Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

The performance of pipeline systems under seismic loading is an important consideration in regions subject to earthquakes. Experience from previous seismic events indicates that earthquake-induced permanent ground displacements are one of the key geotechnical hazards to pipelines. This paper briefly describes an evaluation of the vulnerability of a natural gas transmission system to seismic hazards, along with some of the remedial treatments that were implemented. The work was carried out for BC Gas Utility Ltd. in the Lower Mainland of British Columbia, Canada. Initially, a regional study was carried out to identify components of the gas pipeline system that are seismically most vulnerable. Following the regional study, the most vulnerable sites were identified for detailed site-specific analyses with the objective of developing remedial treatment alternatives. Two case histories are described to illustrate some of the options available for seismic upgrading of pipeline systems. The first case history describes a project where ground densification by vibro-replacement was used to reduce the risk of ground deformations at an existing gate station. The second case history describes a project where a new pipeline was installed using the method of horizontal directional drilling (HDD) to avoid potentially liquefiable zones.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Seismic Evaluation and Retrofit of a Major Natural Gas Transmission System

San Diego, California

The performance of pipeline systems under seismic loading is an important consideration in regions subject to earthquakes. Experience from previous seismic events indicates that earthquake-induced permanent ground displacements are one of the key geotechnical hazards to pipelines. This paper briefly describes an evaluation of the vulnerability of a natural gas transmission system to seismic hazards, along with some of the remedial treatments that were implemented. The work was carried out for BC Gas Utility Ltd. in the Lower Mainland of British Columbia, Canada. Initially, a regional study was carried out to identify components of the gas pipeline system that are seismically most vulnerable. Following the regional study, the most vulnerable sites were identified for detailed site-specific analyses with the objective of developing remedial treatment alternatives. Two case histories are described to illustrate some of the options available for seismic upgrading of pipeline systems. The first case history describes a project where ground densification by vibro-replacement was used to reduce the risk of ground deformations at an existing gate station. The second case history describes a project where a new pipeline was installed using the method of horizontal directional drilling (HDD) to avoid potentially liquefiable zones.