It is a proven fact that, the basal reinforced embankments are stable than unreinforced embankmen... more It is a proven fact that, the basal reinforced embankments are stable than unreinforced embankments on soft soils. The basic principle of reinforcement in the embankment is to reduce the intensity of stress on the foundation. This paper presents the stability of an basal reinforced embankment on soft ground. The parametric studies are carried out by varying fill and ground properties, depth of limiting tangent. It is observed that for a given fill, while the Fs decreases with increasing ground thickness, the mobilized reinforcement force initially increases with increasing depth of limiting tangent.
Infrastructure and industrialization serves as a back bone for a country's economy. However d... more Infrastructure and industrialization serves as a back bone for a country's economy. However due to rapid industrialization there exist a problem in the form of waste accumulation and subsequent problems due to their disposal & effects of waste. In infrastructure development, roads play a major role. In general pavement construction needs bulk quantities of good soil keeping in view of the service and longevity aspects. Due to limitation in availability of good soil, often the cost of projects escalates. An ideal solution lies for reducing project cost, increasing longevity and reduce accumulation of waste shall be through utilization of industrial waste combined with weak soil for pavement construction. Few types of waste materials namely crusher dust, fly ash and Steel slag waste are popular as admixtures in improving weak soils. This paper discusses the performance of admixtures in improving weak soil through mechanical stabilization. Results of tests on index and engineering ...
Usually the service life of pavement on weaker clayey subgrade is affected due to their high plas... more Usually the service life of pavement on weaker clayey subgrade is affected due to their high plasticity and compressibility behaviour. These soils possess low strength, CBR value and have high affinity to moisture. Hence seasonal changes affect properties of these soils adversely. Stabilization techniques using waste materials are listed in literature for improving properties of these types of soft subgrades. This paper discusses the performance of stabilized soft clayey soil for suitability as subgrade using two types of admixtures Robo sand and fly ash. Dynamic cone penetration test and CBR tests are carried out in lab and field on composite soil with varying admixture content and the results are presented. It is observed that there is a considerable improvement with admixture in both index & engineering properties. A reduction in plasticity and improvement in soaked CBR with admixture is observed. Results indicated a relatively high performance of robo sand admixture over fly ash.
Subgrade soil and its properties are very important in the design of road pavement structure. The... more Subgrade soil and its properties are very important in the design of road pavement structure. The subgrade function is to give adequate support to the pavement from beneath. The strength of week subgrade need to be enhanced from longevity perspective Reinforcing weaker soils using geo-synthetics like geo-grids to improve its strength is popular in many civil engineering projects namely, highway pavements, air field construction etc. Recently geogrid has gained increasing acceptance in road construction. The geogrid improves the ability to obtain compaction in overlying aggregates, while reducing the amount of material required be removing and replacing. In the present study engineering performance for soil subgrades reinforced with different types of geogrids varying in aperture sizes. Laboratory tests are conducted on the reinforced subgrades. The lab tests include index & engineering properties.Soaked and unsoaked CBR tests are carried out on unreinforced and reinforced samples. T...
This paper presents a detailed field study of a soft clayey silt stratum improved in situ with pr... more This paper presents a detailed field study of a soft clayey silt stratum improved in situ with preloading combined with prefabricated vertical band drains (PVDs). The clayey silt stratum was to sup...
Stability of embankments on soft soils can be enhanced by providing basal reinforcement with geos... more Stability of embankments on soft soils can be enhanced by providing basal reinforcement with geosynthetics, as suggested by many authors in the past. At failure, due to weight of sliding mass geosynthetic reinforcement will be subjected to pull. Many authors analyzed the problem by considering only horizontal/axial pull of reinforcement with full mobilization of frictional stresses. The geosynthetics reinforcement selected should withstand higher order tensile stresses to avoid rupture. Many authors in the past concluded that the tensile forces developed in reinforcement are function of fill properties, fill geometry and fill-reinforcement interface properties and strain in reinforcement. The strain in reinforcement can be influenced due to several parameters like failure condition of embankment either in collapse or in working condition and stiffness of soil etc. This paper presents stability analysis of basal reinforced embankments constructed on soils whose strength increases wit...
It is a proven fact that, the basal reinforced embankments are stable than unreinforced embankmen... more It is a proven fact that, the basal reinforced embankments are stable than unreinforced embankments on soft soils. The basic principle of reinforcement in the embankment is to reduce the intensity of stress on the foundation. This paper presents the stability of an basal reinforced embankment on soft ground. The parametric studies are carried out by varying fill and ground properties, depth of limiting tangent. It is observed that for a given fill, while the Fs decreases with increasing ground thickness, the mobilized reinforcement force initially increases with increasing depth of limiting tangent.
Infrastructure and industrialization serves as a back bone for a country's economy. However d... more Infrastructure and industrialization serves as a back bone for a country's economy. However due to rapid industrialization there exist a problem in the form of waste accumulation and subsequent problems due to their disposal & effects of waste. In infrastructure development, roads play a major role. In general pavement construction needs bulk quantities of good soil keeping in view of the service and longevity aspects. Due to limitation in availability of good soil, often the cost of projects escalates. An ideal solution lies for reducing project cost, increasing longevity and reduce accumulation of waste shall be through utilization of industrial waste combined with weak soil for pavement construction. Few types of waste materials namely crusher dust, fly ash and Steel slag waste are popular as admixtures in improving weak soils. This paper discusses the performance of admixtures in improving weak soil through mechanical stabilization. Results of tests on index and engineering ...
Usually the service life of pavement on weaker clayey subgrade is affected due to their high plas... more Usually the service life of pavement on weaker clayey subgrade is affected due to their high plasticity and compressibility behaviour. These soils possess low strength, CBR value and have high affinity to moisture. Hence seasonal changes affect properties of these soils adversely. Stabilization techniques using waste materials are listed in literature for improving properties of these types of soft subgrades. This paper discusses the performance of stabilized soft clayey soil for suitability as subgrade using two types of admixtures Robo sand and fly ash. Dynamic cone penetration test and CBR tests are carried out in lab and field on composite soil with varying admixture content and the results are presented. It is observed that there is a considerable improvement with admixture in both index & engineering properties. A reduction in plasticity and improvement in soaked CBR with admixture is observed. Results indicated a relatively high performance of robo sand admixture over fly ash.
Subgrade soil and its properties are very important in the design of road pavement structure. The... more Subgrade soil and its properties are very important in the design of road pavement structure. The subgrade function is to give adequate support to the pavement from beneath. The strength of week subgrade need to be enhanced from longevity perspective Reinforcing weaker soils using geo-synthetics like geo-grids to improve its strength is popular in many civil engineering projects namely, highway pavements, air field construction etc. Recently geogrid has gained increasing acceptance in road construction. The geogrid improves the ability to obtain compaction in overlying aggregates, while reducing the amount of material required be removing and replacing. In the present study engineering performance for soil subgrades reinforced with different types of geogrids varying in aperture sizes. Laboratory tests are conducted on the reinforced subgrades. The lab tests include index & engineering properties.Soaked and unsoaked CBR tests are carried out on unreinforced and reinforced samples. T...
This paper presents a detailed field study of a soft clayey silt stratum improved in situ with pr... more This paper presents a detailed field study of a soft clayey silt stratum improved in situ with preloading combined with prefabricated vertical band drains (PVDs). The clayey silt stratum was to sup...
Stability of embankments on soft soils can be enhanced by providing basal reinforcement with geos... more Stability of embankments on soft soils can be enhanced by providing basal reinforcement with geosynthetics, as suggested by many authors in the past. At failure, due to weight of sliding mass geosynthetic reinforcement will be subjected to pull. Many authors analyzed the problem by considering only horizontal/axial pull of reinforcement with full mobilization of frictional stresses. The geosynthetics reinforcement selected should withstand higher order tensile stresses to avoid rupture. Many authors in the past concluded that the tensile forces developed in reinforcement are function of fill properties, fill geometry and fill-reinforcement interface properties and strain in reinforcement. The strain in reinforcement can be influenced due to several parameters like failure condition of embankment either in collapse or in working condition and stiffness of soil etc. This paper presents stability analysis of basal reinforced embankments constructed on soils whose strength increases wit...
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