Study on River Bed Material and Numerical Analysis of Stabilized Road Embankment on Soft Soil
The experimental study has been carried out to evaluate the effectiveness of stabilization of the river Brahmaputra bed materials with varying percentages of Portland cement. Numerical modeling has been done to study the suitability of the stabilized river bed material with respect to strength and settlement. The Brahmaputra River Bed materials were stabilized with Portland cement with varying percentages (2, 4, and 6%) cured for 7, 14, 28, 45, and 90 days. The samples were cured in a humidity control chamber at temperature 30 ± 1 °C and humidity 95 ± 1%. The mechanical behavior of this potential new material was assessed by a series of tests, including unconsolidated undrained triaxial tests on samples with different percentages of cement. It is revealed from the results that the stabilized bed materials are suitable for use in subgrade of the embankment of the low volume roads as per relevant standards. To investigate the performance of an embankment constructed using the proposed material, a numerical analysis was undertaken using the software Plaxis with the properties obtained for an embankment fill material (i.e., cement stabilized and unstabilized soil). The highway embankment has been consisting of four layers, the bottom two layers represent natural soft subgrade and the top two layers represent the embankment fill with stabilized river bed materials. In the present paper filling material has been considered as an elasto-plastic material. Plastic behavior of the filling material has been defined by Mohr–Coulomb plasticity model and the input parameter for numerical analysis has been obtained from laboratory experiments.
KeywordsEmbankment Plaxis Modulus of elasticity Stabilized soil
I acknowledge my gratefulness to Department of Science and Technology, Ministry of Science and Technology, Govt. of India for financial support vide Reference No. SR/WOS-A/ET-21/2017 (G) and (C) under Kiran Division for women in Science “Women Scientist Scheme–A”.
- 2.Das C, Ghosh A (2017) Shear strength behaviour and regression analysis of cement stabilized river bed material for use in subgrade. In: Indian geotechnical conference 2017 GeoNEst, 14–16 Dec 2017, IIT Guwahati, IndiaGoogle Scholar
- 3.Ghosh A (2010) Compaction characteristics and bearing ratio of pond ash stabilized with lime and phosphogypsum. J Mater Civil Eng ASCE 344. https://doi.org/10.1061/(asce)mt.1943-5533.0000028CrossRefGoogle Scholar
- 5.Plaxis Reference Manual (2006) Plaxis BV. Delft, The NetherlandsGoogle Scholar
- 6.Das BM (2006) Principles of geotechnical engineering. Brooks/Cole Pub Co. 589 p.Google Scholar
- 7.Oh SW, Lee JK, Kwon YC (2002) Bearing Capacity of Light Weight Soil using Recycled Styrofoam Beads. Proceedings of The Twelfth (2002) International Offshore and Polar Engineering Conference, Kitakyushu, Japan, 26–31 May 2002. Copyright © 2002 by the International Society of Offshore and Polar Engineers, ISBN 1-880653-58-3 (Set); ISSN 1098-6189 (Set)Google Scholar
- 8.American Society for Testing and Materials (ASTM) (2007) Standard Test Method for Particle-Size Analysis of Soils. Designation D422-63(2007), PhiladelphiaGoogle Scholar
- 9.American Society for Testing and Materials (ASTM) (2005) Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils. Designation D4318-05, PhiladelphiaGoogle Scholar
- 10.American Society for Testing and Materials (ASTM) (2006) Standard test methods for specific gravity of soil solids by water pycnometer. Designation D854-06, PhiladelphiaGoogle Scholar
- 11.American Society for Testing and Materials (ASTM) (2007) Standard test methods for laboratory compaction characteristics of soil using modified effort (2674 kJ/m3). Designation D1557-07, PhiladelphiaGoogle Scholar
- 12.American Society for Testing and Materials (ASTM) (2007) Standard test method for California bearing ratio of laboratory-compacted soils. Designation D1883-07, PhiladelphiaGoogle Scholar
- 13.American Society for Testing and Materials (ASTM) (2007) Standard test methods for unconsolidated undrained triaxial compression test on cohesive soils. Designation D2850-03(2007), PhiladelphiaGoogle Scholar
- 14.BS 8006-2010: Code of practice for strengthened/reinforced soils and other fillsGoogle Scholar