Creeping (secondary/tertiary settlements) of highly compressible soils and sludge

• Main Author: Brandl H.
• Format: Article
• Language: English
• Published: Society for Materials and Structures testing of Serbia 2018-01-01
• Series: Građevinski Materijali i Konstrukcije
• Subjects: long-term settlements; creeping; highly compressible soils; oedometer tests; heavy tamping; deep soil improvement; sludge
• Online Access: https://scindeks-clanci.ceon.rs/data/pdf/2217-8139/2018/2217-81391801027B.pdf

The paper focuses on long-term oedometer tests lasting up to 42 years and performed on silty sand, (organic) clayey silt, peat and (pre-treated) sewage sludge. Secondary consolidation (creep) could be observed in all cases, lasting over many years and occurring widely linear with the logarithm of time. This long-term phase is followed by tertiary creep with a long lasting fading out period. In addition to the laboratory tests results of comprehensive field observations are summarized, showing the influence of ground improvement on the creeping behaviour of very soft fine-grained soils (partly organic). The data were collected from a highway junction on highly compressible, heterogeneous ground (with natural water content up to 100%), constructed between 1972 and 1974, and monitored since.