Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Fault rupture propagation in free fields lays the ground for an understanding of bedrock-soil-structure interactions. Propagation behaviors in dry soil have long been investigated. Localized shear bands have been identified to be the obvious source of failure in dry soils at depth. In addition, numerous subsurface fractures have been found in the field. However, the influence of subsurface fractures in the soil on future seismic faults has received little attention, especially in complex soils. In this study, three centrifuge tests were conducted to investigate the influence of pre-existing fractures on ground deformations in three multilayered soils: three-layered, five-layered and nine-layered soils. The pre-existing fractures in these tests started from the bedrock fault line and tilted with a dip slip angle of 70° with respect to the horizontal plane. In this paper, both of the ground surface settlement and the bedrock fault movements are presented. Post test examination of the cracks on model surface are also described and compared to studies that did not consider the influence of pre-existing fractures.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Centrifuge Modeling of the Influence of Pre-Existing Fractures in Multilayered Soils on Ground Deformations

San Diego, California

Fault rupture propagation in free fields lays the ground for an understanding of bedrock-soil-structure interactions. Propagation behaviors in dry soil have long been investigated. Localized shear bands have been identified to be the obvious source of failure in dry soils at depth. In addition, numerous subsurface fractures have been found in the field. However, the influence of subsurface fractures in the soil on future seismic faults has received little attention, especially in complex soils. In this study, three centrifuge tests were conducted to investigate the influence of pre-existing fractures on ground deformations in three multilayered soils: three-layered, five-layered and nine-layered soils. The pre-existing fractures in these tests started from the bedrock fault line and tilted with a dip slip angle of 70° with respect to the horizontal plane. In this paper, both of the ground surface settlement and the bedrock fault movements are presented. Post test examination of the cracks on model surface are also described and compared to studies that did not consider the influence of pre-existing fractures.