PERFORMANCE AND LOAD DISTRIBUTION IN LIME-CEMENT STABILIZED SOIL AS SUPPORT FOR DEEP SUPPORTED EXCAVATION IN MARINE CLAY-PPT Presentation

PPT Presentation

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The presentation examines the performance and load distribution of lime-cement (LC) stabilized soil used to support a deep excavation in marine clay in Oslo, Norway. The site is constrained by nearby buildings, a pile-supported pedestrian bridge, and a heavily trafficked road. Ground conditions include fill over clay, with sensitive quick clay encountered at approximately 7–8 m depth.<br /><br />The work forms part of SP CURIOUS, a research initiative focused on more sustainable design and construction of deep urban excavations. The excavation was completed in multiple stages and extensively instrumented to monitor ground and LC-panel movements. Norwegian design practice estimates the characteristic strength of stabilized soil using a weighted average of the stabilized material and surrounding soil strengths, accounting for the proportion of soil that is stabilized.<br /><br />Numerical simulations of the staged excavation were conducted using PLAXIS 2D and PLAXIS 3D. The models’ predicted displacements and load distribution were compared with instrumentation data, including measurements within LC panels and in the untreated soil between panels.<br /><br />Measurements showed different horizontal displacements in the stabilized panels and the intervening untreated soil. This suggests that the panels and surrounding soil do not interact fully. The comparison also indicated that PLAXIS 3D represents load distribution in the LC panels more accurately than the 2D model.<br /><br />Overall, the study highlights the value of detailed instrumentation and three-dimensional modelling when assessing the behavior of LC-stabilized ground supporting deep excavations.

Keywords

lime-cement stabilized soil

deep excavation

marine clay

Oslo Norway

quick clay

staged excavation

PLAXIS 2D

PLAXIS 3D

load distribution

instrumentation monitoring