Experiments with laboratory scale horizontal anchor groups in sand have shown that the capacity, and therefore the efficiency, of an anchor group is influenced by the center-to-center spacings of adjacent anchors and their depths of embedment, the influence decreasing with increasing spacings. It has also been shown that at very close spacings there exists an arching effect that increases the group efficiency. The paper details the testing procedure and the analysis of the results. For the plane strain experiments, the anchors used were two rectangular aluminum plates each 3 in. long, 2 in. high and 1/2 in. thick. The steel pins used to simulate the soil were the same length as the anchors. For tests in sand, the anchors used were circular steel plates each 1/4 in. thick and 1-1/2 in. in diameter. Each anchor was pulled by a smooth 1/4-in. diameter steel rod screwed to the center. Model tests were performed in a sand box with cubic inside dimensions and a length of 39 in. Each anchor rod was connected via an instrumented proving ring to a vertical steel plate with holes drilled into it at appropriate anchor spacings. The steel plate was in turn pulled horizontally by a geared motor at a constant rate of strain of 0.3 in./hr. The loads on the proving ring were measured by digital voltmeter.

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00184869
  • Record Type: Publication
  • Source Agency: ASCE Journal of the Geotechnical Engineering Div
  • Report/Paper Numbers: Tech Note
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM