Location

St. Louis, Missouri

Session Start Date

3-11-1991

Session End Date

3-15-1991

Abstract

The displacements and rates of displacement of slopes post-rupture are influenced by the dynamic response of soils. Pre-existing shear surfaces at or close to residual strength are frequently present in slopes of clay and weak mudstone, due to previous slope movement or tectonic disturbance. Knowledge of the strength of such surfaces under rapid loading is necessary of stability during and after an earthquake is to be examined. To obtain such data, high speed displacement controlled ring shear tests have been performed, on samples after being pre-sheared to residual conditions. With the results from those tests, suitable constitutive laws were derived for the soils and numerical analysis were made of an old landslide submitted to dynamic earthquake loading. Analysis were also performed for first landslides, on plastic clays, in order to calculate the maximum velocity, displacement and duration of sliding. The calculation is based on the assumption that the whole moving mass is displaced as a single rigid body with resistance mobilised along the sliding surface. Newmark's sJjding block was used, sliding on a nonlinear surface involving a resistance dependent on factors such as displacement and rate of slip.

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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Mar 11th, 12:00 AM Mar 15th, 12:00 AM

Displacements of Slopes Under Earthquake Loading

St. Louis, Missouri

The displacements and rates of displacement of slopes post-rupture are influenced by the dynamic response of soils. Pre-existing shear surfaces at or close to residual strength are frequently present in slopes of clay and weak mudstone, due to previous slope movement or tectonic disturbance. Knowledge of the strength of such surfaces under rapid loading is necessary of stability during and after an earthquake is to be examined. To obtain such data, high speed displacement controlled ring shear tests have been performed, on samples after being pre-sheared to residual conditions. With the results from those tests, suitable constitutive laws were derived for the soils and numerical analysis were made of an old landslide submitted to dynamic earthquake loading. Analysis were also performed for first landslides, on plastic clays, in order to calculate the maximum velocity, displacement and duration of sliding. The calculation is based on the assumption that the whole moving mass is displaced as a single rigid body with resistance mobilised along the sliding surface. Newmark's sJjding block was used, sliding on a nonlinear surface involving a resistance dependent on factors such as displacement and rate of slip.