Rammed aggregate pier installation effect on soil properties

David A. Saftner; Junxing Zheng; Russell A. Green; Roman Hryciw; Kord Wissmann

doi:10.1680/jgrim.16.00021

Rammed aggregate pier installation effect on soil properties

David A. Saftner, Junxing Zheng, Russell A. Green, Roman Hryciw, Kord Wissmann

Civil Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

This paper describes the changes in in situ index properties following installation of rammed aggregate piers in a loose sand deposit in New Madrid, Missouri, with a particular focus on the time-dependent strength gain, commonly called sand ageing, as indicated by increased cone penetration test (CPT) tip resistance and dilatometer test (DMT) indices. The method of disturbing the soil and the magnitude of disturbance significantly influence the magnitude of sand-ageing effects. This paper provides the first data on sand ageing following the installation of displacement rammed aggregate piers. In this study, CPT and DMT were performed both immediately before and after the installation of piers. Additionally, CPTs were performed 1 month following the installation of piers. The DMT horizontal stress index increased roughly 100% and the dilatometer modulus increased 200% in a loose clean sand layer immediately following the installation of the piers. The CPT tip resistance increased roughly 100% in this layer immediately following the pier installation and a further 33% in the month following the installation.

Original language	English (US)
Pages (from-to)	63-73
Number of pages	11
Journal	Proceedings of the Institution of Civil Engineers: Ground Improvement
Volume	171
Issue number	2
DOIs	https://doi.org/10.1680/jgrim.16.00021
State	Published - May 1 2018

Bibliographical note

Funding Information:
Support for the research presented herein came in part from the NSF grants CMMI 0530378, CMMI 0900105, CMMI 1300010 and CMMI 1435494. The Geopier Foundation Company coordinated access to the project site and provided the CPT data from 1 month after installation. Pioneer Seeds donated the use of its land and the expertise of its employees. ConeTec Investigations Ltd and the ConeTec Education Foundation are acknowledged for their support to the Geotechnical Engineering Laboratories at the University of Michigan. Mr Jan Pantolin and Dr Yongsub Jung provided valuable assistance conducting in situ testing. This support and assistance are gratefully acknowledged.

Publisher Copyright:
© 2018 ICE Publishing. All rights reserved.

Keywords

Geotechnical engineering
Granular materials
Site investigation

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title = "Rammed aggregate pier installation effect on soil properties",

abstract = "This paper describes the changes in in situ index properties following installation of rammed aggregate piers in a loose sand deposit in New Madrid, Missouri, with a particular focus on the time-dependent strength gain, commonly called sand ageing, as indicated by increased cone penetration test (CPT) tip resistance and dilatometer test (DMT) indices. The method of disturbing the soil and the magnitude of disturbance significantly influence the magnitude of sand-ageing effects. This paper provides the first data on sand ageing following the installation of displacement rammed aggregate piers. In this study, CPT and DMT were performed both immediately before and after the installation of piers. Additionally, CPTs were performed 1 month following the installation of piers. The DMT horizontal stress index increased roughly 100% and the dilatometer modulus increased 200% in a loose clean sand layer immediately following the installation of the piers. The CPT tip resistance increased roughly 100% in this layer immediately following the pier installation and a further 33% in the month following the installation.",

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N2 - This paper describes the changes in in situ index properties following installation of rammed aggregate piers in a loose sand deposit in New Madrid, Missouri, with a particular focus on the time-dependent strength gain, commonly called sand ageing, as indicated by increased cone penetration test (CPT) tip resistance and dilatometer test (DMT) indices. The method of disturbing the soil and the magnitude of disturbance significantly influence the magnitude of sand-ageing effects. This paper provides the first data on sand ageing following the installation of displacement rammed aggregate piers. In this study, CPT and DMT were performed both immediately before and after the installation of piers. Additionally, CPTs were performed 1 month following the installation of piers. The DMT horizontal stress index increased roughly 100% and the dilatometer modulus increased 200% in a loose clean sand layer immediately following the installation of the piers. The CPT tip resistance increased roughly 100% in this layer immediately following the pier installation and a further 33% in the month following the installation.

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Rammed aggregate pier installation effect on soil properties

Abstract

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