A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cost Economics of Geocell Reinforced Flexible Pavements on Intermediate Compressible Clayey Subgrades
Accessibility and interconnectivity to distinctive places through well-connected transportation network contribute for the socio-economic development of any country. About 40% of surface deposits in India are covered by clayey soils, and inevitably the roads have to pass through such subgrades. In spite of adopting large pavement thickness to prevailing due low soaked CBR values, flexible pavements over clayey soils suffer from immoderate rutting, wavy surface, longitudinal cracking alongside wheel track and shear failure in subgrade in edge regions. Researchers are trying continuously to enhance the strength and stability of the clay subgrades through stabilization, reinforcing, moisture manipulation and soil replacement techniques. The advent of geosynthetics has drawn the interest of highway engineers to contemplate them for use in pavements to enhance performance. Particularly geogrids, geocells and geotextiles due to their multi-functional behaviour have been tried to control reflection cracking in overlays, as separator-filter—drain at clay subgrades, as reinforcing factor in soft-soils. The present study focuses upon geocell confinement of subbase and base layers of flexible pavements over clay subgrade of intermediate compressibility (CI) to reduce pavement thickness. The reduction of thickness of overlying layers of geocell strengthened layer is made by keeping vertical strain below the limiting vertical strain at subgrade level of unreinforced pavement as specified in IRC 37-2012. The designed pavement sections with geocell reinforced base and subbase layers indicated reduction in pavement thickness by about 12% and 24%, respectively, and the cost analysis revealed savings of about 12% and 8% for geocell reinforced base and subbase layer pavement sections for traffic of 50 msa.
Cost Economics of Geocell Reinforced Flexible Pavements on Intermediate Compressible Clayey Subgrades
Accessibility and interconnectivity to distinctive places through well-connected transportation network contribute for the socio-economic development of any country. About 40% of surface deposits in India are covered by clayey soils, and inevitably the roads have to pass through such subgrades. In spite of adopting large pavement thickness to prevailing due low soaked CBR values, flexible pavements over clayey soils suffer from immoderate rutting, wavy surface, longitudinal cracking alongside wheel track and shear failure in subgrade in edge regions. Researchers are trying continuously to enhance the strength and stability of the clay subgrades through stabilization, reinforcing, moisture manipulation and soil replacement techniques. The advent of geosynthetics has drawn the interest of highway engineers to contemplate them for use in pavements to enhance performance. Particularly geogrids, geocells and geotextiles due to their multi-functional behaviour have been tried to control reflection cracking in overlays, as separator-filter—drain at clay subgrades, as reinforcing factor in soft-soils. The present study focuses upon geocell confinement of subbase and base layers of flexible pavements over clay subgrade of intermediate compressibility (CI) to reduce pavement thickness. The reduction of thickness of overlying layers of geocell strengthened layer is made by keeping vertical strain below the limiting vertical strain at subgrade level of unreinforced pavement as specified in IRC 37-2012. The designed pavement sections with geocell reinforced base and subbase layers indicated reduction in pavement thickness by about 12% and 24%, respectively, and the cost analysis revealed savings of about 12% and 8% for geocell reinforced base and subbase layer pavement sections for traffic of 50 msa.
Cost Economics of Geocell Reinforced Flexible Pavements on Intermediate Compressible Clayey Subgrades
Lecture Notes in Civil Engineering
Satyanarayana Reddy, C. N. V. (editor) / Saride, Sireesh (editor) / Haldar, Sumanta (editor) / Satyanarayana Reddy, C. N. V. (author) / Viswa Teja, T. V. (author) / Vineel, Ch. (author)
2021-08-03
9 pages
Article/Chapter (Book)
Electronic Resource
English
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