Assessing Load Transfer Mechanism in CMC-Supported Embankments Adopting Timoshenko Beam Theory

Publisher:
Ice Virtual Library
Publication Type:
Conference Proceeding
Citation:
Proceedings of XVI European Conference on Soil Mechanics and Geotechnical Engineering, 2015, 1 pp. 577 - 582
Issue Date:
2015-09-17
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Controlled modulus columns (CMC) supported embankments are increasingly being used for construction of major highway embankments on expansive soils particularly near waterways or coastal regions. CMC is a faster, sustainable and economical ground improvement technology that stiffens the poor soil and transmits the load from the traffic to a lower bearing stratum. The key influencing elements of the load transfer mechanism include embankment fill, load transfer platform (LTP) with one or more layers of geosynthetics, CMC and the underlyingneath soils. Rapid growth of the application of geosynthetics between two granular layers in the column-supported embankment was observed in the last two decades. Use of LTP enhances the load distribution mechanism in the CMC improved soft ground and minimises the post construction settlement of the ground. In this paper, reinforced Timoshenko beam theory is introduced to simulate the LTP with one layer of geosynthetics resting on CMC improved soft soil. A parametric study is conducted to investigate the importance of the height of the embankment on the maximum settlement of the LTP, tension developed in the geosynthetics and stress concentration ratio (the ratio of the stresses acting on CMC and soft soils) for the CMC supported embankments. Special attention is given to the stiffness of soft soil and shear stiffness of the geosynthetic layer. It has been observed that height of the embankment, the stiffness of the soft soil and the shear stiffness of the geosynthetics significantly influence the maximum settlement of the LTP and the stress concentration ratio.
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