Thesis
Numerical and experimental study of the performance of deep cement stabilized soils
Washington State University
Master of Science (MS), Washington State University
2015
Handle:
https://hdl.handle.net/2376/100768
Abstract
This study explores the performance of deep cement stabilized soils based on local (Elocal) to end-platen (Eframe) modulus ratios measured in the laboratory. The research examined (1) whether modern measuring techniques for deep cement mixed (DCM) soil moduli underestimate Young's modulus, which would result in overdesigned projects, and (2) the significance of implementing one modulus value over another, especially from a contractor's design-build standpoint. The questions that were raised at the Deep Foundation Institute soil mixing seminar in 2013 regarding the strength and modulus properties of DCM soils and the most appropriate laboratory procedures for determining these values are the reasons this project was undertaken. Laboratory-prepared DCM soil specimens were mixed and tested using unconfined compressive strength tests, and Young's modulus values were determined from displacements measured locally on the specimen and from the end-platens. It was expected that the Elocal to Eframe ratios would range between 3 and 5 for both clayey and sandy soils. Contrary to expectations, the results showed that the Elocal to Eframe ratio averages were around 5 for clayey soils and 18 for sandy soils. The obtained Elocal to Eframe ratios were applied to an embankment case study published by Yapage et al. (2013) to examine the significance of using one modulus value over another, with the help of the finite element numerical analysis program Abaqus. Based on the numerical analysis results, not much difference in settlement was evident regardless of which Elocal to Eframe ratio was used, as long as the area replacement ratio was between 0 and 0.2. 0 to 0.2 is the minimum area replacement ratio range in which the Elocal to Eframe ratio used in the analysis did not significantly affect the settlement results. Beyond this range, the Elocal to Eframe ratio needs to be considered.
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Details
- Title
- Numerical and experimental study of the performance of deep cement stabilized soils
- Creators
- Elly Mukungu Bulega
- Contributors
- Balasingam Muhunthan (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525060901842
- Language
- English
- Resource Type
- Thesis