Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

As part of the $1.7 Billion I-15 CORE highway reconstruction project in Utah, several new or enlarged large embankments were constructed adjacent to existing buried utilities. Lightweight fill was selected as the technology to limit distress to the adjacent utilities. In order to estimate the impact from new construction to the utilities, settlement estimates for the lightweight embankment were performed using traditional settlement estimating techniques. Numerical models using FLAC3D were then performed to refined estimates. Estimates of lightweight embankment foundation settlements from this construction were obtained from the finite difference modeling. Three-dimensional numerical modeling was used in order to evaluate the foundation settlements since numerical modeling can better estimate the induced stresses and deformations of subsurface soils for complicated geometry, loading history, and for locations outside of the loaded area. During and after construction of the embankments, foundation soil settlement was measured for the lightweight embankments. Settlement estimates from traditional engineering methods and the FLAC3D analyses were compared to the observed settlement data. Sensitive buried utilities were successfully protected by use of lightweight fills, and engineering settlement estimates were shown to agree well with measured settlement data. This case history shows how urban highway re-construction on soft soils, which will likely become more common in the future, can be designed and constructed to reliably protect existing structures.

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

Settlement of Large Embankment Construction Adjacent to a Buried Gas Pipeline — A Case History in Settlement Mitigation Using Lightweight Fill

Chicago, Illinois

As part of the $1.7 Billion I-15 CORE highway reconstruction project in Utah, several new or enlarged large embankments were constructed adjacent to existing buried utilities. Lightweight fill was selected as the technology to limit distress to the adjacent utilities. In order to estimate the impact from new construction to the utilities, settlement estimates for the lightweight embankment were performed using traditional settlement estimating techniques. Numerical models using FLAC3D were then performed to refined estimates. Estimates of lightweight embankment foundation settlements from this construction were obtained from the finite difference modeling. Three-dimensional numerical modeling was used in order to evaluate the foundation settlements since numerical modeling can better estimate the induced stresses and deformations of subsurface soils for complicated geometry, loading history, and for locations outside of the loaded area. During and after construction of the embankments, foundation soil settlement was measured for the lightweight embankments. Settlement estimates from traditional engineering methods and the FLAC3D analyses were compared to the observed settlement data. Sensitive buried utilities were successfully protected by use of lightweight fills, and engineering settlement estimates were shown to agree well with measured settlement data. This case history shows how urban highway re-construction on soft soils, which will likely become more common in the future, can be designed and constructed to reliably protect existing structures.