Location

St. Louis, Missouri

Session Start Date

3-11-1991

Session End Date

3-15-1991

Abstract

This paper evaluates the performance of landfill slopes (refuse fill slopes) during strong ground motion from the October 17, 1989 Loma Prieta Earthquake (M7.1) that affected the Santa Cruz Mountains - San Francisco Bay region. The earthquake's occurrence in a highly populated area that contains the waste disposal sites for this large population offered a unique opportunity to review the performance of slopes on the landfills. Current state and federal regulations require the analysis of stability of landfills under seismic loading. To date, these evaluations have relied on gross simplified assumptions. This paper examines whether these assumptions are reasonably correct. There are approximately 35 active landfills in the seven counties surrounding the epicentral area. The landfills are underlain by a variety of geologic materials ranging from Bay Mud (soft sediments) to hard rock. Fill slopes at the landfills range from a few feet to 250 feet high with inclinations as steep as 2:1 (horizontal to vertical). Contact with operators and regulatory agencies indicate that there was very little damage to landfill slopes during the earthquake. The probable ground accelerations at the landfills during the earthquake are estimated based on comparison with accelerations recorded at nearby CSMIP stations or USGS strong motion stations and the site geologic conditions.

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

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Investigation of Sanitary Landfill Slope Performance During Strong Ground Motion from the Loma Prieta Earthquake of October 17, 1989

St. Louis, Missouri

This paper evaluates the performance of landfill slopes (refuse fill slopes) during strong ground motion from the October 17, 1989 Loma Prieta Earthquake (M7.1) that affected the Santa Cruz Mountains - San Francisco Bay region. The earthquake's occurrence in a highly populated area that contains the waste disposal sites for this large population offered a unique opportunity to review the performance of slopes on the landfills. Current state and federal regulations require the analysis of stability of landfills under seismic loading. To date, these evaluations have relied on gross simplified assumptions. This paper examines whether these assumptions are reasonably correct. There are approximately 35 active landfills in the seven counties surrounding the epicentral area. The landfills are underlain by a variety of geologic materials ranging from Bay Mud (soft sediments) to hard rock. Fill slopes at the landfills range from a few feet to 250 feet high with inclinations as steep as 2:1 (horizontal to vertical). Contact with operators and regulatory agencies indicate that there was very little damage to landfill slopes during the earthquake. The probable ground accelerations at the landfills during the earthquake are estimated based on comparison with accelerations recorded at nearby CSMIP stations or USGS strong motion stations and the site geologic conditions.