In situ strength measurements of weak rocks

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The need to obtain more reliable data arose during investigations for the Arizona superconducting super collider proposal. Estimates of strength for tunnel and cut design obtained from disturbed and reconstituted samples were obviously too low, as were previous estimates from back analysis. Estimates based on refraction seismology, while intuitively sound, involved many assumptions and required validation from field or laboratory strength measurements. This note discusses the application of plate load tests. Because of the high strength of the fanglomerates, large reaction loads were required to induce failure. Interpretation of the results of these tests provides an interesting example of the different failure models needed in rock and soils mechanics as welll as the necessary data to correlate with seismic measurements.

Original languageEnglish (US)
Pages (from-to)1424-1429
Number of pages6
JournalJournal of Geotechnical Engineering
Issue number9
Publication statusPublished - Sep 1991


ASJC Scopus subject areas

  • Engineering(all)

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