Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

This paper presents a case study of liquefaction potential assessment carried out under an earth dam foundation in Tunisia. An emphasis was made on the exploration of geotechnical conditions and the interpretation of field tests results collected before and after soil densification using the vibrocompaction technique. The assessment of soil liquefaction susceptibility was made using deterministic and probabilistic simplified procedures developed from several case histories. Conclusively, the obtained results show that before vibrocompaction the soil was prone to the liquefaction hazard. However, after vibrocompaction, a significant improvement of the soil resistance reduces the liquefaction potential of the sandy foundation. Indeed, before vibrocompaction, the factor of safety (FS) drops below 1 which means that the soil is susceptible for liquefaction. However, after vibrocompaction, the values of FS exceed the unit which justify the absence of liquefaction hazard in the dam foundation. In addition, before soil densification, the liquefaction evaluation using CPT-data shows probabilities values over 65 % which correspond to the classes of ‘’very likely’’ and ‘’Almost certain that will be liquefy’’ in the field case histories classification. The treated site presents low probability of liquefaction (less than 35%) indicating a low likelihood of liquefaction of the dam foundation.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Apr 29th, 12:00 AM May 4th, 12:00 AM

Evaluation of Liquefaction Potential of an Earth Dam Foundation Using In Situ Tests

Chicago, Illinois

This paper presents a case study of liquefaction potential assessment carried out under an earth dam foundation in Tunisia. An emphasis was made on the exploration of geotechnical conditions and the interpretation of field tests results collected before and after soil densification using the vibrocompaction technique. The assessment of soil liquefaction susceptibility was made using deterministic and probabilistic simplified procedures developed from several case histories. Conclusively, the obtained results show that before vibrocompaction the soil was prone to the liquefaction hazard. However, after vibrocompaction, a significant improvement of the soil resistance reduces the liquefaction potential of the sandy foundation. Indeed, before vibrocompaction, the factor of safety (FS) drops below 1 which means that the soil is susceptible for liquefaction. However, after vibrocompaction, the values of FS exceed the unit which justify the absence of liquefaction hazard in the dam foundation. In addition, before soil densification, the liquefaction evaluation using CPT-data shows probabilities values over 65 % which correspond to the classes of ‘’very likely’’ and ‘’Almost certain that will be liquefy’’ in the field case histories classification. The treated site presents low probability of liquefaction (less than 35%) indicating a low likelihood of liquefaction of the dam foundation.