http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Delayed failure of overconsolidated clays under sustained loads
xvii, 267 leaves : illustrations ; 28 cm.
The failure characteristics of overconsolidated clays under
sustained loads less than their peak strengths have been
investigated. Both gradual and sudden types of creep rupture
were observed under various levels of sustained loads. It
was observed that residual strength of overconsolidated clay
does not govern the delayed failure of such clays. Specific
attention was given to sudden failure without any early
indication. A creep threshold has been established above and
below which creep deformation as well as rupture
characteristics vary significantly. A method of determining
this creep threshold from only one test has been developed.
Besides laboratory investigation, load tests on four full-
scale ground anchors were performed and data analyzed. The
variation of anchor capacities during the last six years and
their deformation behavior under various levels of sustained
loads have been reported. It is observed that the capacity
of all four anchors increased 16-43% of their initial
capacities. In terms of lock-off loads, anchors lost 4-13%
of their initial design loads during the last six years. The
overall long-term Performance of the ground anchors at NGES-
TAMU appears to be satisfactory during this period. Based on
these load tests data, it may be concluded that ground
anchors can be built as permanent structures in stiff clays.
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references: pages 164-167.