Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

Liquefaction remediation solutions often encompass high prevailing costs particularly in heterogeneous soil profiles. Common liquefaction control measures consist of deep foundations, soil mixing, and stone columns. Rammed Aggregate Pier methods have been used in the past two decades to support structures in cohesive and cohesionless soil profiles and control foundation settlements to building tolerances. These methods have recently been adapted to treat liquefiable soil profiles by improving the soil through densification, drainage, and shear stress redistribution. This paper focuses on a case history on Daniel Island, SC where a new variation of RAP methods, called the Rammed Compaction Point™ (RCP) method, was utilized to treat a layer of liquefiable sand that was overlain by a non-liquefiable layer of clay. The paper presents the results of pre- and post-improvement CPT tip resistances and design methods used to calculate liquefaction susceptibility and post-liquefaction settlement. This paper is of particular significance because it shows how a cost-effective treatment method is used to treat difficult soil conditions at liquefiable sites.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Innovative Ground Improvement for Liquefaction Control Near Charleston, South Carolina

Chicago, Illinois

Liquefaction remediation solutions often encompass high prevailing costs particularly in heterogeneous soil profiles. Common liquefaction control measures consist of deep foundations, soil mixing, and stone columns. Rammed Aggregate Pier methods have been used in the past two decades to support structures in cohesive and cohesionless soil profiles and control foundation settlements to building tolerances. These methods have recently been adapted to treat liquefiable soil profiles by improving the soil through densification, drainage, and shear stress redistribution. This paper focuses on a case history on Daniel Island, SC where a new variation of RAP methods, called the Rammed Compaction Point™ (RCP) method, was utilized to treat a layer of liquefiable sand that was overlain by a non-liquefiable layer of clay. The paper presents the results of pre- and post-improvement CPT tip resistances and design methods used to calculate liquefaction susceptibility and post-liquefaction settlement. This paper is of particular significance because it shows how a cost-effective treatment method is used to treat difficult soil conditions at liquefiable sites.