Evaluation of Constraint Modulus of Clay Layers Beneath a Test Embankment

Date

2025-11-13

Author

Çokça, Erdal
Güner, Çağlar

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The article presents a method to determine the clay oedometric (constraint) modulus M (Eoed) based on settlement and pore water pressure measurement of the test embankment load, This study presents an evaluation of field measurement data from a test embankment, constructed on a soil profile improved with deep soil mixing columns (DSM), to determine the oedometric deformation moduli M of underlying clay layers. The soil improvement by DSM, extending to a depth of 15m was implemented to mitigate liquefaction risks. This depth of improvement dictated the subsequent behavior of deeper soil strata. The research revealed that the soil profile consisted of interbedded sandy and clayey alluvial deposits down to the improved depth, transitioning to a more homogeneous geological structure at greater depths. The test embankment was designed to simulate realistic behavior under project structures. Prefabricated vertical drains (PVDs) were installed to accelerate consolidation. Pore pressure was recorded using piezometers and settlement measurements using magnetic extensometers, and settlement plates. Oedometric deformation modulus M obtained using correlations and oedometric modulus M derived from in-situ compression and pore water pressures are presented. Determining clay oedometric modulus M from the settlement and piezometer results of the clay soil under the test embankment gives more precise results than correlations.

URI

https://hdl.handle.net/11511/116687

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Department of Civil Engineering, Conference / Seminar