American Society of Civil Engineers


Effect of Pile Installation on Static and Dynamic Properties of Soft Clays


by Christopher E. Hunt, S.M.ASCE, (Graduate student, Researcher, Dept. of Civil and Environmental Eng., University of California, Berkeley, California 94720), Juan M. Pestana, M.ASCE, (Asst. Professor, Dept. of Civil and Environmental Eng., University of California, Berkeley, California 94720), Jonathan D. Bray, M.ASCE, (Professor, Dept. of Civil and Environmental Eng., University of California, Berkeley, California 94720), and Michael F. Riemer, A.M.ASCE, (Asst. Adjunct. Professor, Dept. of Civil and Environmental Eng., University of California, Berkeley, California 94720)
Section: Section IV: Ground Improvement Evaluation by In Situ Tests, pp. 199-212, (doi:  http://dx.doi.org/10.1061/40505(285)15)

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Document type: Conference Proceeding Paper
Part of: Innovations and Applications in Geotechnical Site Characterization
Abstract: Static and dynamic soil properties were monitored around a closed-ended steel pipe pile driven in a deep deposit of San Francisco Young Bay Mud. Shear wave velocity measurements were taken prior to pile driving to establish the baseline condition and at selected times after pile driving to document the changes as a function of time. Additional instrumentation and monitoring activities included pore water pressure response and lateral soil deformations as a result of pile driving. A series of conventional laboratory tests were performed on samples collected prior to pile driving and 8 months afterwards. Field measurements after pile driving indicate a significant increase of shear wave velocity as a function of time accompanied by excess pore pressure dissipation. Laboratory tests show a significant increase in the strain to failure with slight increases in undrained strength.


ASCE Subject Headings:
Clays
Monitoring
Pile driving
Soft soils
Soil properties
Tests