Sensitive strata in Bootlegger Cove Formation

Journal of Geotechnical Engineering



Sensitivity magnitudes are interpreted from remolded strength values in recent subsurface geologic, geotechnical, and geochemical data from the Bootlegger Cove Formation adjacent to the Turnagain Heights Landslide. The results show that strata composed of highly sensitive clays occur in both the middle and lower zones of the formation, and that between these strata the clays are generally of low-to-medium sensitivity. The most sensitive stratum is in the middle zone between two sand layers, and its sensitivity increases from both clay-sand interfaces to a maximum at the center of the stratum. The pore fluid chemistry of the highly sensitive materials differs from that in the materials of low to medium sensitivity only in their concentrations of organic carbon, chloride, bicarbonate, and sulfate. The total dissolved solids concentration is low, and the ratio of monovalent to divalent cations is very high throughout the middle and lower zones of the formation. Of the known causes of high and extremely high sensitivities, only organic and/or anionic dispersants are consistent with these findings.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Sensitive strata in Bootlegger Cove Formation
Series title Journal of Geotechnical Engineering
DOI 10.1061/(ASCE)0733-9410(1989)115:9(1239)
Volume 115
Issue 9
Year Published 1989
Language English
Publisher ASCE
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Geotechnical Engineering
First page 1239
Last page 1251
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