Dynamic tests of pipe pile in saturated peat

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Journal of Geotechnical Engineering; (United States)

DOI:https://doi.org/10.1061/(ASCE)0733-9410(1993)119:10(1550)· OSTI ID:5689624

Crouse, C B; Mitchell, R ^[1]; Kramer, S L ^[2]; Hushmand, B ^[3]

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1. Dames and Moore, Seattle, WA (United States)
2. Univ. of Washington, Seattle, WA (United States). Dept. of Civil Engineering
3. California Inst. of Tech., Pasadena, CA (United States)

Dynamic quick-release and forced-harmonic vibration tests were performed on a steel pipe embedded in soft saturated peat. The translational and rotational pile-head impedances (stiffness and damping values) estimated from the forced-harmonic vibration tests were independent of frequency between 1.8 Hz and 3 Hz, the frequency range of the tests. These impedances were generally similar to those estimated from quick-release tests at initial pile-head offsets similar to the harmonic displacements generated during the forced-vibration tests. However, dynamic translational stiffness was less than the tangent stiffness obtained from earlier static load tests on the pile, a result attributed to cyclic degradation of the peat and possible experimental error. The calibration of simple theoretical models to the dynamic test data also indicated that large reductions in the apparent soil modulus occurred, and that this reduction was greatest near the ground surface where the pile deflections were largest. This observation and the low hysteretic damping indicated by the models suggest that a water-filled gap may have formed between the pile and the peat during the dynamic tests.

• OSTI ID: 5689624
• Journal Information: Journal of Geotechnical Engineering; (United States), Vol. 119:10, Issue 10; ISSN 0733-9410
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
BRIDGES
FOUNDATIONS
MECHANICAL VIBRATIONS
PEAT
ENGINEERING GEOLOGY
CREEP
DYNAMIC LOADS
SHEAR
SHEAR PROPERTIES
SITE CHARACTERIZATION
SOIL MECHANICS
SOIL-STRUCTURE INTERACTIONS
SOILS
STATIC LOADS
WETLANDS
AQUATIC ECOSYSTEMS
ECOSYSTEMS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGY
MATTER
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
MECHANICS
ORGANIC MATTER
SUPPORTS
580000* - Geosciences