#### Location

St. Louis, Missouri

#### Session Start Date

3-11-1991

#### Session End Date

3-15-1991

#### Abstract

For buried structures, such as conduits and underground pipes, liquefaction induced forces will depend on the volume of soil surrounding the structure that will liquefy. Here, a methodology to calculate the probability of the onset of liquefaction at a given depth in a soil deposit is extended to assess the probability that a specified volume of soil will liquefy when liquefaction occurs at a given depth in the deposit. To account for the variability of soil properties with depth, the soil deposit is divided into horizontal layers and the volume of liquefied soil in each layer is calculated as the product of the layer thickness by the lateral extent of liquefaction. Within each layer, the horizontal variability of the soil properties is described by a homogeneous and axisymmetric random field. It is assumed that the ground motions in the horizontal direction are perfectly correlated. The results are presented in terms of the probability of liquefaction spreading over a given area (a circle of radius R) as a function of the intensity of the ground motion.

#### Department(s)

Civil, Architectural and Environmental Engineering

#### Appears In

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

#### Meeting Name

Second Conference

#### Publisher

University of Missouri--Rolla

#### Publication Date

3-11-1991

#### Document Version

Final Version

#### Rights

© 1991 University of Missouri--Rolla, All rights reserved.

#### Document Type

Article - Conference proceedings

#### File Type

text

#### Language

English

#### Recommended Citation

Pires, Jose A.; Ang, A. H.-S.; and Katayama, I., "Liquefaction Fragilities for Buried Lifelines" (1991). *International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics*. 31.

http://scholarsmine.mst.edu/icrageesd/02icrageesd/session03/31

Liquefaction Fragilities for Buried Lifelines

St. Louis, Missouri

For buried structures, such as conduits and underground pipes, liquefaction induced forces will depend on the volume of soil surrounding the structure that will liquefy. Here, a methodology to calculate the probability of the onset of liquefaction at a given depth in a soil deposit is extended to assess the probability that a specified volume of soil will liquefy when liquefaction occurs at a given depth in the deposit. To account for the variability of soil properties with depth, the soil deposit is divided into horizontal layers and the volume of liquefied soil in each layer is calculated as the product of the layer thickness by the lateral extent of liquefaction. Within each layer, the horizontal variability of the soil properties is described by a homogeneous and axisymmetric random field. It is assumed that the ground motions in the horizontal direction are perfectly correlated. The results are presented in terms of the probability of liquefaction spreading over a given area (a circle of radius R) as a function of the intensity of the ground motion.