Date
11 May 1984, 8:00 am - 10:30 am
Abstract
This paper presents the field behavior of a jetted sand drain installation at a preloaded wastewater treatment facility site in Gloucester, Massachusetts, U.S.A. The site is underlain by surficial estuary deposits above a stratum of stiff to soft clays. Detailed subsurface explorations and laboratory testing program provided data to predict amounts and rates of primary compression and rates of secondary compression in the referenced strata. The field behavior is compared to predictions through analyzed values of total settlement at the end of primary compression, coefficient of consolidation, and coefficient of secondary compression. A field instrumentation program allowed monitoring of settlements of individual strata and piezometric levels within the clay stratum. Delays in beginning construction allowed the preload to remain in place long enough to observe secondary compression of the strata, providing an unusual opportunity for long term collection of field data. Statistical curve fitting techniques were applied to the field settlement and piezometric data allowing the amount of total settlement at the end of primary compression and coefficients of consolidation and secondary compression to be backfigured independently of the laboratory data. The analysis technique, applied to settlements for the first time herein, is applicable to most installations having vertical drains. Analyzed results from field data are compared to predictions based on laboratory data. The results for this site indicate that conventional design methods tend to predict settlements that are slightly large for the clays and slightly small for the organics.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
1st Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1984 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Long, R. P. and Hover, W. H., "Performance of Sand Drains in a Tidal Marsh" (1984). International Conference on Case Histories in Geotechnical Engineering. 36.
https://scholarsmine.mst.edu/icchge/1icchge/1icchge-theme9/36
Performance of Sand Drains in a Tidal Marsh
This paper presents the field behavior of a jetted sand drain installation at a preloaded wastewater treatment facility site in Gloucester, Massachusetts, U.S.A. The site is underlain by surficial estuary deposits above a stratum of stiff to soft clays. Detailed subsurface explorations and laboratory testing program provided data to predict amounts and rates of primary compression and rates of secondary compression in the referenced strata. The field behavior is compared to predictions through analyzed values of total settlement at the end of primary compression, coefficient of consolidation, and coefficient of secondary compression. A field instrumentation program allowed monitoring of settlements of individual strata and piezometric levels within the clay stratum. Delays in beginning construction allowed the preload to remain in place long enough to observe secondary compression of the strata, providing an unusual opportunity for long term collection of field data. Statistical curve fitting techniques were applied to the field settlement and piezometric data allowing the amount of total settlement at the end of primary compression and coefficients of consolidation and secondary compression to be backfigured independently of the laboratory data. The analysis technique, applied to settlements for the first time herein, is applicable to most installations having vertical drains. Analyzed results from field data are compared to predictions based on laboratory data. The results for this site indicate that conventional design methods tend to predict settlements that are slightly large for the clays and slightly small for the organics.
