Journal Published Online: 01 September 1998
Volume 26, Issue 5

Role of Filter Paper Separators on the Response of Clays Under Long-Duration Sustained Loading



In a one-dimensional consolidation test, a sustained load duration in excess of 104 min is rarely used for evaluation of the coefficient of secondary compression even for very plastic clays. However, there are instances in the literature where load durations have exceeded 105 min. The clogging of porous stones by migration of soil fines is conventionally prevented by interposing filter paper separators between the porous stones and the soil specimen. The present study examines the effect of filter paper separators on the secondary compression and swelling characteristics of a bentonite-sand mixture. In longterm volume change tests, use of filter paper separators results in increased deformation when the soil is undergoing drained creep in consolidation tests. When the soil undergoes swelling over a long period of time, some collapse occurs due to the decay of the filter paper separators. The observations of a long-duration drained creep test on this soil are used to explain the reported secondary compression behavior of some natural soils. The results of the study bring out the need to develop nondegradable separators for long-duration tests to protect porous stones from clogging with soil fines.

Author Information

Robinson, RG
Indian Institute of Science, Bangalore, India
Allam, MM
Indian Institute of Science, Bangalore, India
Pages: 4
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: JTE12027J
ISSN: 0090-3973
DOI: 10.1520/JTE12027J