II. PAVEMENT ENGINEERING AND PAVING MATERIALS

1. SOIL STABILISATION, LOW GRADE MATERIALS AND LOW VOLUME ROADS

B. NEW PROJECTS
1. Ground Stabilization Techniques for Road Construction in Clayey Soils of Kuttanadu Region
Duration:

April 2005 to March- 2006 National Transportation Planning and Research Centre (NATPAC),
Thiruvananthapuram (R)

 

Scope and Objectives
The scope of the study is to analyse various methods of stabilizing clay in the road embankments of Kuttanadu. The objectives are to analyse the engineering properties of clayey soils in Kuttanadu region, study the effect of ground improvement technologies such as sand drains, geotextile drains and to study the field performance of coir reinforced small clay embankments under wet and dry conditions.
 
Methodology
The laboratory studies include basic engineering properties of coir geotextile, model studies on coir geotextile and preconsolidation using sand drains and geotextile drains. Field studies are conducted for coir reinforced clay dykes and side stopes.
 
Interim Conclusions
Clayey soil of Kuttanadu in general has a plasticity index of 38.9% with 30% silt and 70% clay and belongs to the class of silts and clays of high compressibility. The permeability in 2.83 x 10-7 cm /sec, Unconfined compressive strength is 0.189 Kg/cm2 and Co-eff of consolidation is 5.87x10-3-3 cm2/sec. When tested with coir fibre called, Texsol, the UCC value is 0.386 Kg/cm2, thus increasing the comprehensive strength by 104%.
 
Significance/Utilisation Potential
The study gives an insight in to the behaviour of clayey soils of Kuttanadu under alternate wetting and drying conditions and is relevant for the construction of roads in the area.
 
Recommendations for further work
The study can be extended with newer methods of ground improvements.