Effect of Synthetic Geotextile on Stabilization of Expansive Subgrades: Experimental Study
- 1 October 2021
- journal article
- research article
- Published by American Society of Civil Engineers (ASCE) in Journal of Materials in Civil Engineering
- Vol. 33 (10), 04021273
- https://doi.org/10.1061/(asce)mt.1943-5533.0003901
Abstract
Structures constructed on expansive soils experience higher upward pressure due to their swelling characteristics. Various conventional treatment methods developed to counteract swell–shrink characteristics of expansive soil are deemed time consuming and not feasible for use in pavement. Geotextiles (GTs) have been used as a filtration and separation medium; however, their effect on swell pressure and shear strength of expansive soil has not been well explored. This study aimed to address these issues by using GT to control swelling behavior, drain moisture content, and provide support at the soil interface. Swell pressure and shear strength were quantified by constant volume swell pressure and direct shear and unconfined compressive strength tests, respectively. The influence of single-layer, double-layer, and triple-layer GTs at varying depths was studied. The higher tensile strength of the GT layer restrained the swell pressure mobilized by resisting internal soil movements and facilitating in-plane drainage conditions. Additionally, soil–geotextile interfacial interactions were observed to contribute to improvement in shear strength. Comprehensive statistical analysis using one-way analysis of variance (ANOVA) was carried out on swell and strength properties. The present study ascertained the use of GT for the dual function (i.e., strength and swell control) of stabilizing expansive subgrades.Keywords
This publication has 63 references indexed in Scilit:
- Effects of geosynthetics on reduction of reflection cracking in asphalt overlaysGeotextiles and Geomembranes, 2009
- Stability analysis of slopes using the finite element method and limiting equilibrium approachBulletin of Engineering Geology and the Environment, 2008
- Comprehensive Field Studies to Address the Performance of Stabilized Expansive ClaysTransportation Research Record: Journal of the Transportation Research Board, 2007
- Ranking of Four Chemical and Mechanical Stabilization Methods to Treat Low-Volume Road Subgrades in TexasTransportation Research Record: Journal of the Transportation Research Board, 2003
- Experimental evaluations of stabilisation methods for sulphate-rich expansive soilsProceedings of the Institution of Civil Engineers - Ground Improvement, 2003
- Feasibility of Geosynthetic Inclusion for Reducing Swelling of Expansive SoilsTransportation Research Record: Journal of the Transportation Research Board, 2002
- Centrifugal and numerical modelling of reinforced embankments on soft clay installed with wick drainsGeotextiles and Geomembranes, 2001
- Effects of Fiber Reinforcement on Strength and Volume Change in Expansive SoilsTransportation Research Record: Journal of the Transportation Research Board, 2000
- Results of direct shear tests on geotextile reinforced cohesive soilGeotextiles and Geomembranes, 1996
- Performance of geotextile-reinforced clay samples in undrained triaxial testsGeotextiles and Geomembranes, 1986