful to planners, engineers, and others who are not professional geologists. Three broad units - stable, unstable, and potentially unstable areas - can be subdivided into more specific categories based on local geologic conditions and the various sources of instability. Examples of these categories are: potential ground rupture within zone of active fault, expansive soil, active deep or shallow landslide, potential deep or shallow landslide, stable bedrock. The expected engineering behaviour of the materials representing each category is briefly outlined in the explanation for the relative-stability map. By employing specific classifications of this type we intend to convey enough information to serve as a base for preliminary land-use and engineering decisions. In this paper the method of relative-stability analysis is illustrated by examples from three areas in the San Francisco Bay region of California. /Author/TRRL/

  • Availability:
  • Corporate Authors:


    Radarweg 29
    Amsterdam,   Netherlands  1043 NX
  • Authors:
    • Hoexter, D F
    • Holzhausen, G
    • Soto, A E
  • Publication Date: 1978-12

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 319-3367
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00193961
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: May 26 1979 12:00AM